Question about 1996 GMC Savana

2 Answers

Heater blower does not come out vents

Blower only comes out bottom heater will not switch to vent or defrost

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  • adamlake007 Jan 05, 2009

    i have a 97 gmc savana. there is air coming out of all the vents. the unit will not change to defrost or to heat. and of course it is a safety item and i need this van on the road so i can work. the van does not have ac so it is a diff air box from the ac unit. i checked all of the vacum lines, vacum reservoir and have found no leaks. now the garage says to change the blower motor relay. but that doesnt ring a bell to help my problem. thanks for any input because im baffled with this. God bless.

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2 Answers

I had the same issue and it was the vacuum hose that goes over the alternator to the ac unit

Posted on Oct 30, 2008

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  • 5,568 Answers

Check your vacuum lines under the hood and particularly the vacuum reservoir which is a canister that supplies a reserve on vacuum to bridge the times the engine is pulling hard. These often have plastic nipples with pushed-on hoses that can snap off.
The directional control of air flow is most often accomplished with vacuum 'motors' that move vanes to change direction. 

Posted on Sep 21, 2008

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