02 Tahoe heater will not cool off

Old 01-23-07, 10:12 AM
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02 Tahoe heater will not cool off

02 Tahoe 5.3 4WD. Heater and AC work great the problem is when you go from heat to less heat. Heater will not cool off nor can you get AC to com on while driving down highway. If I stop and turn off ignition for 5 min. I can turn AC on to cool off vehicle and it work just fine. I can then switch back to heat and it will work, just cannot turn temperature down after that without turning off ignition.
Old 01-23-07, 02:20 PM
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The easiest thing to do at first is remove the "blower motor" fuse from the fuse box. Usually it's in the #1 spot and it's a green 30amp. Check your manual for proper location.

Pull this fuse out with car off, for 10 mins.

Install fuse, start vehicle for 5 minutes with Heater/AC off.

This should calibrate the HVAC system, specifcally the blend door actuator.

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