Ac compressor not Getting power - Mustang Evolution

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Old 08-02-2015, 07:00 PM   #1
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Ac compressor not Getting power

The other day I hopped in my car leaving work and turned the ac on it wasn't blowing cool air

Things I've tried :

Testing all fuses with test light
Tested and jumped at low pressure switch
Tested high pressure switch
Tested pressure at low pressure
Turning the clutch to see if it was hung

I was looking for the relay and couldn't find one? Any ideas ?
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Old 08-02-2015, 07:31 PM   #2
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Just asking the obvious did you check if it has freon

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Old 08-02-2015, 07:36 PM   #3
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I tested the low pressure and it was around 80 psi I believe
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Old 08-02-2015, 07:41 PM   #4
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I believe that's to high to much or not enough freon will cause the ac to be cool

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Old 08-02-2015, 07:49 PM   #5
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Compressor never kicks in as well I tried emptying the freon and refilling it and had no luck

I tested the switch that plugs into the compressor and it's not getting any power
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Old 08-02-2015, 07:49 PM   #6
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May be the low pressure switch

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Old 08-02-2015, 07:54 PM   #7
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I've tested the low pressure switch it's getting power even tried jumping it and had no luck
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Old 08-02-2015, 08:13 PM   #8
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Then I'm not may be your compressor

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Old 08-03-2015, 05:56 AM   #9
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you said you got 80 psi, what gauge did you use? if its the type thats on top of a can of freon from walmart/autoparts store, then get your hands on one more to make sure the scale wasnt off. ive seen that happen plenty of times (reading way too high or way too low).
the 80 psi he saw was likeley with the compressor off 100 is usually where you wanna be when it is off. you can borrow a reliable set of gauges at Autozone specifically, usually they wont make you pay the loaner cost if you are just using them in the parking lot. depends on the store.
but generally, with the a/c cans with the gauges on top, you should be just in the red zone when the vehicle is off. when it starts running the compressor, it will drop down the green area. Be careful not to add too much freon though. 80 sounds like enough to start the compressor, but i would expect it to cycle on and off.
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Old 08-03-2015, 11:58 AM   #10
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check relay,if you have power to low-pressure switch and no futher most likely relay bad. switch with one for cooling fan..does the rad fan come on when switching on a/c? check pcm for code could be circuit that delays a/c when starting,seen it before on ford, its controlled by pcm
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Old 08-09-2015, 07:12 AM   #11
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You need real ac gages to get a real reading what comes with the can of freon don't cut it

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Old 08-09-2015, 07:15 AM   #12
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True^ more or less good for a relativity reading. Otherwise I've seen plenty of those gauges be way off mark.

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Old 08-09-2015, 07:17 AM   #13
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Yes filled the wife's ac and it wouldn't blow cold had a friend put his gages on and it was way of

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Old 08-09-2015, 12:18 PM   #14
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If your pressure matches the pressure/temp chart here then you have the correct refrigerant charge. 80 psig would be inline if your ambient temp was about 76 (doubtful in the summer considering under hood heat from the sun or engine heat if you had been running it before seeing the 80)
Pressure - Temperature Chart for HFC-134a
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Old 08-12-2015, 11:36 PM   #15
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True^ more or less good for a relativity reading. Otherwise I've seen plenty of those gauges be way off mark.
i used 2 sets of gauges both really good sets, ac pressure lines up right with the chart :/ any other ideas?

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Old 08-13-2015, 06:35 AM   #16
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I didn't see if this was answered, but does the ac clutch engage? If you have a loose vacuum line, maybe you are running your a/c but the cold air isn't being routed inside the car?

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Old 08-13-2015, 01:22 PM   #17
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No clutch does not engage :/ I used 2 different sets of gauges as well presdure is fine
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Old 08-13-2015, 01:49 PM   #18
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Might be time to roll down the windows and let nature be the AC.
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Old 08-13-2015, 02:25 PM   #19
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That's what it seems like first the compressor locked up a month later clutch won't even kick on maybe it's a sign but I can't deal with this hot *** sun
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Old 08-13-2015, 03:40 PM   #20
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Quote:
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That's what it seems like first the compressor locked up a month later clutch won't even kick on maybe it's a sign 😂😂 but I can't deal with this hot *** sun 😂
Did you buy this compressor or its the one that came with the car if its new then just warranty it out from where you bought it.

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Old 08-13-2015, 03:42 PM   #21
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Do a pin out on pcm,think you will find problem there
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Old 08-13-2015, 03:57 PM   #22
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Did you buy this compressor or its the one that came with the car if its new then just warranty it out from where you bought it.

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The compressor is literally 2 months old i don't believe it's a compressor problem
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Old 08-13-2015, 03:58 PM   #23
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A few posts back you said it locked up that was the old one

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Old 08-13-2015, 04:11 PM   #24
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A few posts back you said it locked up that was the old one

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Yeah the oLd one locked up and broke the belt I replaced the compressor orfice tube dryer belt and flushed the system
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Old 08-13-2015, 04:36 PM   #25
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Well try what they said and pin the pcm

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