Re: [MBZ] Electromagnetic fan clutch
The sum total of my testing thus far has been to ensure that there was power at the clutch. I tested each pole against the others and each pole to ground. The only place I found power was from each to ground. -Curt Date: Thu, 12 Jul 2007 13:59:45 -0500 From: John Robbins [EMAIL PROTECTED] Subject: Re: [MBZ] Electromagnetic fan clutch To: Mercedes Discussion List mercedes@okiebenz.com Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=ISO-8859-1; format=flowed Curt Raymond wrote: When I tested for power I got +12v on BOTH of the wires... Nothing between them... There is some bodgered wiring in the vicinity of where the wires from the clutch come back into the harness over between the powersteering pump and the valve cover. A mystery brown wire was added in at some point I think to force the A/C to come on while the ACC controller was disconnected (plug fell off, I found it because I thought the lights were out) this was all pre-me by the way. I'll dig some more tonight, maybe I'll pull one of the wires and put a ground on and see what happens. Did you ground the wire that is on the temp switch on top of the engine? - Building a website is a piece of cake. Yahoo! Small Business gives you all the tools to get online. ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Electromagnetic fan clutch
Of course... I'll try it again pulling the cable but... That I have 12v available still pretty much indicates a bad clutch right? Not at all. Pretend it's hydraulics, if it'll help. Not much happens if you hook _both_ sides to the high pressure line! You should be able to measure the resistance between the two pins of the clutch. Coupla ohms? Hook +12V AND GROUND to it and it should clack. If it doesn't, then yes indeed it is bad. It really sucks to replace a moderately expensive part only to find no change. -- Jim ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Electromagnetic fan clutch
Curt Raymond wrote: Of course... I'll try it again pulling the cable but... That I have 12v available still pretty much indicates a bad clutch right? Not really. Just ground the cable that goes to the temp sensor... Its top and center... right near the thermostat housing IIRC. That is the switch that normally turns on the clutch, so its a perfect way to test the clutch. John ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Electromagnetic fan clutch
*Beats head on desk* Of course... I'll try it again pulling the cable but... That I have 12v available still pretty much indicates a bad clutch right? -Curt Date: Thu, 12 Jul 2007 15:39:06 -0400 From: Marshall Booth [EMAIL PROTECTED] Subject: Re: [MBZ] Electromagnetic fan clutch To: Mercedes Discussion List mercedes@okiebenz.com Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=ISO-8859-1; format=flowed Curt Raymond wrote: Cheez whiz, I can't believe I forgot, its an '85 190D. Okay barring the fact that I need to flush the cooling system When I tested for power I got +12v on BOTH of the wires... Nothing between them... There is some bodgered wiring in the vicinity of where the wires from the clutch come back into the harness over between the powersteering pump and the valve cover. A mystery brown wire was added in at some point I think to force the A/C to come on while the ACC controller was disconnected (plug fell off, I found it because I thought the lights were out) this was all pre-me by the way. I'll dig some more tonight, maybe I'll pull one of the wires and put a ground on and see what happens. If you are measuring the voltage on the pins without disconnecting the wire from the fan and IF the switch complete the circuit to ground (and I believe that is the case in the '85 190D), then there WILL be 12V on both pins except when the switch is closed. Then there will be 12+V on one pin and less than 1 V on the other. Marshall -- Marshall Booth Ph.D. Ass't Prof. (ret.) Univ of Pittsburgh School of Medicine [EMAIL PROTECTED] - The fish are biting. Get more visitors on your site using Yahoo! Search Marketing. ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
[MBZ] Electromagnetic fan clutch
Finally took the time to figure out why my car heats up when its sitting still, like in heavy traffic. The electromagnetic fan clutch isn't engaging at all... So with multimeter in hand there is 12v at the clutch at both of the wires that come to it. Is one wire to engage the clutch a bit and the other engage more? Is this a relatively easy job? It looks like the fan shroud might have to come out, theres not alot of extra space... Kaleb, any electromagnetic fan clutches hanging around? Rusty needs $130 for one. How often do they fail? Is a used one worth doing? -Curt - Ready for the edge of your seat? Check out tonight's top picks on Yahoo! TV. ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Electromagnetic fan clutch
