Re: [MBZ] AC Overcharged Question!!!
On Sun, May 28, 2023, at 19:52, Jim Cathey via Mercedes wrote: > For the record, _after_ I recharged my W210 I got 53 degrees. > Depending on the car, mid-40's is as good as it gets. My parents had a Toyota Camry that would get cold enough that the air from the vents would create fog in the car if the humidity was high. Sort of the opposite effect of exhaling on a cold winter day. Never measured what the temp was but I've never seen another car do that. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] AC Overcharged Question!!!
> The vents were blowing 45 degrees F so I knew it needed some R134. For the record, _after_ I recharged my W210 I got 53 degrees. Depending on the car, mid-40's is as good as it gets. -- Jim ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] AC Overcharged Question!!!
> Mid 30s would be a really good vent temp in a car. Exceptionally good. All such systems are designed to NOT hit freezing at the evaporator, when working correctly, so as not to clog with ice. I think the best vent temperature I've ever seen, on any car I've worked on and which was working correctly, was 38 degrees F. I had one get an exceptionally low temperature, but it was due to a clogged expansion valve. The temps were ultra-low, but its cooling capacity was also. (Analogous to volts vs amperes.) This was the 250C. I opened the expansion valve and cleaned it out, thereafter it worked correctly. An overfull AC system generally does not over-cool. That's not how it works. The systems are simple mechanically. Not so much, thermodynamically. -- Jim ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] AC Overcharged Question!!!
I’ve had a few cars I’ve gotten down in this range after some tweaking. Mrs. Day used to require a “portal to the Arctic” from center vents, so I did what I could to dial stuff in. Thankfully, these systems have no problem doing it for the most part. -D > On May 28, 2023, at 5:21 PM, Allan Streib via Mercedes > wrote: > > Mid 30s would be a really good vent temp in a car. > > On Sun, May 28, 2023, at 15:52, Robert Koziak via Mercedes wrote: >> Thanks for the quick replies! I borrowed another digital temperature >> gauge from a neighbor and the readings were consistently between 26 F >> and 36 F at "max cold" when checked at the four vents. I suspect the >> digital Temperature Gauge I had was giving faulty readings too. >> The AC feels great but I was just concerned about an overfill causing >> problems. Tomorrow time to buy new gauges and recheck everything. >> Have a great Memorial Day! >> Bob K >> >> >> -Original Message- >> From: dan penoff.com via Mercedes >> To: Okie Benz >> Cc: dan penoff.com >> Sent: Sun, May 28, 2023 4:26 pm >> Subject: Re: [MBZ] AC Overcharged Question!!! >> >> AC is all about pressures and temperatures. It’s not something you can >> guess at and expect a specific outcome. >> >> And just as an aside, I suspect the 10 degrees comment was an >> embellishment rather than an exact reading. These systems have a low >> temperature cutout that would shut off the compressor if the evaporator >> freezes or temperature gets below a setpoint. >> >> There was a hack for the W126 chassis cars I used to do to mine: >> >> The compressor cutout on these was a mechanical switch connected to a >> capillary tube that was positioned between the evaporator fins in the >> heater box. It’s easy to remove. I think they typically cut out at 40F >> or maybe slightly below that. You could recalibrate them by putting the >> capillary into a glass of crushed ice/water to get it down to near >> freezing. Using a test light or an ohmmeter, you calibrated the switch >> to open at the lower temperature. >> >> Made a big difference in places like Florida, believe me! >> >> -D >> >>> On May 28, 2023, at 3:50 PM, Allan Streib via Mercedes >>> wrote: >>> >>> I don't think a car AC will ever blow as cold as 10 degrees F. How are you >>> measuring these temps? >>> >>> One can is probably not enough to damage anything, but if you're worried >>> don't run the AC until you get a working pressure gauge, ideally a set that >>> measures low and high side pressures. Harbor Freight sells them. >>> >>> https://www.harborfreight.com/r134a-ac-manifold-gauge-set-58776.html >>> >>> You can then compare your readings to a chart such as this one. >>> >>> https://jamcoautoparts.com/systempressuretroubleshootingchart/ >>> >>> >>> On Sun, May 28, 2023, at 14:34, Robert Koziak via Mercedes wrote: >>>> Hi All, >>>> I just went to charge my 2011 Mercedes C300. The vents were >>>> blowing 45 degrees F so I knew it needed some R134. The 134A adapter I >>>> used has a faulty gauge! I used about one can and the vents were >>>> blowing 10 degrees F after I charged the system. Did I overfill the >>>> system and should I let some out? >>>> Don't want to cause damage...help! I will buy a new >>>> gauge tomorrow and check. >>>> Thanks in advance! >>>> Bob K >>> >>> ___ >>> http://www.okiebenz.com >>> >>> To search list archives http://www.okiebenz.com/archive/ >>> >>> To Unsubscribe or change delivery options go to: >>> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >>> >> >> ___ >> http://www.okiebenz.com >> >> To search list archives http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> >> ___ >> http://www.okiebenz.com >> >> To search list archives http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] AC Overcharged Question!!!
Mid 30s would be a really good vent temp in a car. On Sun, May 28, 2023, at 15:52, Robert Koziak via Mercedes wrote: > Thanks for the quick replies! I borrowed another digital temperature > gauge from a neighbor and the readings were consistently between 26 F > and 36 F at "max cold" when checked at the four vents. I suspect the > digital Temperature Gauge I had was giving faulty readings too. > The AC feels great but I was just concerned about an overfill causing > problems. Tomorrow time to buy new gauges and recheck everything. > Have a great Memorial Day! > Bob K > > > -Original Message- > From: dan penoff.com via Mercedes > To: Okie Benz > Cc: dan penoff.com > Sent: Sun, May 28, 2023 4:26 pm > Subject: Re: [MBZ] AC Overcharged Question!!! > > AC is all about pressures and temperatures. It’s not something you can > guess at and expect a specific outcome. > > And just as an aside, I suspect the 10 degrees comment was an > embellishment rather than an exact reading. These systems have a low > temperature cutout that would shut off the compressor if the evaporator > freezes or temperature gets below a setpoint. > > There was a hack for the W126 chassis cars I used to do to mine: > > The compressor cutout on these was a mechanical switch connected to a > capillary tube that was positioned between the evaporator fins in the > heater box. It’s easy to remove. I think they typically cut out at 40F > or maybe slightly below that. You could recalibrate them by putting the > capillary into a glass of crushed ice/water to get it down to near > freezing. Using a test light or an ohmmeter, you calibrated the switch > to open at the lower temperature. > > Made a big difference in places like Florida, believe me! > > -D > >> On May 28, 2023, at 3:50 PM, Allan Streib via Mercedes >> wrote: >> >> I don't think a car AC will ever blow as cold as 10 degrees F. How are you >> measuring these temps? >> >> One can is probably not enough to damage anything, but if you're worried >> don't run the AC until you get a working pressure gauge, ideally a set that >> measures low and high side pressures. Harbor Freight sells them. >> >> https://www.harborfreight.com/r134a-ac-manifold-gauge-set-58776.html >> >> You can then compare your readings to a chart such as this one. >> >> https://jamcoautoparts.com/systempressuretroubleshootingchart/ >> >> >> On Sun, May 28, 2023, at 14:34, Robert Koziak via Mercedes wrote: >>> Hi All, >>> I just went to charge my 2011 Mercedes C300. The vents were >>> blowing 45 degrees F so I knew it needed some R134. The 134A adapter I >>> used has a faulty gauge! I used about one can and the vents were >>> blowing 10 degrees F after I charged the system. Did I overfill the >>> system and should I let some out? >>> Don't want to cause damage...help! I will buy a new >>> gauge tomorrow and check. >>> Thanks in advance! >>> Bob K >> >> ___ >> http://www.okiebenz.com >> >> To search list archives http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> > > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] AC Overcharged Question!!!
