Low air flow from all vents

[bstone]

Hello-

After reading several forums, I think I am facing a clogged evaporator. Just trying to confirm.

Air is cold on AC, and warm on heat. It blows where it is supposed to blow based on the setting I have on the dash. The fan seems to work on all speeds. Problem is, there just isn't much air flow. Like on high it's barely coming out, although the fan is definitely on high.

Thoughts? Opening up that evap housing looks like a real pain...

Thanks

 

[fastpakr]

Don't take off the housing. Just remove the blower motor and spray into the housing on the evaporator with foaming coil cleaner. Let it sit for a couple of minutes, then spray it off worth a garden hose and spray attachment. Repeat until everything you can see looks clean. Just went through this on my 99 last weekend.

 

[bstone]

Don't take off the housing. Just remove the blower motor and spray into the housing on the evaporator with foaming coil cleaner. Let it sit for a couple of minutes, then spray it off worth a garden hose and spray attachment. Repeat until everything you can see looks clean. Just went through this on my 99 last weekend.

Thanks for the tip- I'll give it a try. Where did you get the coil cleaner? Mine is a 94- same setup?

 

[fastpakr]

This was on the shelf at Lowes and worked well:
https://www.lowes.com/pd/WEB-Green-White-Aerosol-Foam-Coil-Cleaner/1000024695

I went through the process three times as I recall and barely used half a can.

 

[bstone]

This was on the shelf at Lowes and worked well:
https://www.lowes.com/pd/WEB-Green-White-Aerosol-Foam-Coil-Cleaner/1000024695

I went through the process three times as I recall and barely used half a can.

Found some today at home depot. As far as hosing it out, did you have any trouble getting it to drain?

 

[fastpakr]

It should drain straight out the bottom of the evaporator housing. Check as soon as you're done to make sure all your carpets are dry though.

 

[bstone]

Well, I tried this a week or so ago, and I didn't seem to pick up much air flow. Also noticed that there is no air at all coming out of the far right passenger vent...

 

[fr7]

My few cents... Have you checked for vacuum leaks in the system? Under the hood and under the dash. A bad diaphragm or vacuum leak can cause that. I'm not expert but my truck had a vacuum leak which kept me from switching from vent to vent, it was blowing out of defrost all the time till I fixed the leak...

 

[55trucker]

Is the blower motor spinning at the proper rpm for all 4 settings?

 

[wildbill23c]

My 88 Bronco 2 has this same problem. I haven't pulled the blower motor yet, I'm thinking possibly clogged up with debris and such. Notice this mostly though in the summer with the AC running, works fine when you are driving but stopped in traffic it doesn't blow as well and I can't switch to recirculate as the cable I assume is bound up as it won't move, that or the blend door is blocked by debris...something I seriously need to check HAHA!!!