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I would check to see if your heater core is plugged. I recently had the same problem and I flushed the heater core with fresh water from both inlet and outlet hoses(I used a garden hose with one of those nozzles that you can change the water pattern and set it on full). That fixed the problem for me.

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Q: Your 1993 S-10 blows out cold air when the heat is activated what and how do you fix the problem?
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