Heater blows lukewarm to cold, how many different areas do i need to look at to fix? - Ford Powerstroke Diesel Forum
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Old 01-23-2011, 02:19 PM
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Heater blows lukewarm to cold, how many different areas do i need to look at to fix?

My 2005 F250 heater is basicly a non heater. At best it blows lukewarm but most of the time it blows in the 50 degree range. My wife refuses to ride in it. I do have a egr bypass installed. The radiator is full and i have no issues with coolant loss. 160,000 miles and never a issue with the heater. Truck runs fine with no issues besides no heat and my ABS is non working at the moment.

What areas do i need to look at? The black flow control valve by the passenger side seems operational.

The A/C works fine, i can adjust the temp with a turn of the dial.

Thanks for the help.
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Old 01-23-2011, 02:45 PM
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The inline valve is not a back flow control, but a valve that closes off coolant circulation to the heater core to get the cab cooler when using the A/C.

There should be a gray vacuum hose that connects to it.

You could also get the truck up to temp and feel the heater hoses, the hose with the valve is the inlet hose and the other the outlet. See if they feel the same heat temp. If there is a noticeable diffrence, you may have a bad inline valve that isn't opening, air pocket, or blocker heater core.

If both hoses feel the same in temp, you may have a blend door that is not working properly.

Edit: is the coolant in the degas bottle at the proper level?
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Old 01-23-2011, 03:37 PM
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Lilpooh- Thank you for your response. I will check that in a little bit as i have a 40 mile trip i have to make.

The coolant level is fine in my degass bottle.

Do these trucks have thermastat issues? I have had toasty heat for the last 2 winters to be out cold this one.
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Old 01-23-2011, 03:44 PM
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Send a message via Yahoo to Dave
Do you have any way you can monitor coolant temps
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Old 01-23-2011, 10:14 PM
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The valve on the rear passenger side does not have any vaccum going thru it . Does not make any difference wether i have the controls set to heat or AC.

I did install a different radio this summer, any chance i screwed up something at the controls inside?

No way to monitor the temps. I do have a point and shoot temp gun.
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Old 01-24-2011, 05:04 AM
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14mins: I see you live in Aledo. Texas? If so, I live about 5 to 6 miles from you and I have AutoEnginuity in my garage. If you like, you are welcome to drop by and we can run a diagnostic check using AE.
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Old 01-24-2011, 08:39 PM
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duecer- Thanks, i will send you a pm.

I would rather deal with a bad injector as to chase these issues around.
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