Thread: W140 AC Problem
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Old 09-12-2002, 06:37 PM
Ken Griffith Ken Griffith is offline
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Join Date: Dec 2001
Location: Rocklin CA
Posts: 65
W140 AC Problem

96 S500. AC blower stopped working. Just replaced the blower regulator. Blows again except now the "auto" function is erratic.

Let me give you the symptoms.

98 Degrees outside Inside both driver and passanger set to 73% and auto. AC barely blows. If i move the temp down to "low" on both(only doing one doesn't work" the AC blower goes on full throttle. If I go down in temp but not quite to low, no change. I can also hit the little blue button in the center vents and set the fan manually and the blower goes correctly. What could be the problem, the temp sensor?

I had the blower regulator changed at a shop, but I took the cowling and stuff off when I was troubleshooting. I didn't know what I was doing and there looks like there is a vacuum operated flap over the blower that is probably activated by the recirculate button on the center console. I took off the vacuum connector to this flap and when I put it back on I may have done it wrong. I don't think this has anything to do with the problem of temp activation, but thought I mention it.

Any ideas would be much appreciated.

I can give you the troublehsooting readout using the rest button if you need them.

Anyone want to start me in a diagnosis direction?

Ken G
96 S500 79K (great white whale)
98 E430 80K Sports Package (gray ghost)
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