Hi all, I know that most of you are asking questions related to earlier vehicles but this for this one i need some headscratching advice. I have a 1992 Park Ave and everything is working excellent but the climate control. It functions well and i can here noise through all the vents as it changes modes but it will not direct air to any particular vent. It makes alot of fan noise and i can feel the air all around and when i change modes the vacuum doors are functioning(stuck my finger in one and nearly lost it)haha. It only blows minimal air through each vent and i'm thinking that there is a restriction somewhere. Does anyone have any ideas apart from taking the hvac apart?? Just looking to see if anyone else has experienced this problem. Thanks,Brian.o No:
The usual cause for poor airflow is the outside of the evaporator plugged with dirt, pet hair, leaves, rodent nest, etc. You may be able to remove the blower motor and see the evap to clean it. If not you will have to remove the evaporator, which "could" involve pulling the instrument panel. I don't recall on your 92. There is no combination of door positions in the MVAC case that will block airflow like you describe. If the car has a pollen filter, remove it and see if it is pluigged. I don't think your 92 has one but mentioned it just in case. Good Luck
I just went through this with my '92 Park Ave. after suffering through several hot summers. Along the top of the firewall is the relay center. Remove the relay center and tie it off to the side. You will then gain access to the blower module that sits on top of the air box.(I think it is called an EEC module ?) Remove this module, and you will have access to the evaporator core. I rigged up an extension to my shop vac to reach in and clean the black fuzzy crap that was blocking air flow. Along with blowing it with compressed air. The car has been a joy to drive now that I have working AC! It's gonna make a huge difference in winter too! I know I saw diagrams of what I am describing. I will hunt around and post them here if I find them. Edit: :kodak: Ok, here is a diagram showing the case that the evaporator and blower are mounted in. See that small square opening on the top? That is were that blower module sits, and once removed that opening is your access to the evaporator core. Mine was so black with dirt that when I first looked down in it with a flashlight, I couldn't tell the evaporator core from the rest of the heater case. I think the entire job took me a 1/2 hour. Afterwards, I couldn't believe I didn't address it sooner since it was so simple to fix. Hope this helps! :beer
While you are at it, go ahead and take the blower motor out and clean that area and the fan. You'd be surprised what small "critters" will leave in there.
Sometimes it takes someone outside the box to remedy a simple problem. I believe you guys are on the right track and i'm going to check it out as soon as possible. Once you take off the fuse panel cover is there much more to take off to remove it and access the blower motor relay?? I haven't really gone that deep into the problem yet but i think you're correct with your diagnosis.(did the same thing with heat in the winter) The car has fairly high mileage(350km)and is all original including the paint and painted on stripe. But being from the dust bowl we have out here in Calgary it would surprise me if the evaporator isn't clogged up somewhat. Hey,and thanks Dale for the pic,i can now envision what it looks like apart and that'll save me alot of time. Gonna get to it!! Thanks,Brian!!:beer Havin' a cooly now so cheers!!
Brian, Once you get that relay box out of the way, (just a couple of nuts) the blower module is sitting right there. :TU:
That was the best advice i've had in a long time!! Worked like a charm. It was a little difficult keeping the fuse panel out of the way, but when i got in there,man what a mess!! I used two cans of brake clean and a small shop vac and got about 90% of the dirt out. It's blowing 40 degrees out of the vents now. My guess is that the evaporator may also have a small leak which just makes more of an oily mess. The brake clean not only cleans up the oil but washes it out the drain tube and then evaporates. Thanks so much for the info Dale and everyone else. I have been searching for a good website and have not found the info that i'm getting here. Don't get me wrong,they are all good but this is my favorite!! I haven't even looked through it all yet. Anyways,thanks for the info and anytime i can be of help i'll put my two cents in too!! :TU: Thanks,Brian.:beers2:
Glad to hear it was successful! :beers2: Since I bought my Park Ave., I thought I would have to remove that heater case to get at the evaporator core. I have the GM shop manual, and every now and then I would think about tackling the job. Then I would open the hood and be reminded that it appears they built the car around it, and would just shake my head and close the hood. (without the engine in the car it would be easy!) It was a few months ago that I started doing Google searches on the problem again, and came across the tip of going through the hole were the fan module is.
