Heater Problem - Ford Powerstroke Diesel Forum

 
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post #1 of 5 Old 12-13-2010, 06:58 AM Thread Starter
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Heater Problem

I hope this is the right place to post this question, if not please advise me where I can. I have a '99 F250 7.3. The A/C blows great but now that I need the Heater it still keeps blowing cold. I have checked both heater core hoses and both get hot. I have checked the panel/floor vacuum control motor and it opens and closes. I do notice the A/C compressor cycles on and off while in heat mode as well. What else could be wrong or what else can I check. I'm freezing!!!
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post #2 of 5 Old 12-13-2010, 07:11 AM
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check the hot water valve under the hood that is controlled by vacuum. make sure it it open so hot water can flow. also make sure your coolant is full.

2004 F250 6.0 CC 4x4 SCT with custom tunes
zoodad mod, head studs, Home Brew EGR delete, 5" MBRP striaght exhaust, 05 headlight Conversion
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Real courage is found, not in the willingness to risk death, but in the willingness to stand, alone if necessary, against the ignorant and disapproving herd. — Jon Roland, 1976
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post #3 of 5 Old 12-13-2010, 07:13 AM Thread Starter
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Can you give me an idea where that valve is under the hood?
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post #4 of 5 Old 12-13-2010, 07:23 AM
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check your PM

2004 F250 6.0 CC 4x4 SCT with custom tunes
zoodad mod, head studs, Home Brew EGR delete, 5" MBRP striaght exhaust, 05 headlight Conversion
HID Head and fogs.
Real courage is found, not in the willingness to risk death, but in the willingness to stand, alone if necessary, against the ignorant and disapproving herd. — Jon Roland, 1976
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post #5 of 5 Old 12-13-2010, 07:24 AM
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Broken blend door perhaps. It happens all the time in the F-150s and Rangers.

Zach
2000/2006ish Ford F-250 Larryette 7.3 Powerstroke 4x4
5" Sewer Pipe Exhaust (video clip), DIY 6637 Intake, Wicked Wheel'd, De-foiled, Missing EBPV, Edge Juice with Attitude, Few leaves added here and there, 35" BFGs, 16x10 Eagle Alloys, Alpine W200

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