Date registered: Aug 2012
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Climate Control Servo or More?
I may need to order some parts for my 1980 300SD Mercedes. The car is in outstanding condition with 130,000 miles on it. However, I started running into problems with the air conditioner vents LAST summer.
First, I noticed the center 2 vents closed and would not open. So my air conditioner would blow cold air out of the defrost and the far left and right vents. Cold air was still blowing.
This winter I was able to adjust the climate control wheel and turn on the heat. Used the heat all winter. Over the winter I noticed there was a small 1 inch crack in the climate control server housing. I put JB Weld on the crack to keep it from getting worse.
Now that the weather has warmed up here in Atlanta, I tried to turn on the AC today. I adjusted the climate control wheel to 65 degrees, turned on the AC button and I heard the compressor engage, however the climate control servo did not turn.
Today I did some diagnostics and I disconnected the servo vacuum and power plugs and manually connected 12 volts power right to the 2 servo power pins. This successfully turned on the servo and I heard the gear turn all the way. Assuming this would activate the AC system I plugged the vaccum and power connectors back to the servo, got back in the car and went for a test drive. Still no cold air. Heat only from the defrost vent and side vents.
Seems like the system is stuck in Heat mode and the center vents are closed and defrost vent is always open.
Are these systems of a bad climate control servo or is there more to it? (vents not opening)