The ECC diagnostics squawked a “00”, so I guess I’m going after the HVAC Controller. That seems reasonable since it seems like the ECC has lost its mind. Out of all the things that could go wrong with the system, I’m going to guess that this is the most expensive to remedy. I would expect nothing less. How difficult is it to replace this unit – is it easier to access than the air mix controller?
Here’* a strange data point. When my wife drove the car yesterday and set the temperature like I told her to, she claimed she was getting lukewarm air. (Coolant level was fine, BTW). I drove the car last night just like she would – start it, throw it in gear, and take off down the road. I then adjusted the temperature on the fly, waiting for the flashing to stop, setting the temp at 60, then setting it at 90. I’m not sure I’d classify the air coming out the heater vent as lukewarm. I’d call it COLD. When I got to the school I checked the position of the air door arm and, sure enough, it was dang near full cold. After we were done at the school, I used the same procedure to pump warm air out of the heater only this time I didn’t take the car out of Park until I was done with the routine on the ECC. I was rewarded with heat all the way home. What in tarnation is the relationship between the vehicle moving and the operation of the ECC?
It’* probably a moot point, but I’m going to do some more testing before I change the HVAC Controller. I think I’ll have my wife drive me around while I play with the ECC. Does the car have to be moving or just put into gear? If I set the temp on the fly, then stop and put it in Park, can I reset it and get heat or do I have to shut it off? I have
to know. For no other reason than just to know.
Maybe I’ll have my wife pull into McDougal’* while I’m tinkering and I’ll buy her a Happy Meal. Then I can call it a date.
I've GOT to get me one o' them FSMs! I took a look at the rest of the diagnostic features Will mentioned and there'* some cool information there. I just don't know how to decode it. It'* like showing a dog a scratch-n-sniff picture of a rack of ribs - now I'm salivating and won't be satisfied until I have the whole enchilada.