Exactly. -D > On May 28, 2023, at 5:07 PM, Allan Streib via Mercedes > wrote: > > Yeah the best way to be sure it's right is to vacuum the system down to > empty, then recharge with the specified amount of refrigerant by weight. This > is what a good AC shop would do. If the system doesn't cool properly after > that, you have other problems. > > Most of us at home probably don't have a refrigerant recovery system and I > personally prefer not to vent the refrigerant into the air, though logically > I know it's not enough to harm anything and technically it is illegal to do > so. So I just look at the pressures and add refrigerant (slowly) until they > look about right. > > > > On Sun, May 28, 2023, at 15:26, dan penoff.com via Mercedes wrote: >> AC is all about pressures and temperatures. It’s not something you can >> guess at and expect a specific outcome. >> >> And just as an aside, I suspect the 10 degrees comment was an >> embellishment rather than an exact reading. These systems have a low >> temperature cutout that would shut off the compressor if the evaporator >> freezes or temperature gets below a setpoint. >> >> There was a hack for the W126 chassis cars I used to do to mine: >> >> The compressor cutout on these was a mechanical switch connected to a >> capillary tube that was positioned between the evaporator fins in the >> heater box. It’s easy to remove. I think they typically cut out at 40F >> or maybe slightly below that. You could recalibrate them by putting the >> capillary into a glass of crushed ice/water to get it down to near >> freezing. Using a test light or an ohmmeter, you calibrated the switch >> to open at the lower temperature. >> >> Made a big difference in places like Florida, believe me! >> >> -D >> >>> On May 28, 2023, at 3:50 PM, Allan Streib via Mercedes >>> wrote: >>> >>> I don't think a car AC will ever blow as cold as 10 degrees F. How are you >>> measuring these temps? >>> >>> One can is probably not enough to damage anything, but if you're worried >>> don't run the AC until you get a working pressure gauge, ideally a set that >>> measures low and high side pressures. Harbor Freight sells them. >>> >>> https://www.harborfreight.com/r134a-ac-manifold-gauge-set-58776.html >>> >>> You can then compare your readings to a chart such as this one. >>> >>> https://jamcoautoparts.com/systempressuretroubleshootingchart/ >>> >>> >>> On Sun, May 28, 2023, at 14:34, Robert Koziak via Mercedes wrote: Hi All, I just went to charge my 2011 Mercedes C300. The vents were blowing 45 degrees F so I knew it needed some R134. The 134A adapter I used has a faulty gauge! I used about one can and the vents were blowing 10 degrees F after I charged the system. Did I overfill the system and should I let some out? Don't want to cause damage...help! I will buy a new gauge tomorrow and check. Thanks in advance! Bob K >>> >>> ___ >>> http://www.okiebenz.com >>> >>> To search list archives http://www.okiebenz.com/archive/ >>> >>> To Unsubscribe or change delivery options go to: >>> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >>> >> >> ___ >> http://www.okiebenz.com >> >> To search list archives http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] AC Overcharged Question!!!
