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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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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If everything appears ok but no heat. "Air Lock" is the most likely cause. (With interior heater set to full heat) Solution; 1. Make sure water pump works. 2. Drain about 1/2 engine coolant into container. 3 Remove both heater hoses from engine side and flush heater core in both directs through heater hoses with garden hose. 4. Reattach heater hoses in correct locations. 4. Refill engine with coolant. 5 Start engine and run for 2 min., use caution when topping up coolant.
6. Most 2000 GMC have twist off caps with plugs located mid way on heater hoses. with engine cold, start engine these caps may be loosened to allow trapped air to escape. Do not attempt with engine hot due to hot coolant injuries. This may take more than one attempt to remove all air from heat system. 7. Lastly most 2000 GMC water pumps have a bleeder plug,( 3/8" square driver plug) located on the water pump. With egine cold this plug should be removed to remove any air. Reinstall plug with thread sealant.
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My 2001 ford explorer with auto temp controls is only blowing cold air when the heater is on and temp set at 90. There is plenty of water in the system so i am not sure what it could be other than the...

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Water pumps can stall out, but do you have air trapped in system.
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