O/T Chevy Silverado air system

Larry O · Dec 8, 2012

This has me stumped 1998 Silverado with little to no air coming from the vents Fan is working you can hear air moving somewhere but not to the vents. There is no change in volume when you go from hot to cold but you can feel the heat difference. I have had the bottom off most of the duck work looking for a blockage or a stuck door but so far nothing any Ideas would be greatly appreciated
Thanks Larry O

DannyE · Dec 8, 2012

What year? My "02 has a filter on the bottom, by passengers feet,not too bad to replace,mite try that. Dan

Anonymous-0 · Dec 8, 2012

If you can hear the fan blowing, the door is stuck.

Larry O · Dec 8, 2012

Lance I’m with you
but like I mentioned I have had the bottom of everything inside and all the doors I can find move and make no difference in air flow. I was hoping there was one somehow hidden that I’m not finding.
Larry O

Larry O · Dec 8, 2012

Dan mine is a 98 and my Haynes book doesn’t show scat about the duct work I have not seen a filter but will look and post back
Thanks Larry O

ray hofstetter · Dec 8, 2012

No air ANYWHERE? Maybe "squirrel cage" came loose/broke on the fan motor?

Greg1959 · Dec 8, 2012

Mouse nest????

ShadetreeRet · Dec 8, 2012

Those Haynes manuals don't even make good toilet paper! But seriously, if you stop by the parts dept. of your nearest dealer, (providing you are on speaking terms), they may show you the breakdown on the computer, Especially if they think they may sell a part.

Ronald Anthony Anderson · Dec 8, 2012

The switch that controls vent,defrost, heat, air conditioning probably went bad for you. They are noted for doing that. Its hard to find one in a junk yard. 50-75.00 used

casecollectorsc · Dec 8, 2012

Around here they tell you, could be this, could be that, bring it in we will look at it. Don't think so!!

Tim in OR · Dec 8, 2012

any chance a vacuum line has collapsed?

brian brooks · Dec 9, 2012

Look it up online some rides have problems with the blend door.

Allan in NE · Dec 9, 2012

Cab Filter plugged?

Allan

MisterT · Dec 9, 2012

(quoted from post at 14:44:31 12/09/12) Cab Filter plugged?

Allan

I have an '01 that I bought new. I never did think the heater/AC worked as good as it should. A few years ago I learned there might be a filter in there, so I went looking, found it, and yes it was dirty. I pulled it out, put the door back on without a filter, and now the system works just like I always thought it should have. Apparently those filters are quite restrictive even when new.

Unless a truck is being operated in extreme dusty conditions all the time, I see no need for that filter.

tedregentin · Dec 9, 2012

Do you expect a shop to diagnose a problem over the phone?

bradk · Dec 9, 2012

No cabin filter on a "98.

I"d bet you have blocked airflow at the AC evaporator.Very common especially in farm trucks where dust and debris get sucked down the outside air intake.

Take out the blower motor and use an air gun with a bendable wand(copper tubing works good)and carefully blow out the inlet side of the evap core which is right ahead of the heater core without getting too rough.There should be a screen attatched to the core,you can take that out and leave it out as it seems to contribute to the problem.

O/T Chevy Silverado air system

Larry O

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DannyE

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Anonymous-0

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Larry O

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Larry O

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ray hofstetter

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Greg1959

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ShadetreeRet

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Ronald Anthony Anderson

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casecollectorsc

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Tim in OR

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brian brooks

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Allan in NE

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MisterT

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tedregentin

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