Yeah the best way to be sure it's right is to vacuum the system down to empty, then recharge with the specified amount of refrigerant by weight. This is what a good AC shop would do. If the system doesn't cool properly after that, you have other problems. Most of us at home probably don't have a refrigerant recovery system and I personally prefer not to vent the refrigerant into the air, though logically I know it's not enough to harm anything and technically it is illegal to do so. So I just look at the pressures and add refrigerant (slowly) until they look about right. On Sun, May 28, 2023, at 15:26, dan penoff.com via Mercedes wrote: > AC is all about pressures and temperatures. It’s not something you can > guess at and expect a specific outcome. > > And just as an aside, I suspect the 10 degrees comment was an > embellishment rather than an exact reading. These systems have a low > temperature cutout that would shut off the compressor if the evaporator > freezes or temperature gets below a setpoint. > > There was a hack for the W126 chassis cars I used to do to mine: > > The compressor cutout on these was a mechanical switch connected to a > capillary tube that was positioned between the evaporator fins in the > heater box. It’s easy to remove. I think they typically cut out at 40F > or maybe slightly below that. You could recalibrate them by putting the > capillary into a glass of crushed ice/water to get it down to near > freezing. Using a test light or an ohmmeter, you calibrated the switch > to open at the lower temperature. > > Made a big difference in places like Florida, believe me! > > -D > >> On May 28, 2023, at 3:50 PM, Allan Streib via Mercedes >> wrote: >> >> I don't think a car AC will ever blow as cold as 10 degrees F. How are you >> measuring these temps? >> >> One can is probably not enough to damage anything, but if you're worried >> don't run the AC until you get a working pressure gauge, ideally a set that >> measures low and high side pressures. Harbor Freight sells them. >> >> https://www.harborfreight.com/r134a-ac-manifold-gauge-set-58776.html >> >> You can then compare your readings to a chart such as this one. >> >> https://jamcoautoparts.com/systempressuretroubleshootingchart/ >> >> >> On Sun, May 28, 2023, at 14:34, Robert Koziak via Mercedes wrote: >>> Hi All, >>> I just went to charge my 2011 Mercedes C300. The vents were >>> blowing 45 degrees F so I knew it needed some R134. The 134A adapter I >>> used has a faulty gauge! I used about one can and the vents were >>> blowing 10 degrees F after I charged the system. Did I overfill the >>> system and should I let some out? >>> Don't want to cause damage...help! I will buy a new >>> gauge tomorrow and check. >>> Thanks in advance! >>> Bob K >> >> ___ >> http://www.okiebenz.com >> >> To search list archives http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> > > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] AC Overcharged Question!!!
Thanks for the quick replies! I borrowed another digital temperature gauge from a neighbor and the readings were consistently between 26 F and 36 F at "max cold" when checked at the four vents. I suspect the digital Temperature Gauge I had was giving faulty readings too. The AC feels great but I was just concerned about an overfill causing problems. Tomorrow time to buy new gauges and recheck everything. Have a great Memorial Day! Bob K -Original Message- From: dan penoff.com via Mercedes To: Okie Benz Cc: dan penoff.com Sent: Sun, May 28, 2023 4:26 pm Subject: Re: [MBZ] AC Overcharged Question!!! AC is all about pressures and temperatures. It’s not something you can guess at and expect a specific outcome. And just as an aside, I suspect the 10 degrees comment was an embellishment rather than an exact reading. These systems have a low temperature cutout that would shut off the compressor if the evaporator freezes or temperature gets below a setpoint. There was a hack for the W126 chassis cars I used to do to mine: The compressor cutout on these was a mechanical switch connected to a capillary tube that was positioned between the evaporator fins in the heater box. It’s easy to remove. I think they typically cut out at 40F or maybe slightly below that. You could recalibrate them by putting the capillary into a glass of crushed ice/water to get it down to near freezing. Using a test light or an ohmmeter, you calibrated the switch to open at the lower temperature. Made a big difference in places like Florida, believe me! -D > On May 28, 2023, at 3:50 PM, Allan Streib via Mercedes > wrote: > > I don't think a car AC will ever blow as cold as 10 degrees F. How are you > measuring these temps? > > One can is probably not enough to damage anything, but if you're worried > don't run the AC until you get a working pressure gauge, ideally a set that > measures low and high side pressures. Harbor Freight sells them. > > https://www.harborfreight.com/r134a-ac-manifold-gauge-set-58776.html > > You can then compare your readings to a chart such as this one. > > https://jamcoautoparts.com/systempressuretroubleshootingchart/ > > > On Sun, May 28, 2023, at 14:34, Robert Koziak via Mercedes wrote: >> Hi All, >> I just went to charge my 2011 Mercedes C300. The vents were >> blowing 45 degrees F so I knew it needed some R134. The 134A adapter I >> used has a faulty gauge! I used about one can and the vents were >> blowing 10 degrees F after I charged the system. Did I overfill the >> system and should I let some out? >> Don't want to cause damage...help! I will buy a new >> gauge tomorrow and check. >> Thanks in advance! >> Bob K > > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] AC Overcharged Question!!!
