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Heater blowing out cool air - 1999 Jeep Cherokee

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Faulty thermostat will cause overcooling by staying open at all times.to check this.crank up vechicle until it warm up.becareful watch out for drivebbelt and cooling fan.feel all hoses.plus heater core hoses all hoses should be hot when engine warm up.if engine run until it get hot all hoses feel luke warm thermostat is bad. if all hoses get hot.check your fuses to HVAC mode switch.if all is good.you have a faulty heater air door or it could be stuck.your heater cores could be restricted stopped up.if you have climate control this is a dealership fix.

Posted on Dec 14, 2009

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1 Answer

Heater blows cold air


This is from Lifewire: If your heater was blowing lukewarm instead of cold, a thermostat that was stuck open would have been a potential cause. Another common problem is when air gets into the cooling system. Since the heater core is often the high point in a cooling system, air can move into it and become trapped.

Try this site too: https://axleaddict.com/auto-repair/Why-Are-My-Car-Heaters-Blowing-Out-Cold-Air

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