Over the last couple years my heater fan has pushed less and less air, It is hot when heating and cool when running the AC but the airflow is poor. I checked the fan and it blows fine, so it is not a blower fan issue.

WHAT I DISCOVERED - I reached into the heater box, the AC evaporator appears to be plugged with an oily linty greasy substance.

Has anyone experienced this? Is this from drawing engine compartment (engine breather) gasses into the heater inlet? Any ideas or suggestions, I would like to avoid decharging the AC system and tearing the heater box out to clean.

Thanks
gitchyboy

 

My wife's Cavalier did this too. I was able to spray it with brake cleaner and get most of it out. Stunk up the car a bit. Not my car. I don't know what causes it though. Might be poplar tree fuzz as we have a lot of them around here.

 

Was the stuff in the core oily too?

 

It was black greasy crap. The freon had leaked out over time. It might have been a mixture of freon and dirt/tree fuzz/etc. I recharged it with a propane based do-it-yourself kit. It was plugging up before I recharged it though.
I had a rad on my '86 GMC plug up with poplar fuzz. It made it through the AC condenser but plugged up the rad. Maybe it gets a little condesation on it with a temp change and sticks to the fins, plugging up in time. If anybody else has any ideas on this, feel free to jump in.

 

The only idea I have is the part about Propane, I hope you don't have a evaporator leak and you smoke!

 

But the good thing is .......................If you have a "gas" problem, you just blame the A/C!!!!

 

Great idea! I figure I could get away with it for about 3 seconds before the wife cuffed me and called me all sorts of degrading names.

 

Sounds like your going to need a evaporator. Mine gave up at 55K
I had a hard time believing it was the evap. I had some florescent
dye 134 added. About two weeks later checked it with a Black Light at the Pee Hole. No doubt about it. After removal, it had two holes in it. ??? 700.00 dollars later.

Dave

 

Did yours plug with junk too, or did it just stop cooling, as posted in a previous comment, we too have a lot of cottonwood trees or poplars and their seeds are fuzzy and could plug it, as I said earlier, the air is cold, it just blows very slow.

 

You could be full of what ever, but if the refrigerate is low, add some Florescent to it and see. I think its leaking just because you said it was gummed up. If there is nothing to stick to it should be good.

Dave