Question about 1998 Ford F150 Regular Cab

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Heater problems heater not getting hot. have flushed and put in new thermostat.

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The problem may be the switch that controls the temp of the air. It may be out, or the servo it controls may be out. To test this you have to take a lot apart as the servo is located inside the heater box. I would have a mechanic look at it. It could also be a bad heater core. Water leaking into the floor is a good sign of a bad heater core.

Posted on Dec 22, 2008

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Have heat but not hot new thermostat new hoses flushed complete system and now gets warm but not hot


could have air lock or heater core plugging up. heater cores should be back flushed.when car is hot touch one heater hose at a time both should be fairly hot if both hot then the problem is temp control.

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If you flushed the coolant with the thermostat in, chances are you didn't flush the coolant. Regardless, it's easiest to check the controls inside first. Does the blower fan work? Does the air flow change from floor to vent, to dash as it's supposed to? Does the A/C change temps when knob is turned from cold to hot? Post results.

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The heater gives a little heat but, not hot air. F-150 4x4 4.6 L engine After warm-up the heater puts out a little warmth but, that is it. It will not get hot like normal during daily operation. I have...


Flushing the system and adding new antifreeze would have been my first suggestion, so, thanks for mentioning that.

We should check a couple of other things.

1. Start the engine, let it run for 6 to 8 minutes, ( with the heater off ), to allow the engine to reach normal operating temperature. Then, turn your heat and fan wide open, then listen to the engine to see if you hear a click, you should be able to hear the thermostat open up to circulate the coolant. If you do not hear a click, you may have a stuck, or partially stuck thermostat.

If the thermostat doesn't open, the hot water/coolant will not flow in to the heater core.

2. In the back of the engine, on the fire wall, locate the inlet and outlet hoses to the heater core. They are both usually about 1 inch in diameter. Carefully feel each hose. Both should be hot. If only one is hot it's because you have blockage somewhere preventing the circulation of coolant to the heater core.

The most common area for blockage is in the heater core itself. Sometimes flushing doesn't clear it out.

I hope this will help you resolve the problem.

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