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Bill, Chevy Technician
Category: Chevy
Satisfied Customers: 1776
Experience:  GM Certified Master Technician
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my silverado makes a clicking noise under the dash but yesterday

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my silverado makes a clicking noise under the dash but yesterday only one side would put out cold air the other side hot,a restart would solve the problem with the air but it still makes a clicking noise,what could it be

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THis is commonly caused by a failed a/c temperature actuator. When the actuators internal sensor fails, the actuator will often move back and forth and "hunt" for the correct position. Which side of the dash was it blowing hot on? The left side is relatively easy however if it is the passenger side, it requires dash removal to access.




Customer: replied 4 years ago.
that is what i ask for, the part i mean

I was asking which side of the dash was blowing hot... the left or the right side?

Customer: replied 4 years ago.
Left side


There are several actuators in the dash however your left side has failed, should be replaced, and is likely the noise as well. Remove the screws from the right side under dash hush panel if your truck has one. The actuator is on the bottom near the center of the hvac case. There are two 5.5mm screws that hold it on. You can also put your hand on the actuator when the noise is present and feel if that is the actuator making the noise.





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Customer: replied 4 years ago.

Hopefully it was the same actuator making the noise as causing the hot air on the drivers side.





Customer: replied 4 years ago.
Do I have remove dash
For the left side? No, just the hush panel and the actuator as in the pictures above.