: Found my HVAC air flow problem



turbojimmy
08-21-11, 06:40 PM
Like I thought....critters

It was plugged solid with crap that rodents dragged in. This also explains the "earthy" smell from the HVAC system.

I used a shop vac to get most of it out, and picked the rest of it out with a grabber tool I had (one of those things that has a retractable claw for grabbing stuff you can't reach).

Air flow is what I think it should be now. And it smells better.

When I pulled the blower control module out, it looked like this. I knew I had some work to do.
http://turbojimmy.4t.com/1994_limo_hvac_clog-1.jpg

http://turbojimmy.4t.com/1994_limo_hvac_clog-2.jpg

http://turbojimmy.4t.com/1994_limo_hvac_clog-3.jpg

I bet there's lots more in there, but I got enough out to get the air flow moving again.

csbuckn
08-21-11, 07:13 PM
Wow, at least it was a repair that didn't cost anything.

turbojimmy
08-21-11, 07:50 PM
That's the bright side - didn't cost anything.

The middle picture is AFTER I shop vac'd it. That's a mass of junk stuck to the evaporator core that I had to pick out. Once I was done, you could see the core again. There's still stuff stuck in the corners, but now air moves through there like it should.

I'd like to drop the cover for the heater core, too, which will expose pretty much the whole bottom of the air box. There's got to be a lot more in there.

I'm glad I got to the bottom of that. I knew there had to be some sort of blockage. The sound of the fan running didn't match up with the little bit of air that was coming out. Should've done the same thing to my '96. It had the same problem.

Rick James
09-07-11, 04:16 PM
Man TJ...how does that much crap fit in the AC system.

turbojimmy
09-07-11, 05:43 PM
Man TJ...how does that much crap fit in the AC system.

That's not even half of it. That's just the stuff I scraped off of the evaporator core. It was plugged solid. When I replaced the blower resistor last week, even more came out which is good because it's finally breaking up and falling down. The dank, wet-grass smell is finally starting to clear up.