I started up my truck this morning and let it warm up. I got in and it was blowing cold air. It will pulse a little warm air then blow cold then warm then cold. Anyone having this wierd problem? I can't get it into Les Stumpf for a week!

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2000 F-150 XLT Supercab 4x4
5.4L Engine (Built 8/19/99)
Off-Road Package
3.55 Limited Slip
Alpine CD Stereo/Polk Audio Speakers
K&N Air Filter
Eagle Cap

 

First off make sure radiator collant is up to level. Have seen it with 4.6 engine where coolant level would be low and no hot coolant flows through the heat exchanger. Thus, low heat.....

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"There is no hunting like the hunting of a man and
those that have hunted armed men long enough and
liked it, never care for anything else thereafter."
E. Hemingway

 

I had the same problem in my truck not too long ago. I just tried to get some heat out of my truck in the mornings to defogg the widshield. I wound up taking mine into the local dealer as it was under warranty and they had to replace the air temp dial in the dash. My dial also, felt funny when I turned it back an forth. It had no resistnace over 3/4 of the turning motion. I also wondered if it cuased a vacuum leak also as i was sucking a little more gas at that time.

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red994x4sport XLT K&N New 2000 5.4L engine step bars toolbox bug sheild

 

Co-worker had same problem on her turbo-Volvo. Coolant reservoir was empty... Hhhhhhhhmmmmmmmm....

Put about 1 gallon of coolant in and the needle went back to the middle and she gave heat!

This girl drove her car with the needle BARRIED in the red zone. She thought the gauge was broken. I wonder how much damage she did?

 

Red... I believe that the temperature control **** is electrical and does not operate vacuum. The function-select **** does control vacuum, however.

--Steve


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1998 F-150 SuperCab XLT 4x4 w/ 5.4L, AirAid FIPK, Gibson SS "Cat-Back" Performance Exhaust, SuperChip.

 

Thanks, I really appreciate the info. It has plenty of in the resevoir. It goes to the dealer on the 3rd, even though it isn't doing it anymore. I will post the fix when I get it back.

1stFord

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2000 F-150 XLT Supercab 4x4
5.4L Engine (Built 8/19/99)
Off-Road Package
3.55 Limited Slip
Alpine CD Stereo/Polk Audio Speakers
K&N Air Filter
Eagle Cap

 

Sorry to hear about your problem but so far my heat has been working fine.

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2000 F150 XLT Reg. cab
4.6 Triton Engine
4x2 3.55 rear end gear
sliding rear window
automatic keyless entry
white styleside short box