F 250 heater problems

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Dec 17, 2006 | 02:03 PM

G.J.

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F 250 heater problems

Hi all, my first post here. So here we are in the middle of winter in Montana, and the heater on my F 250 has gone out. This truck is a very early 97 model with the old body style, and has a powerstroke. The heater motor blows, but I cannot get hot air out of any of the positions on the heater control. The AC works fine. I looked behind the glove box and found the little flapper valve which controls the feed of hot air into the duct system, it looks to be operating as it should. Any suggestions as to where to look next? THANX!

Dec 17, 2006 | 04:43 PM

redford

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From: Stephensville WI

Welcome to FTE!

Is your thermostat stuck?

Dec 17, 2006 | 05:34 PM

G.J.

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Thank you!

Thank's for the welcome!...nope, I checked the thermo first thing...not that many moving parts between point a and b, I wonder if there is a relay switch or something of the kind involved?

Dec 17, 2006 | 07:45 PM

G.J.

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Traced it down to the heater core...warmed things up and the input line is warm, while the return stays cold even after cycling the controls...oh well!

Dec 17, 2006 | 11:13 PM

whalerron

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Joined: Jan 2003

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From: Baltimore

You should try backflushing that heater core with a garden hose. I have had a problem similar to yours in 2 vehicles and both times, the reverse flush fixed it without causing any leaks.