its definitly your heater core, I have the same problem with my 88 TC I bypassed mine for now but I am going to change the heater core soon, I know that you have to drop the steering column and pull the dash out a little to get to the heater box I dont know if the chilton shows how to do it.. I have the Haynes repair manual and its about as worthless as a car with no engine. I'll change my heater core and let you know what I run into and give you some pointers of what to do. hope I can help...
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