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'03 Trailblazer rear heat blows cold
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waterskiier78
New User
Jan 6, 2010, 2:53 PM
Post #1 of 2
(5943 views)
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'03 Trailblazer rear heat blows cold
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I have a 2003 Trailblazer EXT LT, with the inline-6 engine
Problem: front heat works just fine, but when I turn on the rear it blows out cold air, I'm not sure if it's relevant, but the a/c also didn't work this summer, front or rear, tried addin R-134, but it didn't help, and now this problem
any help I can get with this would be great, thanx
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steve01832
Veteran
Jan 7, 2010, 2:42 AM
Post #2 of 2
(5935 views)
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Re: '03 Trailblazer rear heat blows cold
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Under the vehicle you will see two metal cooling lines. Let the engine warm up and turn the rear heat on. Crawl underneath and touch the lines. If they are both hot, the problem is in the rear heat ducting unit. If the lines are both cold, follow them back to the engine and check for a valve that would shut the coolant off to the rear heater when you select A/C. The valve could be sticking.
Steve
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