When computer warned me freon (R12) was low, I decided to retrofit to
134 as with my other vehicles. I took car to shop to check for leaks
(none) and evacuated the R12. I returned home to install R134.
Problem is, compressor won’t engage to uptake the refrigerant/oil. It
accepted one can, but no more, and this is probably just filling the
volume of the voided lines. Checking with A/C gauges shows inadequate
pressure on both high and low sides. Belt, fuse, and compressor are
OK. I need to know if there is a circuit or switch, etc. Is this a
Cadillac feature to require dealer service? Is there a computer code
required? I notice there appear to be 2 accumulators. In short, what
is the trick to get the compressor to run so as to permit recharge,
pressure check, etc.
Any help or advice will be greatly appreciated.
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