Subject: 20V/I5 AC Saga

[Christopher Ritchie]

As some may remember, my compressor was in 2seconds on 10seconds
off mode.

I evacuated the system today and filled it with R134 to
capacity. No change.

I bypassed the AC relay and it still does the same 2/10 cycle.

What's next? Is it the head unit somehow?
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There's a high pressure cut-out sensor/switch.  There's a low pressure
cut-out sensor/switch.  There's also some other sensor(s) that turn power to
the compressor clutch off.  One of them is on or near the evaporator to
prevent something from freezing up.

Jumper the low pressure switch.  Measure your high side pressure when the
compressor cuts in.  Check the Bentley.  See if you can bypass or jumper
these sensor/switches one by one to see which one it is.  Finally, I guess
it could be a flukey head.  Have you pulled the codes?


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