Question about 1999 Jeep Grand Cherokee
Jeep Cherokee 4.0 year 1999 A/C compressor clutch cuts in and shuts off about every 30 seconds even with the A/C switch in off position. When A/C ist turned ON everthing works fine.
Hello akaobaer...Sounds like you have a pressure switch defective or the system charge (freon) is low...The a/c clutch relay is operated by the Powertrain Control Module. However there are inputs from the low pressure switch (located on the accumulator) and a high pressure cut out switch (located on the discharge line near the compressor) that control whether or not the PCM turns on the clutch relay as well.
If the refrigerant level is low, the PCM low PSI switch will cause the clutch to cycle.
The PCM turns on the relay by grounding the negative side of the relay coil...The low PSI switch should turn on (close) at approx 34 PSI.....and will turn off (open) at 20-22 PSI...May sound complicated but it's really not. Have a qualified HVAC tech. check the system for leaks before recharging it, if needed.
Good luck...i hope this answers your question and will fixya up...
Posted on May 19, 2009
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Posted on Jan 02, 2017
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