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#1
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No heat with evil servo
I have not been able to get heat in my 1980 300sd with the dreaded evil servo setup. The original servo in the car was not working, severely cracked and plugged up with crud. I recently replaced it with a nice used aluminum unit. The motor in the new servo seems to work because I can hear it running after I shut the car off. I also replaced the amplifier with a rebuilt unit and put in a new auxilliary water pump which is working. When I push the defrost button, the blower comes on but I get no heat. When I push auto lo or auto high, the blower will not come on at all. So i have two questions. Number one, why am I not getting any heat in defrost? Number two, why will the blower not even come on in the auto lo or auto high positions?
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#2
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It works in the defrost position because that is the default for the system. I linked the manual for the evil servo system in a post here so if you search on my username and servo manual, you'll find a link.
There is a central vacuum control switch which has to be activated for the system to function but if your blower is working, I believe that switch is functional. On my W116 there appears to be a second main switch next to the main vacuum switch. I've never looked into it far enough to determine what that switch controls but maybe it's not working correctly. On the W116 the vacuum control switch and the other switch are behind the glovebox.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#3
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Answer
Quote:
http://www.peachparts.com/shopforum/general-information/240606-evil-servo-service-manual.html#post2053754 http://www.imperialclub.com/Repair/Lit/Master/281/cover.htm Have a great day.
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
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