Question about 2003 Ford F250 Super Duty Crew Cab

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Manual heating system with automatic trans. 7.3 L Diesel, 45k miles

When driving in cold weather with heat on. Heater temp will go to cold, air flow is fine and engine temp seems to stay in the middle. This will happen a couple of times when highway driving.

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  • shallowjon Jan 21, 2009

    truck will not make any heat untill u rev it to 2000 rpm or more. full of antifreeze

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  • 39 Answers

It may be your thermostat, the gauge on the dash is a dummy gauge, there is only three positions that it sees, dead cold, operating temp, and hot, so even though the needle looks fine it just means it s closer to operating temp then it is to cold,

Posted on Oct 06, 2008

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