Re: Now I need some advice / help! AC system / heater control valve assembly
Originally Posted by
RED DOG
Hi Dr. George, That's what I thought too. That doesn't inspire confidence in the local independent Mercedes repair shop owner. I'll take the car up to J S Benz in Miami. That's where they do all the V8 conversion work with Rudy. They know their stuff . . .
Will post the outcome here when I get the car back.
The ambient air temp sensor may be perfect but the system it plugs into may have a fault in it. I would follow the instructions in the Service manual to check this sensor out. Also test the solenoids as explained in the Service Manual. The solenoids must shut down or the heat will overcome the AC cold air.
Have you considered putting a clamp on the hose where it goes behind the overflow tank? That should stop the heat and prove the AC system is working fine.
The air compressor works even though we have the AC system OFF, it is used to dehumidify air used inside the car. If it is not used moist air is blown on to a cool windshield which then fogs up.
To understand the AC system better you should read the Student Handbook CLICK in the documentation thread. The Service Manual does not explain too much at all.
I have not studied what has been going on here much as I have been sick with the flu, but have you studied the control panel on the console? If this is not working then all sorts of problems can occur. A member said poor contacts cause most of the problems. CLICK
Last edited by onehundred80; Mar 30, 2018 at 09:09 AM.