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Jerry Newton
Jerry Newton, Chevy Technician
Category: Chevy
Satisfied Customers: 4413
Experience:  ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
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2004 chevy Silverado heater controls will not change modes,

Customer Question

2004 chevy Silverado heater controls will not change modes, I have changed actuator tried a known good control head tried relearn still no movement from mode actuator?
Submitted: 1 year ago.
Category: Chevy
Expert:  K. Wiggins replied 1 year ago.

Hello, does it have manual or automatic climate control?

Customer: replied 1 year ago.
manual control
Expert:  Jerry Newton replied 1 year ago.

Do you have a multimeter and know how to use it?

Customer: replied 1 year ago.
Expert:  Jerry Newton replied 1 year ago.

OK, good, we'll come to that testing here in a minute.

First, which modes don't move? Hot/cold? Defrost/floor/dash vents? Or none of them?

Customer: replied 1 year ago.
defrost/floor/dash
Expert:  Jerry Newton replied 1 year ago.

OK, and you replaced the mode actuator? Are you positive that you replaced the correct actuator? It should be near the gas pedal.

Customer: replied 1 year ago.
I removed the mode actuator,plugged in new one no response when modes are changed a friend loaned me his known good control,did the relearn no movement from actuator
Expert:  Jerry Newton replied 1 year ago.

Did you plug in the mode actuator without it being attached to the airbox?

Customer: replied 1 year ago.
I did try the actuator while it wasn't connected to the air box
Expert:  Jerry Newton replied 1 year ago.

OK, the actuator is no good then. You cannot plug that actuator in until it's installed, because it will over travel and wreck the internals.

You need another new actuator.

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