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Well, after a month, our heat is fixed! Turned out that someone before I bought it had put a new water pump on the Tahoe and somehow routed the hoses wrong. The water pump was the last thing that my mechanic suggested, and he saw the problem before he changed it. Thank you for all of the help...

I'm taking it to a shop this week, I'm out of time where I can work on it. I'll let you know how it goes, but my guess is that something in there is broken. Thanks again

The blend motor is turning, but it doesn't make any noise or vibration (by feel) when you switch it to heat. I'm going to see if I pull the radio out if I can get to it. Thanks again for the reply!

Ok, air doesn't get any warmer, if it did very little????

Thanks for the reply. Yes both hoses are getting hot, Tahoe is running like a champ:-) I'll check the A/C test tomorrow. Thanks again.

Hi guys, I've searched the forum for this problem and came across one thread for it. I tried the two recommended things, changed the thermostat and flushed the heater core with CLR. No luck. Antifreeze is topped of, so that leaves the blend door or the climate control panel. Can either one cause...

Welcome, I'm right there with you. I love my 99, but having heater issues. I still have a few tricks up my sleeve. Good luck, I'm sure the people here would be happy to help. Mike

Hello from Benton, Ky. Just picked up a 99 gold Tahoe with 145,000 on her. So far I love it, having an issue with heat, but I'm working on that. Thanks for the add. Mike