Question about 1999 Ford Explorer

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Explorer 4.0l 4x4 temp gauge goes to cold when heater turned on

I have a 1999 Ford Explorer 4.0 4x4. The temp gauge ok, but when I turn on the heater, the gauge goes to cold then goes up a little but then back down to cold.

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  • skiitt1988 Jan 25, 2009

    Thank you your answer. I did that already. Sorry, I should of put that in my question.

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You are going to have to replace the engine thermostat.

Posted on Jan 24, 2009

  • yadayada
    yadayada Jan 25, 2009

    check to see if you see bubbles in the coolant recovery tank when the engine is running.

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I have a 1998 Ford Explorer Eddie Bauer 5.0 V8 and the temp gauge in dash goes all the way to hot after restarting engine but info panel in console says the engine temp is ok. It seems to run like normal...


Although the Explorer I had didn't have the same size engine, I did have a similar problem. Start with looking up the location of the temperature sensor unit. I little Google search turned up a few youtube videos and some links to new parts ranging from around $20 and up. Of course the price is only dependent upon the application so the lower cost one's could be for the smaller displacement models. Judging by your description and the fact that you drove that distance without the engine seizing, this may be the culprit. Good luck.

Jan 31, 2014 | 1998 Ford Explorer

1 Answer

Heater blows cold air and the temperature guage reads cold after driving for 20 minutes


Best case scenario is your thermostat is stuck open. When this happens the engine will take a long time to warm up and will never get up to full temp. Worst case could be a serious problem such as a blown head gasket. If there is no coolent in the engine the temp gauge will not register either.

Dec 15, 2013 | 1999 Ford Explorer

1 Answer

1997 escort temp gauge pulled wire off sending unit temp gauge went to coldso


please state what engine ,diesel endura /petrol or a american big engine as in the europeon scorpio

Nov 16, 2013 | 1999 Ford Taurus

1 Answer

Heater noise when engine is cold


Sounds like either a blend door actuator or temp. door actuator.

Aug 05, 2009 | 1998 Ford Explorer

1 Answer

Engine overheats when heater pipes connected


I think you could be right about there being air trapped in the system.
Or the heater core(radiator) is plugged.
Either way you need a pressurized radiator coolant pump to put the coolant in without air being trapped.
Although,i have seen it done by jacking the vehicle up high enough that the radiator was now higher than the heater core level, and then the coolant was put in.
But this is dangerous to try.

Jan 29, 2009 | 1999 Ford Escort

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