[MBZ] any clues - tach AC shut off
Guys, This is getting annoying/frustrating; after disassembling every electrical plug/connection and ground I could find under the hood of my '85 300TD and cleaning and lubricating with conductive grease, my tach now seems to be working OK but my AC compressor won't come on. As per a suggestion from a post on the PeachParts forum, inserting a jumper wire between the female Klima pins #5 #10 with the engine running will turn the AC compressor on which supposedly suggests the problem resides in the Klima relay. When this all started when both the tach and AC would shut off after ~10-15 min. of driving, there were suggestions that the problem was the Klima relay but, now that the tach is working, I'm wondering if indeed the problem with the AC compressor not turning on lies elsewhere? Note: DCV between Klima pin #5 #10 1. w/ ignition on, PBU off, engine off 9.5 2. on 9.7 3.on 0.1 Aby further suggestions, holler. G. M. Brown Brevard, NC ___ http://www.okiebenz.com For new and used parts go to 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] any clues - tach AC shut off
Does your compressor have a speed sensor on it? I don't think a 617 engine does, but you should check. Having the AC compressor drop off line after a few minutes in later cars with a serpentine belt is a signal that the belt is bad and slipping, when the compressor slows down the KLIMA cuts it off until the ignition is cycled to prevent tossing the belt. Don't know if it is true of an 85 W123 through. You could also have problems with the KLIMA that re-soldering won't fix, too. Peter ___ http://www.okiebenz.com For new and used parts go to 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] any clues - tach AC shut off
After not having any noticeable effect on the tach AC stopping in my '85 300TD when I cleaned and lubricated the contact pins of the AC Overload Relay (up under dash to the far right side) with conductive grease, and resoldering the internal PCB of the AC Overload Relay, changing out the ACC PBU, and cleaned and lubricated the contact pins of the Klima Relay, I've resoldered the internal PCB of the Klima Relay and will take the car out tomorrow AM to see if this has any effect. I tried pricing both items on the I-net and can only find the AC Overload Relay @ $54.99 @ Ekler's but cannot find the Klima Relay. Anybody got an idea of what the Klima Relay would cost? I'll keep y'all updated after I've determined if the resoldering of the Klima Relay PCB has/not had any effect. G. M. Brown Brevard, NC ___ http://www.okiebenz.com For new and used parts go to 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] any clues - tach AC shut off
Prior to my '85 300TD engine going south, I noticed that my tachometer (goes to 0 rpm) and AC compressor would shut off after some random period of time. When starting the car from cold, both the tach and AC work OK. I recently had a rebuilt motor installed and this tach AC problem hasn't changed. The Freon Pressure Switch by the receiver/dryer is new and all the local connections there have been cleaned and lubricated with conductive grease, and the AC Overload Relay, located up under the dash on the far right side), has been taken apart, the PC board resoldered and connections cleaned and lubed and I still have the problem of the tach AC shutting off. Since the tach and AC compressor are on different fuses, I don't think the problem rests there. I'm wondering if the problem may be heat related, as the tach AC tend to shut off 5-15 min. after starting/running the car. Any clues? TIA. G. M. Brown Brevard, NC ___ http://www.okiebenz.com For new and used parts go to 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] any clues - tach AC shut off
G. M. Brown wrote: Prior to my '85 300TD engine going south, I noticed that my tachometer (goes to 0 rpm) and AC compressor would shut off after some random period of time. I'm wondering if the problem may be heat related, as the tach AC tend to shut off 5-15 min. after starting/running the car. Any clues? KLIMA relay? -- Philip ___ http://www.okiebenz.com For new and used parts go to 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] any clues - tach AC shut off
Klima relay Sent from my iPhone On Sep 3, 2012, at 9:26 AM, G. M. Brown g_010...@hotmail.com wrote: Prior to my '85 300TD engine going south, I noticed that my tachometer (goes to 0 rpm) and AC compressor would shut off after some random period of time. When starting the car from cold, both the tach and AC work OK. I recently had a rebuilt motor installed and this tach AC problem hasn't changed. The Freon Pressure Switch by the receiver/dryer is new and all the local connections there have been cleaned and lubricated with conductive grease, and the AC Overload Relay, located up under the dash on the far right side), has been taken apart, the PC board resoldered and connections cleaned and lubed and I still have the problem of the tach AC shutting off. Since the tach and AC compressor are on different fuses, I don't think the problem rests there. I'm wondering if the problem may be heat related, as the tach AC tend to shut off 5-15 min. after starting/running the car. Any clues? TIA. G. M. Brown Brevard, NC ___ http://www.okiebenz.com For new and used parts go to 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 For new and used parts go to 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
