Do you have an update on what the issue was? My first guess would be a stuck thermostatic expansion valve (TXV). I'm having the same issue but with a SGM brand system. I purchased a new receiver/dryer, TXV, and was going to flush out the entire system before vacuuming and recharging.
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1997 Blue Bird BMC-37, Cummins C Series 8.3 325HP, Allison HD3060. No tag, no slides.
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