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Originally Posted by jimkubiak
I have the same problem with my 89 Vette. If you felt the heater hoses and they are hot you more than likley do not have air in the system. These models sometimes need to be blead at the small hoses going to the TPI and intake.
If the hoses are hot at the heater core, the problem might be at the programer or temperature valve actuator valve. I will let you know when I work on mine on Friday.
Let me know if you hear from anyone else.
Thanks, Jim
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Thanks for the input, Jim. I am continuing to poke around with it. If I figure anything out, I'll let you know and I look forward to anything you find out. My instinct at this point is that the mechinism that directs the air for cooling or heating is malfunctioning. But I don't know enough about the specifics of the system to pin it down.
So far yours is the only reply.
Thanks again, Steve (islandVette)