1993 Other Oldsmobile Models air failing

1993 OLDSMOBILE
161,000 MILES • 6 CYL • FWD • AUTOMATIC
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MICHAEL WITTIG
  • MEMBER
  • 2 POSTS
my 1993 0lds 98 air is failing.
it was seviced once at carx.
they said my in valve for thr freon intake was bad,
relaced with new.
i was good to go.
then it started failing again.
i ran the OBD and got a code 66, pressure something or another.
any thoughts?
Aug 16, 2008 at 6:47 PM
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MERLIN2021
  • CERTIFIED EXPERT
  • 17,250 POSTS
There are two sensors, one on the high and one on the low side. You need to hook up a set of guages to the system, unplug the low pressure cycling switch, located usually on or near the silver cannister(accumulator) and jump the leads, this should allow the compressor to run. If the readings are 25-35 low and 175-225 on the high side, your system should start to cool. Replace that low side switch.
Aug 17, 2008 at 7:19 AM