Heater Problem

ptollefsen · #1 (**permalink**) 12-13-2010, 06:58 AM

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!!!

purplehorn1977 · #2 (**permalink**) 12-13-2010, 07:11 AM

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.

ptollefsen · #3 (**permalink**) 12-13-2010, 07:13 AM

Can you give me an idea where that valve is under the hood?

purplehorn1977 · #4 (**permalink**) 12-13-2010, 07:23 AM

check your PM

Zaairman · #5 (**permalink**) 12-13-2010, 07:24 AM

Broken blend door perhaps. It happens all the time in the F-150s and Rangers.

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