Compressor Clutch or Sending Voltage?
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Compressor Clutch or Sending Voltage?
Symptoms: Air flows through cabin vents, but it is not cool.
Bronco: 1990 351W w/ R-134a conversion
I just measured 7.4 volts going to the A/C Compressor clutch when the A/C is supposedly on, however the clutch will not engage (never clicks or spins). The reading is 0 volts when only the vents are running (not on A/C).
Is this a faulty clutch, or should I be seeing a higher voltage? I did read somewhere that if the refrigerant system is bad that the clutch will never be activated, but I have not been able to confirm the nominal voltage that is supposed to be sent to the clutch.
Thanks!
Bronco: 1990 351W w/ R-134a conversion
I just measured 7.4 volts going to the A/C Compressor clutch when the A/C is supposedly on, however the clutch will not engage (never clicks or spins). The reading is 0 volts when only the vents are running (not on A/C).
Is this a faulty clutch, or should I be seeing a higher voltage? I did read somewhere that if the refrigerant system is bad that the clutch will never be activated, but I have not been able to confirm the nominal voltage that is supposed to be sent to the clutch.
Thanks!
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Wiring is good. I bypassed the low pressure sensor and got the clutch to spin, and the system to take a charge.
It seemed to hold the charge while the motor was running, but when I shut off the motor I heard a loud "hissing" sound. After plugging the low pressure sensor back in, the clutch would not engage.
So...it seems as though I have a leak. Also seems that the low pressure sensor is an analog signal (not I/O)?
Next question: My mom will be using the Bronco for a long haul (800 miles), and I would like to keep her cool. If I were to jump the low pressure sensor to keep the clutch engaged (vent is still blowing colder air when clutch is engaged), would I potentially harm the compressor or other A/C equipment?
I'm not too worried about the long term as I'm a windows down kind of guy anyway.
It seemed to hold the charge while the motor was running, but when I shut off the motor I heard a loud "hissing" sound. After plugging the low pressure sensor back in, the clutch would not engage.
So...it seems as though I have a leak. Also seems that the low pressure sensor is an analog signal (not I/O)?
Next question: My mom will be using the Bronco for a long haul (800 miles), and I would like to keep her cool. If I were to jump the low pressure sensor to keep the clutch engaged (vent is still blowing colder air when clutch is engaged), would I potentially harm the compressor or other A/C equipment?
I'm not too worried about the long term as I'm a windows down kind of guy anyway.
Fleet Mechanic
Joined: Feb 2006
Posts: 1,776
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From: Lorain County, Ohio
...
If I were to jump the low pressure sensor to keep the clutch engaged (vent is still blowing colder air when clutch is engaged), would I potentially harm the compressor or other A/C equipment?
I'm not too worried about the long term as I'm a windows down kind of guy anyway.
If I were to jump the low pressure sensor to keep the clutch engaged (vent is still blowing colder air when clutch is engaged), would I potentially harm the compressor or other A/C equipment?
I'm not too worried about the long term as I'm a windows down kind of guy anyway.
A leak that you can hear like that shouldn't be very hard to spot
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