A/C goes into "run away mode" instead of cycling .. suggestions...

This is a two part Bryant Air Conditioner...24,000 btu. model number 513.. with a through the wall compressor and coil. The second section is ceiling mounted air floor distribution. Installed in 1994...R22 system. Has had regular preventative maintenance.
The system turns on (several existing problems have been repaired, I think we're looking at the original problem) ....compressor starts normallly and runs for a few minutes. When it's time to cycle, compressor keeps running, getting louder and louder (at which point I shut it off). After waiting a period of time, the system can be started again and the process repeats itself. Starts normal and then runs on.
It does cool properly....and the fans are operable both in auto and cont mode. This is a cooling only unit.... (not a heat pump)
Coils have been cleaned. A diagnosis was made about the flare connection to the metering valve leaking like a "sieve", but I think this problem might have been introduced into the system during diagnosis, as the freon level was measured to be acceptable.
Any leads as to where the problem might be ???
Thanks in advance !!!
Peter
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Peter wrote:

What do you mean by 'time to cycle'? Is the thermostat's call for cooling satisfied?
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The compressor should have absolutely NO power applied when it is 'time to cycle'. Usually the 220 v power is removed by a contactor(relay). The contactor is controlled by a 24 volt thermostat line.
I suspect your diagnosis is wrong and it never reaches thermostat shutoff. I suspect either a gross overcharge or burnt winding in your compressor or both.
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