Compresser sound near pass. side battery - Ford Powerstroke Diesel Forum

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post #1 of 12 Old 05-02-2012, 05:42 PM Thread Starter
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Compresser sound near pass. side battery

Might be a stupid question and I tried searching, but what is that little compresser near the passenger side battery. Not sure what it is, but it sounds like a compresser.
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post #2 of 12 Old 05-02-2012, 05:45 PM
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its a very small vacuum pump to run your HVAC mode selector door, and if your truck is a 4wd with the electric switch, it locks your hubs.
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post #3 of 12 Old 05-02-2012, 06:01 PM Thread Starter
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I have the turn knob for the 4x4, but I have to lock the hubs manually. whats hvac?
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post #4 of 12 Old 05-02-2012, 06:32 PM
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Heating, ventilation, ac.
Changes your blend door from floor, vent, and defrost.
Your hubs won't auto engage cause you have a vacuum leak/loss of vacuum to the front hubs. I bet when you auto engage them, the air goes to defrost only.



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4R100, 2wd
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post #5 of 12 Old 05-02-2012, 06:37 PM Thread Starter
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I have to turn the hubs by hand. theres arrows on there that say unlock and lock. inside the truck theres a knob for 2x4. 4x4 and 4x4 low
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post #6 of 12 Old 05-02-2012, 08:51 PM
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You have manual hubs. Auto hubs say auto and locked. Consider yourself lucky, one less source of a vacuum leak.

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post #7 of 12 Old 03-05-2013, 04:59 PM Thread Starter
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old post but, should i replace the pump first. it runs non stop. the hvac controls don't work either.

2003 F250 7.3 CC SB FX4
6 Pos. TS Chip Tuned by Tony Wildman
4" MBRP Turbo Back Straight Pipe
K&N Intake
Transgo Shift Kit
ATS Ported Turbo Housing
Wicked Wheel
3 Gauge Pillar Pod
Viper Remote Start w/ Turbo Timer
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post #8 of 12 Old 03-05-2013, 05:00 PM
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If it runs non stop you have a vacuum leak.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #9 of 12 Old 03-05-2013, 05:58 PM
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Does the pump have a fuse? If the pump isn't working at all is it fried??

2000 F350 CCLB 536 k+ miles still runs like a top!
Diablo chip, quickie pedal, valve body, Air Force One air intake, MBRP system, XD Diesels w/ MT ATZ's, KL5H Train Horns / Air Zenith supplied.
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post #10 of 12 Old 03-05-2013, 06:26 PM Thread Starter
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Were should I look for the leak? The hvac controls? The pump is always on. Never turns off. I was just going to buy a new one.

2003 F250 7.3 CC SB FX4
6 Pos. TS Chip Tuned by Tony Wildman
4" MBRP Turbo Back Straight Pipe
K&N Intake
Transgo Shift Kit
ATS Ported Turbo Housing
Wicked Wheel
3 Gauge Pillar Pod
Viper Remote Start w/ Turbo Timer
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