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1989 420SEL Air Conditioning Temp. Switch
I just inspected my 1989 420SEL W126 air conditioning system and there seems to problem at the dryer with the refrigerant temp. switch. With the inside heating/cooling climate control unit (CCU) requesting 15c and the ambient temperature being 29c, the AC turns on, and blows cold air but when I check for power at the red temperature switch located on the dryer, there is no power on either wire. I would think that switch needs power whenever the AC is turned on and the compressor is engaged. When I unplug the engine coolant temp. sensor from the engine, the electric auxiliary fan does come on. The system is charged with 2.9 lbs of 134a, and I believe it has the correct pressure.
What relay or device controls power to the refrigerant red temperature switch on the air conditioning dryer? How can I find the faulty part?
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1989 420 SEL
Last edited by Cigar Havana; 05-21-2009 at 08:10 PM.
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05-21-2009, 08:02 PM
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