Polman

I still have the heating problems. Hammer says that the servo is gone, but the movement works. I have taken the small torpedo wall away, opened the right side off the heating unit…and the flap works when I turn the **** in the car! Everything seams to work as it schould..but I still got the heat on in every setting. On the picture you see that I get cold air from one outlet (blue) and warm air from the other 3 ( red)….what have I missed? When I turn on the AC…no difference, but colder air from the same outlet (blue)

jimq

Mine was doing the same thing. I ended up buying 2 used servo motors last fall and replacing them and all is well again. Mine would work some times. The 2 motors were $100 for the pair used. Sure beats the $300 or so each for new.

Rocket Rob

Just a thought but what happens if you swap the two servos? Does the problem shift with them? This test may isolate if you have a bad servo problem or the problem is somewhere else?

Polman

-good thinking Bob, you just solved my weekend........prehaps you can help my wife with the garden!!
-I just have to give her some nice red wine on saturday so she goes to bed early.....and I can sneak down to the garage.

jimq

you can also just pop the swing arm off at the 2 end servos and see if you still have the heat. The
flaps are closed by default.

Kuchar

Polman, maybe Your right differential pressure valve/flap is permanently open?

Polman

Kuchar...do you mean the thing that says "klonk" when you close the door...located at the heat chambers?....I havent checked those, since the "klonk" is there...

Kuchar

Yes, this is it, but the problem is that the thing sometimes says "klonk" but it dosen't mean it is closed and makes hot air comes inside. My friend had this problem in his 964. Just check it.