Curt Raymond wrote: Finally took the time to figure out why my car heats up when its sitting still, like in heavy traffic. The electromagnetic fan clutch isn't engaging at all... So with multimeter in hand there is 12v at the clutch at both of the wires that come to it. Is one wire to engage the clutch a bit and the other engage more? Is this a relatively easy job? It looks like the fan shroud might have to come out, theres not alot of extra space... Kaleb, any electromagnetic fan clutches hanging around? Rusty needs $130 for one. How often do they fail? Is a used one worth doing? One wire is the 12V to the clutch and the other wire is the ground connection. Both must be intact for the fan to engage. If you connect 12V and ground to those wire (with the proper polarity) the clutch will click. If it doesn't, the clutch coil is bad and will need to be replaced. You engine should NOT overheat under moist conditions even on HOT days (as long as the AC isn't running) even with NO clutch and no fan action. The fan isn't designed to come on until the coolant temp reaches 100+ degrees. That won't happen at idle or at even medium loads (at highway speeds or when climbing mountains it might need the fan) even on very hot days. My cars never exceed about 95 degrees C in city driving - even stop and go with ambient temps in the 90+ deg. F. range so the fan NEVER engages (unless the AC is on - that increases the load and engine coolant temps). If it's overheating then there is SOMETHING other than the fan clutch that's wrong. Marshall -- Marshall Booth Ph.D. Ass't Prof. (ret.) Univ of Pittsburgh School of Medicine [EMAIL PROTECTED] ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Electromagnetic fan clutch
Marshall Booth wrote: You engine should NOT overheat under moist conditions even on HOT days (as long as the AC isn't running) even with NO clutch and no fan action. The fan isn't designed to come on until the coolant temp reaches 100+ degrees. That won't happen at idle or at even medium loads (at highway speeds or when climbing mountains it might need the fan) even on very hot days. My cars never exceed about 95 degrees C in city driving - even stop and go with ambient temps in the 90+ deg. F. range so the fan NEVER engages (unless the AC is on - that increases the load and engine coolant temps). If it's overheating then there is SOMETHING other than the fan clutch that's wrong. Not sure what the original car in question was, but this was true of my 190D 2.2 for the brief time I owned it. The only time the clutch engaged was when I pulled off the interstate after doing ~80 with the A/C on. Immediately stopped and fueled up (gas station was about 300ft off the interstate). Once I started it back up everything had heat soaked and the fan engaged. It would get up to *almost* 100C in stop and go traffic though... John ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Electromagnetic fan clutch
Cheez whiz, I can't believe I forgot, its an '85 190D. Okay barring the fact that I need to flush the cooling system When I tested for power I got +12v on BOTH of the wires... Nothing between them... There is some bodgered wiring in the vicinity of where the wires from the clutch come back into the harness over between the powersteering pump and the valve cover. A mystery brown wire was added in at some point I think to force the A/C to come on while the ACC controller was disconnected (plug fell off, I found it because I thought the lights were out) this was all pre-me by the way. I'll dig some more tonight, maybe I'll pull one of the wires and put a ground on and see what happens. -Curt Date: Thu, 12 Jul 2007 14:39:27 -0400 From: Marshall Booth [EMAIL PROTECTED] Subject: Re: [MBZ] Electromagnetic fan clutch To: Mercedes Discussion List mercedes@okiebenz.com Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=ISO-8859-1; format=flowed Curt Raymond wrote: Finally took the time to figure out why my car heats up when its sitting still, like in heavy traffic. The electromagnetic fan clutch isn't engaging at all... So with multimeter in hand there is 12v at the clutch at both of the wires that come to it. Is one wire to engage the clutch a bit and the other engage more? Is this a relatively easy job? It looks like the fan shroud might have to come out, theres not alot of extra space... Kaleb, any electromagnetic fan clutches hanging around? Rusty needs $130 for one. How often do they fail? Is a used one worth doing? One wire is the 12V to the clutch and the other wire is the ground connection. Both must be intact for the fan to engage. If you connect 12V and ground to those wire (with the proper polarity) the clutch will click. If it doesn't, the clutch coil is bad and will need to be replaced. You engine should NOT overheat under moist conditions even on HOT days (as long as the AC isn't running) even with NO clutch and no fan action. The fan isn't designed to come on until the coolant temp reaches 100+ degrees. That won't happen at idle or at even medium loads (at highway speeds or when climbing mountains it might need the fan) even on very hot days. My cars never exceed about 95 degrees C in city driving - even stop and go with ambient temps in the 90+ deg. F. range so the fan NEVER engages (unless the AC is on - that increases the load and engine coolant temps). If it's overheating then there is SOMETHING other than the fan clutch that's wrong. Marshall -- Marshall Booth Ph.D. Ass't Prof. (ret.) Univ of Pittsburgh School of Medicine [EMAIL PROTECTED] - Be a better Heartthrob. Get better relationship answers from someone who knows. Yahoo! Answers - Check it out. ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Electromagnetic fan clutch
