Yet Another Heat Issue
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Yet Another Heat Issue
Ok so I have a 1999 F-150 5.4, as I was driving today I noticed that when I moved the temp. control to the cool side nothing really happened. If i kept it there it would blow semi cool but not fully cool. I also noticed that when I shut the truck off and switched it I could here the blend door switching too. Once I started it it would blow cool air but as soon as I switched it to heat it would blow hot but when switched back to cool it would only be semi cool again. I'm guessing the blend door is sticking. Please help
Hotshot
Joined: Jul 2005
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you want to make sure the **** is not slipping on the shaft first, but if temp changes from hot to cold and you did not move the ****, then the door is a good bet. seets between the radio and the transmission hump. take the plastic dash panel off and look for motor drive. motor can be bad, lever can be bad, gear reducer on motor can be bad.
Hotshot
Joined: Jan 2004
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From: St Louis
Coolant goes through the heater core all the time regardless of the AC controls unless the system has been modified from stock.
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Posting Guru
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Posting Guru
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not true some vehicles still have the valve
Hotshot
Joined: Jul 2005
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no, the F150 have no such valve. Heater is always hot. You blend the air temp by mixing cool air with the always hot heater air. I would not say "all" new cars and trucks dont have a shut off valve, but "most" would be a good statement.
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