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Re: 89 c/k 2500 4x4 has no heat
check blower motor (pass side, foot well, under glove box). Mine went 3 years ago. Autozone sells motor, about 1 hour install time. I have aquired "mitchel 1" auto diag software for all gm 83-02. Excellent software! Goes through step by step diagnosis (flow chart). email me if you need me to help you further.
Leon
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