Question about 1998 Ford Mustang

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No power to AC compressor

Ihave a 1998 mustang that is getting no power to compressor. have changed cycle switch, no help. blows cold if i wire direct to battery

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Well what you can do because your switch is bad is have a mechanic install a toggle switch that has to be flipped on before you turn on your ac and your compressor will go back to working normally. wired directly to battery is the only way to guarantee that you will get back to that ice cold as. ENJOY!!!!!!

Posted on Jul 26, 2009

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1 Answer

97 cad deville low pressure cycling switch location


probably overcharged the system and now the high pressure switch is stopping the ac from working
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I have a 95 isuzu holden rodeo. My a/c compressor is not getting power to it? I have changed the fuses and relays.Compressor works and blows cold air if i hard wire it? What could be my problem?


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one is a low pressure switch that will stop the compressor if there is a gas leak
the next is a high pressure switch that will stop the compressor if the condenser fan stops or there is a blockage in the line after the compressor which results in too higher a pressure that will destroy the compressor
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I have a 2001 Ford Mustang V6, the ac is blowing warm air. We checked the refrigerant and it is full. The ac compressor will kick on for a few seconds and then kick off. Why is the compressor not staying...


it's either low (in spite of your readings) or your a/c clutch is not working correctly or you have too big an air gap in the clutch.
First, just disconnect the 2 pin connector from the a/c pressure cycling swithc and jumper the 2 pins with a wire to force the clutch to stay engaged. See if it blows cold then, and stays engaged. You can run this way for about 15 minutes before you have to pull the plug.
report reulsts.

please don't forget to rate.

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1 Answer

1998 Ford Mustang - No power to AC compressor


Check fuse and also low pressure switch located in engine bay at the ac hose close to the wall passenger side. If low gas safety will not allow compressor to come on!.

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1 Answer

Air conditioner blows cold then not at all but i can still hear the blower and ice is accumulating under the dash


your ac is freezing up, you will need to replace the ac compressor cycling switch in the low side line or at the receiver dryer/accumulator.

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1 Answer

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If you are jumpering the a/c cycling switch to kick the compressor on, you are likely low on freon. Get a a/c kit with a gauge on it to add a can of freon. Add about half a can and see if it starts cycling on and off. And, make sure the gauge reads in the "good" range. Then add some more. Make sure it does no go outside safe range.
When full, it should cycle on and off 4 to 7 times/minute at 70 degrees F.
You may have a slight leak.

report progress.

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3 Answers

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have u tested the ac compressor cycling switch located in the low side line from the compressor? also a common failure is the AC compressor cycling relay also known as the WOT (wide open throttle) relay Jumper a wire across the AC cycling switch in the low side line, if the compressor runs replace the switch, if not then replace the relay which in in the power distribution box under the hood.

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