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Ford F-Series Climate Control

54 messages,  Last post on Oct 31, 2009 at 11:21 PM

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What is this discussion about? Ford F-150, Ford F-350, Ford F-250, Heating / Cooling, Truck

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#5 of 54 Re: '99 F-150 climate controls prolem [jetmech_63] by fordtuf1 Mar 18, 2007 (8:07 pm)
Replying to: jetmech_63 (Oct 10, 2006 10:48 pm) I don't know if this applies but ... on my F250 the vacuum for the heater/ac vents is shared. Of all things it is shared with the auto locking 4x4 hubs.   I found this out when I was looking for information about serviceing both differentials and the transfer case.
#6 of 54 heat/ac selector switch by trevorwithf350 Apr 20, 2007 (7:00 pm)
Have the same problem as message above. Every few days I burn a breaker that controls the floor/vent/defrost selector control. It seems to be related to my backup lights also. Think it is fuse #28 under dash on 2001 f-350. Replies to this message: 0patience (Apr 20, 2007 8:46 pm) trevorwithf350 (Apr 21, 2007 9:12 am) 0patience (Apr 21, 2007 9:46 am) and 1 more...
#7 of 54 Re: heat/ac selector switch [trevorwithf350] by 0patience Apr 20, 2007 (8:46 pm)
Replying to: trevorwithf350 (Apr 20, 2007 7:00 pm) Fuse # 28 is for the Brake shift interlock, DRL Relay, Speed control Module, Vacuum pump motor, hublock solenoid, back up lights or digital transmission range sensor, heated seats, parking aid module and trailer electronic brake feed.   So, what pops the fuse? What doesn't work?   The blower motor relay is on fuse 22 circuit. The realy controls both the motor and the floor/panel/defrost mode.   One thing to try is to disconnect the heater blower motor resistor. The plug in is close to the blower motor. It will run the heater motor only on high, but if the relay lasts, then the resistor is grounding. Replies to this message: trevorwithf350 (Apr 21, 2007 9:12 am) 0patience (Apr 21, 2007 9:46 am) trevorwithf350 (Apr 21, 2007 1:12 pm)
#8 of 54 Re: heat/ac selector switch [0patience] by trevorwithf350 Apr 21, 2007 (9:12 am)
Replying to: 0patience (Apr 20, 2007 8:46 pm) Thanks for responding. The fuse is #28 that blows. the floor/vent/defrost selector switch and the backup lights seem to be the only thing it affects. There is no rhyme or reason to when. It will be okay for a few days and then blow. So if I try the experiment above do you think this will help isolate? Is the relay and that #22 circuit connected to the backup lights also? Replies to this message: 0patience (Apr 21, 2007 9:46 am) trevorwithf350 (Apr 21, 2007 1:12 pm)
#9 of 54 Re: heat/ac selector switch [trevorwithf350] by 0patience Apr 21, 2007 (9:46 am)
Replying to: trevorwithf350 (Apr 21, 2007 9:12 am) That is the strange thing. Fuse #22 doesn't affect the back up lights. Fuse #28 does, but doesn't go to the fan circuit.   I think you may have more than just a fuse problem.   Unplugging the resistor will help to determine if it is a resistor problem, which is often a cause of the relay going. So it is an easy test to eliminate it as the problem. Replies to this message: trevorwithf350 (Apr 21, 2007 1:12 pm)
#10 of 54 Re: heat/ac selector switch [0patience] by trevorwithf350 Apr 21, 2007 (1:12 pm)
Replying to: 0patience (Apr 21, 2007 9:46 am) Thanks again. So if this resistor/relay is bad would it trip the #28 fuse? #22 is not blowing. You stated that #22 doesn't go to the fan circuit. I'm not sure if I made it clear that the fan speed selector is okay, but its only the floor/vent/defrost knob that defaults to defrost.
#11 of 54 backup lights blow #28 fuse by trevorwithf350 Apr 21, 2007 (2:24 pm)
I posted an earlier message involvig my backup lights and heat switch blowing the fuse. I have worked on my truck and discovered that these were only coincidences. #28 is still blowing ocassionally though. Can't figure out why. How could I track a ground in a wire? Where would I start?
#12 of 54 ac reverts to defrost by montana2001 May 21, 2007 (9:38 pm)
2005 F250 SD, V10 Triton. Best truck I have ever had. I have only one issue that I have taken in to the shop for and it has re-occured. When the ac is on and I put it to "max AC" it will revert to the defrost vents. And it does not blow as hard. Is it more likely to be a vaccum issue or the diverter that is not moving properly. Thanks for any advice.
#13 of 54 F150 Interior heat by 031351 Feb 17, 2007 (7:19 am)
#14 of 54 F150 Interior heat by 031351 Feb 04, 2007 (9:09 am)
Just purchased a new F150 super cab 4x4, this is the 4th I have owned. I very dissatisfied with the heating system, no matter what control you set it at very little to no heat will come out on the floor. Dealer removed dash replaced components and still the problem exists. They indicated all trucks on their lot acted the same way. Guess I am stuck with cold feet. Replies to this message: rflyman (Feb 17, 2007 7:19 am)

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