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Guest Message by DevFuse
 

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Heater controls wont switch..


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2 replies to this topic

#1 tidd1340

tidd1340

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Posted 12 July 2006 - 10:20 PM

on my 89 GL. Its stuck on heat,but I want to be able to switch to defrost,bilevel,etc....fan works fine. Is this a vacum operated deal? Where is the best place to start troubleshooting? thanks!

#2 GeneralDisorder

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Posted 13 July 2006 - 12:22 AM

Vacuum hose hooked to the intake manifold has come loose somewhere - trace the hose and find the leak.

GD

#3 NorthWet

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Posted 13 July 2006 - 12:26 AM

Yes, the system is vacuum operated. Perhaps the place to start checking is in the engine compartment, right (passenger side) firewall, there should be a small milky-white plastic vacuum reservoir a little smaller than a soda can. These tend to leak as they age, but also the hoses could be off or damaged, or the one-way valve in the engine-side hose could be missing or backwards.




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