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No power to compressor or Low pressure switch


scbuddney

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Jul 13, 2015
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Vehicle Year
1991
Make / Model
ford
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Automatic
I've determined that the compressor is not getting any power. I've checked the fuses (that I've been able to find) and they look good. I've checked power at the clutch and low pressure switch - nothing.
I jumped the straight from the battery and low pressure switch the compressor kicked in.. I noticed when the air worked last the button I push on the dash for air, the button lit up. it does not now. Please help-its hot out
 
Last edited:


ick

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Mesa AZ
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1999
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Ford
Engine Size
3.0
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Automatic
scbuddney said:
I've determined that the compressor is not getting any power. I've checked the fuses (that I've been able to find) and they look good. I've checked power at the clutch and low pressure switch - nothing.
I jumped the straight from the battery and low pressure switch the compressor kicked in.. I noticed when the air worked last the button I push on the dash for air, the button lit up. it does not now. Please help-its hot out
Click to expand...
You shouldn't jump from battery to low pressure switch. If you don't have an ac gauge or an understanding of the ac system you really should take it to a shop so you don't cook your pcm or a switch. That said, if you haven't fried anything yet, you could get a paperclip and jump the low pressure switch (remove the connector from the low presure switch and connect the two ends of the paperclip into the low pressure switch wire harness, vehicle should be running). If the clutch engages, remove the clip immediately. Running a compressor with low refrigerant will damage the compressor. If the compressor works, looks for signs of a leak, fix leak and evac/recharge. If not report back here.

Sent from my SAMSUNG-SM-G920A using Tapatalk
 

2trux

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Oct 22, 2014
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Albuquerque NM
Vehicle Year
1989
Make / Model
Ranger
Engine Size
2.9 L
Transmission
Manual
This may be a little late but I had no power to the clutch on my ranger. It turned out to be the full throttle cutout relay. I took the connector off the relay and jumped the connector to get the power past this point and clutch started activating as it should. The only thing this affects is not disabling the clutch at full throttle. The relay on my truck was located under the fuse box that is near the battery. My truck is a 89.
My problem was not a relay issue, it was being activated all the time as if I was at full throttle. I will chase down this problem in the winter when I don't need the A/C.
 
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