Quote:
Originally Posted by Hugh R
If you still have gas in the system and its R-134, you can slowly add to the low pressure side of the system with a can of r-134 that came with a charging hose. I'd put a digital temp gauge in the dash vent and slowly add until the temp quits dropping. DO NOT invert the can when adding, a liquid slug and hydrolock (break) the compressor. Wear safety glasses!
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This is great advice!
We did have the dual gauges but always stuck a thermometer on the output side.