Date registered: Sep 2011
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1978 450 slc heater/ac control issues.
I have a 1978 Mercedes 450slc, California rust free car. The heater/ac controller has issues. Defrost and off button are the only ones that work. I replaced the ac relay under the dash figuring this would solve the problem since prior to switching out the relay, the off button when depressed would blow air and the defrost button when depressed would turn the system off. The other buttons worked as well. Now that I changed the relay it only works on defrost and off. Basically I'm trying to get the ac to work to no avail. System is charged with freon, I just cannot figure out why I cannot get all the buttons to work on this controller. I have even replaced the heater ac controller as well and have the same results as the original one I replaced. Anyone know what the fix is for this? Is there another relay in the fuse panel that is bad that is causing this debacle? I want to fix it so I can sell the car, and I live in las Vegas, so it's hard to sell a vintage Mercedes if the air doesn't work.
Thanks in advance for any and all help.