Sean Garrity· Registered
Hello, I am new to this "forum" stuff so hear it goes. I have bought a 1999 e300 about 6 months ago and at the time it was warm outside and the airconditioning was doing the blow warm air out of left vent sometimes thing. Through forums and questioning, I eventualy fixed that with a tap to the duovalve. This all after recharging the 134 system and replacing the cracked radiator. So all was well through the spring and summer but now not so. Now I have no heat, none. Just cold ,AC air, blows from whatever vent I select unless I hit the econ button. Hear is what I have done so far; unplugged duovalve, took appart duovalve and cleaned, listened to the external water pump make gurgling sounds when hoses where off, checked power to external pump and duovalve, checked the acc codes and the only onse where for left and right duovalve solenoids. The duovalve is hot on top, when car is at opperating temp, and cold on bottom. The two brass looking plungers in the bottom of duovalve where just sitting there when I took it appart and that seemed odd unless the system is flowing backwards from what I am thinking. The solenoids pushed the shafts down when I had it appart and connected to power and put acc on low. I am confused hear and would appreciate some good advice. Also the acc rest button does nothing, no lite when pressed and does not turn off the ac compressor. Sorry for the long post.