96 Jimmy A/C Problem

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mdavis84 - 28 Aug 2005 19:08 GMT

I have a 1996 GMC Jimmy and the A/C works great except when i go t
accelerate it will stop blowing out the vents that is pointing toward
the driver and passenger and either go to the floor or to the defros
usually the defrost vents and then once i stop accelerating it wil
return to the normal vents. This happens anytime the truck is pu
under load even if its just going up a hill. Any ideas y?

Thanks
mat

--
mdavis8

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Dennis Smith - 29 Aug 2005 16:57 GMT

>I have a 1996 GMC Jimmy and the A/C works great except when i go to
>accelerate it will stop blowing out the vents that is pointing towards
>the driver and passenger and either go to the floor or to the defrost
>usually the defrost vents and then once i stop accelerating it will
>return to the normal vents. This happens anytime the truck is put
>under load even if its just going up a hill. Any ideas y?

The blend doors are controlled with vacuum motors. Under acceleration the
engine has a "no vacuum" situation so all the blend doors go to their
default position. There is suppose to be a reserve vacuum canister along
with a check valve that is suppose to prevent this from happening. I
would check under the hood for a black plastic canister with one or two
vacuum lines connected to it. Thats most likely the problem.

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Dennis Smith

-1971 Trans Am - 455 H.O. - M21 4speed - Cameo white/blue stripe-
< http://ps2page.tripod.com/my71ta/tapage.html >
-1973 Trans Am - 455 - TH400 auto - Buccaneer red-
-1984 Trans Am - 5.0 L - TH700R4 auto - Royal blue/silver aero-
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