Heater Problem

Oct 17, 2003 4 Replies
Q

I have a 92 F-150 with a heater (or might be a vacuum problem). When I drive faster than a certain MPH (about 55) then the air that is coming from the heater switches from blowing on the floow (where I want it) to blowing on the windshield (the defrost setting). I have no control over this other than lowering my speed. No combimation of settings seems to make a change (other than off).



I am pretty sure this also happens when the air is cold, but haven't tested with the a/c as I don't use the a/c.



Anyone have any idea what I can fix? I would really like the air to blow here I want it to blow.



Thanks,



Joe.


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D

"qwest" wrote in news:oh_jb.234$ snipped-for-privacy@news.uswest.net:

You have a vacuum leak somewhere. The engine has less vacuum at higher speeds, and the vacuum switch isn't getting enough to operate properly.

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J

not familar with ford trucks but have been messing with ford cars for a long time.. probably a vacuum line leaking on the back of the heater... when you speed up you loose vacuum(just like the old time vacuum controled windshield wipers would stop when you speed up and you would have to ease up on the gas to let the wipers work so you could drive)... your vacuum system is probably controling the heater and you either have a leak or bad vacuum motor??? hope this helps.

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S

----------------------------------- It is most likely a vacuum leak. Look under the hood first. The heat of the engine will cause lines to harden/fail.

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Q

All-

Thanks for the info. I will take all the suggestions and look to see what the problem is.

Joe.

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