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Old February 6th, 2007, 06:19 AM   #1
MichiganLarry
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Default Heat issues 02 F350

My 2002 F-350 diesel has developed a new quirk. Since yesterday it wont switch from defrosters to heat. The air coming out of the defrosters is plenty warm but the floorboards are getting pretty cold on my 45 minute drive into work. Any ideas?
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Old February 6th, 2007, 06:22 AM   #2
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That happened on a ford work truck a couple weeks ago. It ended up being a directional motor. $75.00
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Old February 6th, 2007, 06:23 AM   #3
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Check for vaccum hose leaks. My 01 had a cracked hose that caused a similar problem.
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Old February 6th, 2007, 07:00 AM   #4
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It did this once before. Was f'd up for a couple days then worked fine for a month or so.
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Old February 6th, 2007, 07:08 AM   #5
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It did this once before. Was f'd up for a couple days then worked fine for a month or so.
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Old February 6th, 2007, 07:11 AM   #6
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The time that it was screwed up was it Really cold out? If there is vac lines controlling it I would guy you have a bad hose or connection.
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Old February 6th, 2007, 07:14 AM   #7
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It was cold. Not like now. Thats what I was guessing too. Is just so f'ing cold outside that I don't want to have to be out there for an hour figuring this out. :miff:
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Old February 7th, 2007, 11:43 AM   #8
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www.dieselstop.com I recall several posts about this. Go to the forum that is specific to super duties.
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Old February 7th, 2007, 02:43 PM   #9
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Thanks. Great site.
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Old February 7th, 2007, 06:27 PM   #10
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Quote:
Originally Posted by MichiganLarry View Post
My 2002 F-350 diesel has developed a new quirk. Since yesterday it wont switch from defrosters to heat. The air coming out of the defrosters is plenty warm but the floorboards are getting pretty cold on my 45 minute drive into work. Any ideas?
Check the electronic vacuum pump on the passenger side of the engine compartment next to the vacuum reservoir. They go bad all the time.
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