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Ask Dave Nova Your Own Question
Dave Nova
Dave Nova, Chevrolet Technician
Category: Chevy
Satisfied Customers: 19451
Experience:  ASE Master Certification. GM World Class Certification
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Set to ac, 2 vents blow heat, the rest blow cold

Customer Question

set to ac, 2 vents blow heat, the rest blow cold
Submitted: 1 year ago.
Category: Chevy
Expert:  Dave Nova replied 1 year ago.

Which vents blow hot? Is your truck a new body style 2007, or Classic body style?

Customer: replied 1 year ago.
classic, drivers side
Customer: replied 1 year ago.
realized today left def. plus rear driver side also hot.have auto function
Customer: replied 1 year ago.
it would seem half is on ac, half not, go figure !
Customer: replied 1 year ago.
blower control module dies every 6 to 7 mnths, replace and fan works normal
Expert:  Dave Nova replied 1 year ago.

The problem is in the drivers side temperature actuator. Once the actuator wears and goes beyond the normal travel limits, the control module goes to a default mode (full heat). You can either replace the drivers side temperature actuator or you can have the dealer reprogram the control module (usually around $100 charge to do this).

Customer: replied 1 year ago.
thank you