I have a 2000 chevy suburban. the rear vents do not blow hot air when the heater is on and the air only blows from the defrost vents in the front wherever I set the controls at , Karl

Asked by Jan 17, 2015 at 09:32 PM about the 2000 Chevrolet Suburban 1500

Question type: Maintenance & Repair

I have a 2000 chevy suburban. The rear vents do not blow hot air when the heater is on. the front and floor vents do not work at all but the defrost vent does work. Please help me. Karl

2 Answers

535

DEFROST MODE is by design and by law, the failure-default condition when something in the HVAC system fails. You MUST be able to clear the windshield for safety sake, ergo: that's the reason why it does that. The failure of a diverted valve or failure of correct (read: any) vacuum to the whole system results in defrost mode only. I'll need more info and observations by you to give better help. Thanks.

535

* diverter valve - sorry for my ignorant spell checker.

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