very little blowing and no defrost switch

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674 - 02 Dec 2006 12:46 GMT

i have a 93 Chevy Cavalier 3.1 with no heat. I just got the car this
last summer, and never need heat till it got to winter . I can turn the
heat on full blast, i get some air flow on high . I cant switch it to
defrost to heat to anything . the only heat i get out it through the
vents , the air flow is not strong at all, take me sometimes 30 -40 min
to defrost windows . Do i have a block vent , bad switch , or both,
what are my steps on checking stuff 1st , . i know i have a good
therastat. the heati do get out is hot / very warm . Please help in
Northern Wisconsin with out heat.

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Noozer - 02 Dec 2006 13:45 GMT

>i have a 93 Chevy Cavalier 3.1 with no heat. I just got the car this
> last summer, and never need heat till it got to winter . I can turn the
[quoted text clipped - 5 lines]
> therastat. the heati do get out is hot / very warm . Please help in
> Northern Wisconsin with out heat.

Airflow blocked at the heater core. It's easy to remove the blower motor,
but I don't know if you can get a vacuum hose in to suck out the blockage.
The alternative is to pull the heater out from the inside which is a LOT of
work.

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Bobby The D - 02 Dec 2006 22:37 GMT

> Airflow blocked at the heater core. It's easy to remove the blower motor,
> but I don't know if you can get a vacuum hose in to suck out the blockage.
> The alternative is to pull the heater out from the inside which is a LOT of
> work.

You can get at the front of the core by partially removing the ducting
behind the engine (or at least you could on a '90...I think they're
pretty much the same). I had the same problem with mine & the core was
completely plugged with all sorts of junk & fuzz. Might be a little
tough to get at with the 6 though...mine was a 4.

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Kevin Bottorff - 02 Dec 2006 22:50 GMT

>> Airflow blocked at the heater core. It's easy to remove the blower
>> motor, but I don't know if you can get a vacuum hose in to suck out
[quoted text clipped - 6 lines]
> was completely plugged with all sorts of junk & fuzz. Might be a
> little tough to get at with the 6 though...mine was a 4.

you have a vaccume leak. fix the leak which may also let the air door
work which may also fix the air flow problem. KB

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Mike Romain - 02 Dec 2006 15:01 GMT

I think your controls are vacuum activated. I would be looking for a
vacuum line off the top back of the engine someplace.

Do you hear any hissing from under the dash when you try the defrost?

Mike
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> i have a 93 Chevy Cavalier 3.1 with no heat. I just got the car this
> last summer, and never need heat till it got to winter . I can turn the
[quoted text clipped - 5 lines]
> therastat. the heati do get out is hot / very warm . Please help in
> Northern Wisconsin with out heat.

Reply to this Message