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Why would a car be blowing hot air then turn to cold?

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2011-09-13 17:15:35
2011-09-13 17:15:35

Good change a plugged heatercore. When it runs, feel the two hoses going into the firewall that carry coolant. If one is smokin hot and the other isn't, then that's the problem. Post you results.

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Is it blowing cold air only or not blowing any air at all.

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Is is blowing hot air on the drivers side, or nothing at all? If it is blowing hot air even though you have the thermostat set on cold - it could be the heat actuator. It will occasionally do this after about 75000 miles or so. Mine started at 114000 miles and if you turn it off and turn it back on - it will start blowing cold again...$400 repair. Hope this helps.

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if its blowing, but not blowing cold its low on coolant. it takes r134a.

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It froze up! Turn it off for about 30 mins or so and then turn it back on. Once you notice the air still blowing but not really so cold, turn it off for a bit.

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If your air conditioner is running outside by not blowing cold air inside through your vent, your indoor coil is frozen. You will need to turn everything off and allow the unit to thaw out.


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