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Old 01-06-2009, 05:37 PM
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heater switch??

not sure what the problem is, went to switch heat to blow on floor and will only defrost on any setting.......any ideas
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Old 01-06-2009, 05:54 PM
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as i have heard on here, it sounds like a bad vacuum pump
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Old 01-06-2009, 06:54 PM
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you need to check for vacuum coming in to the cab.
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Old 01-06-2009, 07:11 PM
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where is the best place to check for vacuum, and if there is none its the pump?

thx for the quick replies =)
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Old 01-06-2009, 07:50 PM
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just wanted to add.....the heater switch is all i have a problem with, my brakes work fine??
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Old 01-07-2009, 05:58 AM
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THE VACUUM PUMP DOESNT CONTROL THE BRAKES, BUT A TECH CAN HELP YA TROUBLESHOOT
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Old 01-07-2009, 06:38 AM
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see if you have any vac line off under the hood by the fire wall the main one is behind the brake booster no it not the vac pump
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Old 01-07-2009, 07:11 AM
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will check, thank you
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Old 01-07-2009, 12:33 PM
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ok i am going to guess that this is where this is going to turn into a pain in the a** =)
first...i have a major vacuum line that runs across the firewall to the pass side of the truck from the 4 post vacuum bank on driver side inner fender. that line to the pass. side splits into 3 or 4 little lines, 3 (i think 3) stay connected to the outside of the heater box under the hood and one goes into the wiring harness and goes into cab. i pulled off one of the small lines under the hood by the heater box and it has vacuum, i dont know how much, i dont have a gauge, but it was enuff with the very small tube to keep it stuck to my finger, so if i have vacuum.....??? I am pretty sure this is where the pain in the butt starts lol
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Old 01-07-2009, 04:13 PM
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do you have vac at that one accuator by the right fender im not sure if that controls the defrost. did you check the switch inside that bezel around that panel just pulls of with a little effort take a screw driver and gentle remove it
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