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Check coolant level and strength of antifreeze. Antefreeze that is too strong in a vehicle will not heat good. If that is fine replace thermostat with a 190 degree one and try that. If it still doesn't heat check heater core for blockage, flush out or check fins for debris.

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โˆ™ 2006-03-18 22:51:00
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Q: Why would a heater only blow out low heat when set to max?
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