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heater problem

Old Jan 2, 2006 | 10:40 AM
  #1  
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lawson#1
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Unhappy heater problem

Hi, first time user here. I have a 1990 f150 4wd w/5.0 in it. The heater in it used to cook me, now I cannot get any heat. I put in a new thermosthat, BOTH heater hoses are very hot to the touch, top rad hose is hot (had the heater core flushed) yet when I turn it on I get cool air out of the defroster, and luke warm heat at the vent. The water level is topped off. If I flip the lever to A/C it gets really cold, showing that that is working! I am stumped!!!!!!!! ANY SUGGESTIONS?
 
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Old Jan 2, 2006 | 11:03 AM
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you might have gotten a bad thermostat or possibly put it in backwards start your truck and take the cap of the ratiator and see if the cooliant starts moving right away if it does you got a bad thermostat
 
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Old Jan 8, 2006 | 12:09 PM
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Heater Resolution

It sounds like some fell in the defrost vents and is jamming the door. I had the same issue (no heat) and when I opened the heater up, I found a pen jamming the door open. It did not affect the control portion at all.
 
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Old Jan 8, 2006 | 04:33 PM
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Old Jan 21, 2006 | 08:44 AM
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From: shelocta, pa
how do you get the heater apart?
 
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