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heater not working

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Nov 4, 2006 | 01:13 PM

#1

adrenaline8158

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Joined: Nov 2006

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heater not working

i have a 99 superduty with a 7.3 but the heater is stuck on defrost and wont switch to floor or vent could it be the switch or maybe something with vacuum any suggestions

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Old

Nov 4, 2006 | 01:57 PM

#2

whomrig

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Joined: Mar 2001

Posts: 898

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From: SF Bay area

Hi, d you her a vacuum leak under the dash? i no vacuum, te directing door will not operate properly if at all. Do you get heated air? Or, the dooriself is possibly stuck.

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Nov 4, 2006 | 07:31 PM

#3

adrenaline8158

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i did find a vacuum line under the glove box that was apart but fixed that and still didnt make a difference i have good heat but it just wont switch to anything else

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Nov 5, 2006 | 11:00 AM

#4

mein2xshp

Junior User

Joined: Jun 2005

Posts: 70

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From: Dingmans Ferry PA

Had same problem last year, it was my blend door, it was stuck over for a/c.

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