I had my upstairs unit to quit cooling two weeks ago and I hooked my gauges up to it while it was running. Had 150 on the high side and 45-50 on the low side. The return refrigerant line was cool to the touch but not as cold as I thought it should be. Got my BIL to come out and check it (been running his own heat/ac business 29 years). First thing he hooked up was a Fluke digital thermometer to the low side line that also had a separate outside air temp probe and then hooked a gauge to the low side. As he explained it, the low side line needed to be within a degree or so of the air temp going back to return vent. Took less than a pound to get it back up to snuff. The next week, my downstairs unit killed the start capacitor for the compressor! Helps to have connections! Sounds like you've got a low charge issue.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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