2003 gmc envoy no vent on heat or air


Old 02-10-09, 01:00 PM
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2003 gmc envoy no vent on heat or air

2003gmc envoy im told there is a relay for heat or air to come out of vents.mine only blows on floor & or winsheild where is it located ?does it need to be programed ?
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Old 02-10-09, 03:44 PM
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Pull your blower motor/HVAC fuse for 10 mins then reinsert. This should reset the system if it is able. If not, sounds like a mode door issue.

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