My ignorance it going to show here. Which is the recirculate button? I didn't see one. On the right I have a column of three buttons (high, low and auto fan speeds). Across the bottom I have a row of 5 (I believe) with "0" (off) at one end, defrost at the other, and three buttons with arrows in the middle (don't know the difference between the arrow buttons).
This car has a passenger-side airbag, so there is no glove box (so no nifty window in the back of it).
I went through steps 2-4. I did have some air coming out of the center vents when on heat, and some coming out of side vents when on cold, but most of the air was coming out where it should be.
I had someone help me with the monovalve check. She turned the temperature dial up and down while I had my finger on the monovalve (that's a tight spot back there). Each up and down I could feel the click of the valve. So it seems to be passing the click test.
I grabbed the metal coolant line that goes back to the firewall (right side of the engine) which I believe feeds the cabin heater. It was reasonably warm. Not too hot to touch though. I was expecting either completely cold or very hot.
Does this get me any closer to solving the problem?
Oh, by the way, periodically, with no apparent pattern, the heat will work just a little bit. I will get some none-freezing air coming out. It is a little short of "warm" but much better than what I normally get. Normally it feels just like the external air temperature (right now about 25-30 degrees F).
Thanks for the terrific list of ideas.
-Brett
Quote:
Originally Posted by S-Class Guru
One quick way to check for vacuum issues is to see if the system responds with air out the proper vents when you ask it to:
1. Hit the recirculate button and see if you hear the door pop open behind the glove box, also, the air should get louder.
Also, if you have good residual vacuum, you should be able to turn the key on, engine off, after sitting several hours, and hear the recirc door move. You can also see it, through the little panel in the back of the glove box.
2. Turn the temp down to cold, the air should switch to the center vents.
3. Turn the temp full hot, air should switch to floor and side-dash vents, with a little from defrost.
4. Defrost is the default, so if it's on defrost all the time, could be vacuum.
Turn it on defrost mode, and it should definitely blow hard out the defrost vents. turn the temp all the way up, it it stays cold, it's probably not getting hot water through the monovalve.
DG
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