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What would cause my 99 Grand Cherokee heater to stop switching heat vent location Turn on defrost nothing turn on floor nothing etc. blower is working fine just switching of venting direction?
Wiki User
∙ 12y ago
If it's a Laredo, you probably have a vaccum line that has come off or broken. Vent switching is controlled by vaccum in these models. The main vent line comes off of the driver's side of the intake manifold. These are notorious for either slipping off or breaking.
Wiki User
∙ 12y ago
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You have a leak in the vacuum supply to the ac control.
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Sorry i can't help u with this😔
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you need to replace the vacuum.
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