1999 - 2006 (GMT800) Section for all discussion related to the 1999-2006 Chevrolet and GMC trucks.

hot/cold blend door issues

Old Apr 5, 2026 | 3:07 PM
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Default hot/cold blend door issues

stupid forum boots me out all the time.

hvac issues. now hot is cold/cold is hot.
pigtail wired properly at blend door motor
new hvac controller doesent operate blend door motor properly..but old one does...model year on old hvac controller does not match truck ?

tring a ''hvac'' reset, fuses removed and battery disconnected. will try again in a bit after lunch.

anyone else with this system? CABLES WORK SO MUCH BETTER- !!

Last edited by chev2500LS; Apr 5, 2026 at 3:08 PM.
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Old Apr 5, 2026 | 3:10 PM
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[QUOTE=chev2500LS;517949]stupid forum boots me out all the time.

hvac issues. now hot is cold/cold is hot.
pigtail wired properly at blend door motor
new hvac controller doesent operate blend door motor properly..but old one does...model year on old hvac controller does not match truck ?

tring a ''hvac'' reset, fuses removed and battery disconnected. will try again in a bit after lunch.

anyone else have issues with this system? CABLES WORK SO MUCH BETTER, THE ONES IN MY 25+ YEAR OLD CARS WORK JUST FINE....

Last edited by chev2500LS; Apr 5, 2026 at 3:11 PM.
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Old Apr 5, 2026 | 6:42 PM
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hvac reset did nothing. still the same issue-
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Old Apr 6, 2026 | 6:51 AM
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If you are going to replace the actuator, check on the blend doors also. If you have any issues with the doors we sell kits for Chevy, GMC. Check out our website for more information. www.blenddoorusa.com
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Old Apr 6, 2026 | 12:02 PM
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both actuators i have work . new hvac control doesnt move the actuator-existing one to the truck works, but controls are backwards---

blend door moves easily by hand. does not bind.
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