Rear AC blowing cold air (2000 Tahoe 5.3L)

[dharmer1975]

My wife's 2000+ Chevy Tahoe LT 5.3L is blowing cold air when the heater is turned on. The front heater vents blow hot, but the rear never approaches anything more than a little warm. I swear I saw a post on hear about a year ago about a similar problem someone was having, but I can't find it after searching for an hour.

 

Does anyone know how to improve the performance of the rear heater on late model tahoes/burbs/yukons? I swear it worked decent (not great, but better than nothing) when we bough it a few years ago. Thanks.

[plainvanilla]

It could be a duct hose loose or otherwise leaking the hot air out.

[dharmer1975]

It could be a duct hose loose or otherwise leaking the hot air out.

 

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I suppose that's one thing I could check--where are they located? It seems like in the lost post that I can't find, someone had found a way to remove or modify something in the rear heater assembly to make the whole rear heater more efficient and effective. Thanks.

[LogixRat]

Does it have dual heater cores? If so, perhaps your core needs replaced. Otherwise I would think ducting as already suggested. I guess it could be the control unit as well.

[Markeaux]

There is a TSB on a T connection (or similar) that you can get replaced with a larger diameter unit to allow, I presume, more hot water to circulate back there. I never got mine done, and so the rears never get even half as hot as the front vents.