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sprinkles08
sprinkles08, ASE Certified Technician
Category: Chevy
Satisfied Customers: 21601
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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2007 chevy 4x4v tahoe after along drive the front a/c sounds

Customer Question

2007 chevy 4x4v tahoe after along drive the front a/c sounds like something is blocking the air from coming out of the vents. if you turn the car off for a few minutes it works fine for a while then does the same thing
Submitted: 1 year ago.
Category: Chevy
Expert:  sprinkles08 replied 1 year ago.
Hello and welcome to Justanswer!
If the blower motor still runs at a normal speed when this happens then the issue is a physical blockage in the heater box. It could be a door issue but it's more likely to be debris or ice. There could be debris in the heater box such as from a rodent nest.
The fact that airflow comes back after shutting it off leads me to believe the issue is ice though. If condensation isn't draining from the heater box quickly enough it can start to form ice on the evaporator. The longer it runs it will accumulate more which will block airflow. Shutting the a/c off allows the ice to melt so airflow returns. If this is what's happening then a restricted heater box drain is most likely.

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