Curt Raymond wrote: When I tested for power I got +12v on BOTH of the wires... Nothing between them... There is some bodgered wiring in the vicinity of where the wires from the clutch come back into the harness over between the powersteering pump and the valve cover. A mystery brown wire was added in at some point I think to force the A/C to come on while the ACC controller was disconnected (plug fell off, I found it because I thought the lights were out) this was all pre-me by the way. I'll dig some more tonight, maybe I'll pull one of the wires and put a ground on and see what happens. Did you ground the wire that is on the temp switch on top of the engine? ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Electromagnetic fan clutch
Curt Raymond wrote: Cheez whiz, I can't believe I forgot, its an '85 190D. Okay barring the fact that I need to flush the cooling system When I tested for power I got +12v on BOTH of the wires... Nothing between them... There is some bodgered wiring in the vicinity of where the wires from the clutch come back into the harness over between the powersteering pump and the valve cover. A mystery brown wire was added in at some point I think to force the A/C to come on while the ACC controller was disconnected (plug fell off, I found it because I thought the lights were out) this was all pre-me by the way. I'll dig some more tonight, maybe I'll pull one of the wires and put a ground on and see what happens. If you are measuring the voltage on the pins without disconnecting the wire from the fan and IF the switch complete the circuit to ground (and I believe that is the case in the '85 190D), then there WILL be 12V on both pins except when the switch is closed. Then there will be 12+V on one pin and less than 1 V on the other. Marshall -- Marshall Booth Ph.D. Ass't Prof. (ret.) Univ of Pittsburgh School of Medicine [EMAIL PROTECTED] ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Electromagnetic fan clutch
Not a good idea to just measure voltage with a meter either. Sometimes there is sufficient contact to let the meter read correctly, but not enough to provide power to the unit. Sometimes things like a poor ground are all that is wrong. At the very least, use one of the test light doodads. If the light is bright, then there is likely a good circuit. Randy -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Marshall Booth Sent: Thursday, July 12, 2007 2:39 PM To: Mercedes Discussion List Subject: Re: [MBZ] Electromagnetic fan clutch Curt Raymond wrote: Cheez whiz, I can't believe I forgot, its an '85 190D. Okay barring the fact that I need to flush the cooling system When I tested for power I got +12v on BOTH of the wires... Nothing between them... There is some bodgered wiring in the vicinity of where the wires from the clutch come back into the harness over between the powersteering pump and the valve cover. A mystery brown wire was added in at some point I think to force the A/C to come on while the ACC controller was disconnected (plug fell off, I found it because I thought the lights were out) this was all pre-me by the way. I'll dig some more tonight, maybe I'll pull one of the wires and put a ground on and see what happens. If you are measuring the voltage on the pins without disconnecting the wire from the fan and IF the switch complete the circuit to ground (and I believe that is the case in the '85 190D), then there WILL be 12V on both pins except when the switch is closed. Then there will be 12+V on one pin and less than 1 V on the other. Marshall -- Marshall Booth Ph.D. Ass't Prof. (ret.) Univ of Pittsburgh School of Medicine [EMAIL PROTECTED] ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Electromagnetic fan clutch
nope, dont have one Curt Raymond wrote: Finally took the time to figure out why my car heats up when its sitting still, like in heavy traffic. The electromagnetic fan clutch isn't engaging at all... So with multimeter in hand there is 12v at the clutch at both of the wires that come to it. Is one wire to engage the clutch a bit and the other engage more? Is this a relatively easy job? It looks like the fan shroud might have to come out, theres not alot of extra space... Kaleb, any electromagnetic fan clutches hanging around? Rusty needs $130 for one. How often do they fail? Is a used one worth doing? -Curt - Ready for the edge of your seat? Check out tonight's top picks on Yahoo! TV. ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com -- Kaleb C. Striplin/Claremore, OK 94 E420, 92 300D, 92 250D Turbo, 92 300E 4Matic, (2x) 91 300D, 90 420SEL, 89 560SEL, 89 260E, 87 300SDL, 87 300TD, 85 380SE 5.0 Euro, 81 240D, 81 380SLC, 80 240D, 76 240D, 76 300D, 72 250C, 69 250 http://www.okiebenz.com ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
