Question about 1996 GMC Savana
Blower only comes out bottom heater will not switch to vent or defrost
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
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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Posted on Jan 02, 2017
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