AC is all about pressures and temperatures. It’s not something you can guess at and expect a specific outcome. And just as an aside, I suspect the 10 degrees comment was an embellishment rather than an exact reading. These systems have a low temperature cutout that would shut off the compressor if the evaporator freezes or temperature gets below a setpoint. There was a hack for the W126 chassis cars I used to do to mine: The compressor cutout on these was a mechanical switch connected to a capillary tube that was positioned between the evaporator fins in the heater box. It’s easy to remove. I think they typically cut out at 40F or maybe slightly below that. You could recalibrate them by putting the capillary into a glass of crushed ice/water to get it down to near freezing. Using a test light or an ohmmeter, you calibrated the switch to open at the lower temperature. Made a big difference in places like Florida, believe me! -D > On May 28, 2023, at 3:50 PM, Allan Streib via Mercedes > wrote: > > I don't think a car AC will ever blow as cold as 10 degrees F. How are you > measuring these temps? > > One can is probably not enough to damage anything, but if you're worried > don't run the AC until you get a working pressure gauge, ideally a set that > measures low and high side pressures. Harbor Freight sells them. > > https://www.harborfreight.com/r134a-ac-manifold-gauge-set-58776.html > > You can then compare your readings to a chart such as this one. > > https://jamcoautoparts.com/systempressuretroubleshootingchart/ > > > On Sun, May 28, 2023, at 14:34, Robert Koziak via Mercedes wrote: >> Hi All, >> I just went to charge my 2011 Mercedes C300. The vents were >> blowing 45 degrees F so I knew it needed some R134. The 134A adapter I >> used has a faulty gauge! I used about one can and the vents were >> blowing 10 degrees F after I charged the system. Did I overfill the >> system and should I let some out? >> Don't want to cause damage...help! I will buy a new >> gauge tomorrow and check. >> Thanks in advance! >> Bob K > > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] AC Overcharged Question!!!
I don't think a car AC will ever blow as cold as 10 degrees F. How are you measuring these temps? One can is probably not enough to damage anything, but if you're worried don't run the AC until you get a working pressure gauge, ideally a set that measures low and high side pressures. Harbor Freight sells them. https://www.harborfreight.com/r134a-ac-manifold-gauge-set-58776.html You can then compare your readings to a chart such as this one. https://jamcoautoparts.com/systempressuretroubleshootingchart/ On Sun, May 28, 2023, at 14:34, Robert Koziak via Mercedes wrote: > Hi All, > I just went to charge my 2011 Mercedes C300. The vents were > blowing 45 degrees F so I knew it needed some R134. The 134A adapter I > used has a faulty gauge! I used about one can and the vents were > blowing 10 degrees F after I charged the system. Did I overfill the > system and should I let some out? > Don't want to cause damage...help! I will buy a new > gauge tomorrow and check. > Thanks in advance! > Bob K ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
[MBZ] AC Overcharged Question!!!
Hi All, I just went to charge my 2011 Mercedes C300. The vents were blowing 45 degrees F so I knew it needed some R134. The 134A adapter I used has a faulty gauge! I used about one can and the vents were blowing 10 degrees F after I charged the system. Did I overfill the system and should I let some out? Don't want to cause damage...help! I will buy a new gauge tomorrow and check. Thanks in advance! Bob K ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
