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Sounds like it could be a possible bloked heater matrix try removeing connecting hoses a jet-wash the matrix out both through the inlet and outlet until water flows free. The motor for the temperature door in the plenum isn't working. As you increase the temperature control on the dash, it sends a signal to a motor which opens the door to the heater core. Yours is sealing off the heater and allowing AC or fresh air only.

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โˆ™ 2004-11-12 22:25:51
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Q: Why would a 1998 Blazer blows cold air when the heater is on and the engine temperature is around 190?
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