Was charging the a/c and the pump engaged but just warm air came out

Question

Put a vacuum to the a/c then charged it. It took 1.5 of the 2.5lbs it calls for and so I fired it up and turned on the a/c.

The pump engaged but the air was still warm and the pump got real hot, too hot to touch almost. The low side was at 350 and I couldn’t tell what the high side was because the adapter wasn’t right.

What would cause this?

HandyHowie · Answer

The only way you could possibly have 350psi on the low pressure side is if you have fitted the pipes to the incorrect ports on the compressor.  This is definitely possible on some compressors.

You must have the low pressure pipe connected to the high pressure port on the compressor.

Can you add a details of the type of compressor fitted?  A photo would also help.

Was charging the a/c and the pump engaged but just warm air came out

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