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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15181
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I have a 99 Chevy Tahoe LT and the front will change from

Customer Question

Hi, I have a 99 Chevy Tahoe LT and the front will change from hot to cold on the HVAC but the rear only blows AC cold air and not hot. I have done the following prior to the failure. Changed the orifice tube, changed the accumulator and recharged the system. I also flushed and refilled the cooling system. After completing this the rear system failed to blow warm air. Is it a air director and where would it be or is the heater core plugged?
JA: Most vehicles have two fuse panels. Do you know what they look like?
Customer: I know about the one on the driver side dash
JA: Are you fixing your Tahoe yourself? What have you tried so far?
Customer: Yes, I have opened the back panel in the rear area of the vehicle where the ducting is and could not find an air director.
JA: Anything else you want the mechanic to know before I connect you?
Customer: Other than what I listed on the first message is all that I did prior to it stop working.
Submitted: 3 months ago.
Category: Chevy
Expert:  kalamykid replied 3 months ago.

Are both of the rear heater core lines getting hot?

Customer: replied 3 months ago.
I am not sure where the rear heater core lines are located? I can only see the two heater core hoses that run through the firewall to the front heater core. The only lines I see that run to the rear are the AC lines. The front heater core lines do get hot.
Expert:  kalamykid replied 3 months ago.

The heater core lines will run under the truck along the passenger side of the truck and should run along side the rear ac lines.