Fresh air servo motor
A recent thread talked about servicing these fresh air servo motors. I found the three behind the gas tank no problem. There are supposed to be servo motors in the drivers and passenger foot wells. I checked the drivers footwell but there was no motor visible. I believe I read somewhere that the foot well servo's were deleted on the 98's but I could be wrong. Haven't checked the passenger foot well yet. It's on my agenda. Should there be one on the driver's side?
Also, it was suggested that those motors be serviced. Looking into the trunk behind the gas tank, I checked the action of the motors on the left and right. They do function correctly when activated. From the readings I've done, the center one only actuates when the car is moving but never closes completely. My question is.....since the motors seem to be functioning, should they be left alone or should they be taken apart and cleaned and lubed. My thought is....if it ain't broke, don't fix it but if servicing them will prevent breakage, then I'll do it. What's the consensus on servicing these motors. Any help much appreciated. JC 98 C2S widebody |
Re the servo motor in the driver's footwell, there is a cylindrical metal piece connected to two hoses (one hose brings hot air from the engine bay and the other goes to the climate control assembly). This metal piece contains the flap that determines how much hot air goes to the heater. The motor is attached to this metal piece. This is shown in Figure 813-00 in the 993 PET. This is what I have in my '97. I haven't heard that they eliminated this for '98, but I doubt that they would have done so because without the flap and motor there would be no way to control how much hot air goes to the heater.
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There is no need for servicing these servos unless they have failed. Do NOT lubricate the servo internals. The gear box needs some plastic gear grease, but with very careful application to the final gears to avoid problems. Unless contaminated, the original grease is quite sufficient.
You are indeed wrong, all 993's has the same servo setup, there were no changes in 98 models. The fresh air servo shall close at ignition off, and move continiously while the car is used in order to control the cabin temperature. This is also the case with the two mixer servos in the foot wells. Movement depends on the CCU temp setting and ambient temperature. See this page for a DIY test procedure and fault overview. Cheers, Tore |
Originally Posted by jac911
(Post 15910271)
Questions:
The only things I would add to them:
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