Heater sometimes blowing cold air - Ford Powerstroke Diesel Forum

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post #1 of 4 Old 04-15-2010, 10:41 AM Thread Starter
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Heater sometimes blowing cold air

If I set my heat on say 70 it will be warm for a while then starts blowing cold air, if I turn it up to say 74 it blows warm again. When it starts blowing cold it doesnt feel like its up to temperature set on the dash. Doesnt really matter what temp you have it set on. At first I was thinking blown head gaskets but if that was the case I wouldnt think turning up the heat would make it warm again. Any ideas? Thanks, Mike

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post #2 of 4 Old 04-15-2010, 10:53 AM
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Well first thing I would check would be coolant levels and for any sort of leak, particularly if it's blowing straight cold air. After I got my radiator replaced under warranty one of the hoses didn't get tightened and it was looking coolant while I was on the freeway. It was doing the same thing as yours then just went straight cold so I pulled over and found the leak. Coolant and oil temps never really got out of whack either.


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post #3 of 4 Old 04-15-2010, 11:00 AM Thread Starter
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I just had the radiator in mine replaced but it was doing this before and I didnt think to mention it to the dealer when they did the radiator. I havent seen any leaks and the level is a little above the full mark.

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post #4 of 4 Old 04-15-2010, 12:27 PM
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Hmm. I would maybe have the dealer check to see if your temp sensor for the climate control is going bad then.


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