Question about 1998 GMC Safari
Vent selection stuck on Defrost, selector knob rotates but air flow stays to defrost vents. Posible vaccum hose leak or disconnect? How do I locate where and which hose to check/replace?
Along the fire wall follow the vacuum line. it is very small 3/32? and made of plastic which deteriorates over time. best to buy a rubber piece that fits over the plastic and link the two pieces together
Posted on Oct 25, 2008
You're right commuter, it is a vacuum hose leak or disconnect.
start from the selector switch. take the bundle of hoses at the back of the controller and feel if there is a vacuum source.( the engine should be idling).
if there is then it could be a faulty selector.
if there is none. trace the hose that went outside of the firewall.
that is the vacuum source and you should be able to trace it to a vacuum tank. look for broken hoses or rusted tank.
tnx 4 using fixya,
Posted on Sep 13, 2008
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Posted on Jan 02, 2017
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