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The first possibility is the thermostat didn't work. To find this out, after the engine is warmed up u check the hoses going from the engine to the heater, they should be hot. if they are hot then the next reason would be a cable to the temp on the heater needs to be adjusted or the heater core is plugged inside or out.

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โˆ™ 2005-01-08 13:06:26
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Q: Why is only warm air blowing when heat is on full after putting in a new thermostat?
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