Question about 1999 Ford F250 Regular Cab

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I have a 1999 Ford F250. Sometimes the heater will work and then when I shut the truck off the heater will not work the next time I start the truck. I thought it was a loose connection because I was driving on a dirt road and it came back on. If it's not working when I first start the truck, It sometimes will come on after 10 minutes or it may take a couple days before it decides to work.

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  • adavis83686 Feb 01, 2010

    This at least gave me a starting point to look for a solution. I did however discover that when I unplugged the blower from under the hood that the plug was broken. I had checked that before and didn't notice that. I replaced it and now the heater works fine.
    Thank you

  • ezriders4 May 11, 2010

    I assume you mean the blower motor is intermittently inop (no air flow)when you say my heater is not working. if this is correct the heater control valve or the temp control actuator has no influence on blower motor operation. (and you gave him three thumbs up) I think you need to be looking at the blower motor transistor or blower motor it self. Next time it happens kick the blower motor with you foot (If its accessible from under the pass side of dash) If it instantly comes back on than the brushes are worn out in the motor.

  • Larry Elledge Aug 29, 2013

    yes of course he means the blower motor is working intermittantly. Try changing the B.lower AMoter Relay in the main fuse panel located under the hood. Position 31 on my 1999 F250.



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Could be heater valve if you have 1,also temp control actuator which is in the dashboard

Posted on Jan 30, 2010


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