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heater not working..

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Old 10-06-2010, 08:23 PM
Junior Member
Join Date: Oct 2010
Vehicle: 2001 Ford F150
Posts: 2
heater not working..

2001 F150 4.2 V6 heater not blowing hot air. does blow hot air for a few seconds, but then no more heat. turn off the heater and try again in a few minutes and again get a blast of hot air then it cools again. one of the hoses going to the heater core is significantly hotter than the other. backflushed the system and water is passing thru, but only about a 0.25" stream is coming out. am currently running flush thru the system. could it just be that the heater core is plugged...
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Old 10-06-2010, 11:16 PM
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Join Date: Mar 2005
Location: Louisiana
Vehicle: 1999 ford f-150
Posts: 784
Originally Posted by jw1028 View Post
could it just be that the heater core is plugged...
Good chance. Have you ever run stop-leak or anything through your system?
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Old 10-07-2010, 07:15 AM
Junior Member
Join Date: Oct 2010
Vehicle: 2001 Ford F150
Posts: 2
never put anything other than coolant/water. im guessing my next step if the flush doesnt work is to pull the heater core and replace? at least it's back up in the 70's here this weekend...
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Old 10-07-2010, 07:39 AM
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Join Date: Dec 2005
Location: MT. JULIET,TN
Vehicle: 03 4X4 5.4 SCREW
Posts: 2,423
Replace the heater core before you really need it
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Old 10-12-2010, 07:44 PM
Join Date: Mar 2010
Location: Arkansas
Vehicle: 1998 Ford F150
Posts: 54
I just had this problem with my 98 F150......i replaced the water pump and i have heat...my heater core was not plugged or leaking......new thermostat, and blend door is good........try to find an old post from 2006 from a guy called NOHEATDAVE...it deffinitely helped me....good luck
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Old 10-17-2010, 11:19 PM
Join Date: Sep 2003
Location: Delaware
Vehicle: 2005 FORD F150
Posts: 13
If you only getting a fraction of what your putting into the heater core coming out it must be plugged. Is this something recent? Or have you noticed it gradually getting worse? if the heater core is severely clogged you might want to consider just replacing it.
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Old 10-17-2010, 11:19 PM


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