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| Here is a high-tech troubleshooting procedure.
Take your bare hand and grab the low-pressure return line. If you grab the high-side by accident, it will most likely burn your hand so make sure you grab the low-pressure side. It will be the line coming from the cab. If the low-pressure side it decently cold, then focus your efforts on troubleshooting the air handling section. If it is not very cool, then concentrate on the refrigeration side of the system.
Mav
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