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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 29457
Experience:  GM Grand Master Technician 2007. 14 years experience.
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GM GMC: the heater in the front of my 2003 Yukon does not blow

Customer Question

the heater in the front of my 2003 Yukon does not blow warm air
Submitted: 2 years ago.
Category: GM
Expert:  GM Tech (Cam) replied 2 years ago.
Hi there, I am Cam. Can you tell me a bit more. Does this impact both front drivers and passengers side? What is the history leading up to this?
Customer: replied 2 years ago.
Yes impacts both sides
Expert:  GM Tech (Cam) replied 2 years ago.
Ok so then is it stuck cold? What is the engine temperature doing?
Customer: replied 2 years ago.
Yes the front stuck on cold the rear heat work fine engine temp 190
Expert:  GM Tech (Cam) replied 2 years ago.
Usually all that is required is the system needs to be re-calibrated 3 times to clean the feedback circuit in the actuator off. This is done by removing the battery for 10 seconds. Attach the battery then start the engine for 3 mins. Shut the engine off and then repeat this 2 more times.
Customer: replied 2 years ago.
Ok unhook both pos and neg on battery or just neg side?
Expert:  GM Tech (Cam) replied 2 years ago.
Neg alone is fine for now.
Customer: replied 2 years ago.
Ok will give it a go thanks
Expert:  GM Tech (Cam) replied 2 years ago.
Let me know what happens.