A/C is always on? - Ford Powerstroke Diesel Forum
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post #1 of 24 Old 04-26-2010, 07:52 AM Thread Starter
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A/C is always on?

No matter what position I have the selector switch in, my air conditioner is always on. It works great, nice and cold. But I don't want to wear out my compressor prematurely. Also, the blower motor only works on high, so i get frozen, or hot, no in-between. I believe the blower motor problem is a relay that needs to be replaced. I just haven't gotten to the dealer in a while. However, i don't know what's keeping the A/C on all the time. I can figure most things out on my own and am pretty handy. But I've been searching for this issue quite a bit and came up with nothing helpfull. Most issues I found are related to A/C not working, etc. Any help would be appreciated. I'm not sure if it's hurting my mileage or not since I just went to larger tires and the nu8mbers are all off, but if it is, It would be nice to put that money back in my pocket too since I drive 600 miles a week.

Oh, I always have the vent switch on the position just to the right from 'Off', going to dash/floor(not defrost). A/C should only be on at the AC, Max AC, Def, and Def/floor settings. Dash/floor, and floor should be vent only.

thanks!

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post #2 of 24 Old 04-27-2010, 05:56 AM Thread Starter
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Bump Bump

2003 F250 FX4 7.3L CC/SB Lariat
S&B Intake, DP Tuner F5 60T/60E/80E
Wicked Wheel, Autometer Gauges
Muffler Delete, AIH Delete, foil delete
BrightBox + FogLights mod
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post #3 of 24 Old 04-27-2010, 05:58 AM
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sounds like a good question for a dealer or a trusted mech. agree sounds like a relay issue to me.

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post #4 of 24 Old 04-27-2010, 07:07 AM
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I think I may have this same issue so I am curious as well.


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post #5 of 24 Old 04-27-2010, 01:19 PM
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The AC runs all the time in the 7.3's not sure what is wrong with your fan switch, but the AC will always be on.

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post #6 of 24 Old 04-29-2010, 08:57 AM Thread Starter
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NCH, I know you pretty much always know what you're talking about, but I still find that hard to believe. Why would they engineer it like that?

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post #7 of 24 Old 04-29-2010, 09:01 AM
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We've had several threads about it and every 7.3 I know of does it

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post #8 of 24 Old 04-29-2010, 09:31 AM Thread Starter
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I wish I could find those threads. All I found was 'A/C doesn't work' type issues

2003 F250 FX4 7.3L CC/SB Lariat
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Wicked Wheel, Autometer Gauges
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post #9 of 24 Old 04-29-2010, 09:47 AM
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I read, I believe in the owner's manual, that the AC compressor will run in all settings except off, dash vent, and floor vent. All of the others trigger the AC compressor to cycle. I don't like it so I run in "dash vent" mode only. I have verified this functionality on my 2000.

Turning the selector switch to off will kill the blower fan too.

I think it's a perfectly normal system except for being vacuum actuated. That's silly.

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post #10 of 24 Old 04-29-2010, 09:53 AM Thread Starter
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I run mine on the dash/floor combo mostly. I'll try switching to dash only and see if it makes a difference. I think i tried that already, but I remembe right now. I have an hour drive to work one way, so that should be enough time to experiment with all the settings this evening when I get off at 6

2003 F250 FX4 7.3L CC/SB Lariat
S&B Intake, DP Tuner F5 60T/60E/80E
Wicked Wheel, Autometer Gauges
Muffler Delete, AIH Delete, foil delete
BrightBox + FogLights mod
HPO X-Over

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