no power to A/C compressor

npresley · 04-27-2011, 08:15 AM

I have a 98 B2500 2wd, reg cab, and reg bed. After 2 yrs & baby on the way, I've decided to get the A/C going again. The lines are a couple of years old, and I replaced the 2 inline pressure switches. The fuse has power across it and the switches are getting power. The relay is good, but I am only seeing .03 volts at the compressor. What am I missing? Thanks for the help.

-Nathan

**Earl43P** · 04-27-2011, 01:02 PM

Probably low on refrigerant.

Disconnect the low pressure switch and jumper its (harness) connector pins together (paper clip works). If compressor engages, you are low on refrigerant.

npresley · 04-27-2011, 05:31 PM

I did that last night and the voltage was still .03V to the compressor. I jumped both switches individually and together. I do need to refill the system, but I can't get power to the compressor.

npresley · 04-28-2011, 07:43 PM

Is there another switch or relay I am missing?

**adsm08** · 04-28-2011, 07:57 PM

May be a bad wire to the compressor.

04-27-2011, 08:15 AM	#1
npresley New Member Join Date: Aug 2007 Year: 1998 Make: Mazda Model: B2500 Posts: 19 Rep Power: 0 iTrader: (0)	no power to A/C compressor I have a 98 B2500 2wd, reg cab, and reg bed. After 2 yrs & baby on the way, I've decided to get the A/C going again. The lines are a couple of years old, and I replaced the 2 inline pressure switches. The fuse has power across it and the switches are getting power. The relay is good, but I am only seeing .03 volts at the compressor. What am I missing? Thanks for the help. -Nathan __________________ 98 Mazda B2500, 5spd
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04-27-2011, 01:02 PM	#2
Earl43P Premium Member Join Date: Aug 2007 Location: E-City, NC Year: 2000 Make: Ford Model: Ranger Engine: 3.0 Class: 4WD Used For: DD Posts: 2,769 Rep Power: 21 iTrader: (1)	Probably low on refrigerant. Disconnect the low pressure switch and jumper its (harness) connector pins together (paper clip works). If compressor engages, you are low on refrigerant. __________________ If at first, you don't succeed, RTFM.
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04-27-2011, 05:31 PM	#3
npresley New Member Join Date: Aug 2007 Year: 1998 Make: Mazda Model: B2500 Posts: 19 Rep Power: 0 iTrader: (0)	I did that last night and the voltage was still .03V to the compressor. I jumped both switches individually and together. I do need to refill the system, but I can't get power to the compressor. __________________ 98 Mazda B2500, 5spd
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04-28-2011, 07:43 PM	#4
npresley New Member Join Date: Aug 2007 Year: 1998 Make: Mazda Model: B2500 Posts: 19 Rep Power: 0 iTrader: (0)	Is there another switch or relay I am missing? __________________ 98 Mazda B2500, 5spd
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