No heat through any vents

INSEPPID

MEMBER
2005 BUICK
3.8L
6 CYL
FWD
AUTOMATIC
86,000 MILES

I get no heat through any vents. Good air flow through all but no warm air. Have good flow through heater core. Does the actuator behind glove box control air flow over heater core? Also can I put cc in diagnostic enter the 02 and look for a 10 or 11 trouble code? Not sure if 02 is HVAC mode.

4 Replies

HMAC300

MECHANIC
48,601 POSTS

Try pulling HVAC fuse inside car with key on for sixty seconds it should re-calibrate actuators then if still no heat have it scanned for codes to see if anything is wrong the feature for self diagnostics is no longer there. So a mechanic will have to do it. It does not need to be a dealer long as mechanic has a pro scanner.

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Thursday, October 27th, 2016 AT 6:00 AM

INSEPPID

MEMBER
5 POSTS

Thanks hmac300, will check it out. Friend has a pro scanner.

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Thursday, October 27th, 2016 AT 6:29 AM

INSEPPID

MEMBER
5 POSTS

Re calibrate worked! I did not mention that in August I was away from home and those plastic elbows had started leaking, used stop-leak crap to get me home, then replaced plastic water elbows. As a precaution after have put the stop-leak crap in I flushed core and radiator. Did not need heat until last week. Guess I should of re-calibrated HVAC after repair in August. Thank you. Did re-calibrate clear trouble code? Does it matter?

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Thursday, October 27th, 2016 AT 10:30 AM

HMAC300