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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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