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How can i tell if i'm low on freon?

Chevytahoedude on Sat July 28, 2012 11:21 PM User is offline

Year: 1999
Make: Chevy
Model: Tahoe
Engine Size: 350
Refrigerant Type: 134
Ambient Temp: 95
Pressure Low: 55
Pressure High: 225
Country of Origin: United States

Hey guys, my a/c compressor is disengaging too often and when i took off the plastic caps to attach the gauges, the high pressure port started to shoot off alot of air or freon. Should this happen when just removing the cap or is the port bad? It was also covered in black oil.

I added 24oz of 134 and the gauges read 50 and 215psi. The air blew cold for a while but then blew hot for about 5 minutes. How can i tell if im low on freon?


brickmason on Sun July 29, 2012 12:34 AM User is offline

Feel the inlet and outlet at the evaporator if its an accumulator type system with engine running and A/C on ( where the tubing goes in from a tall usually black or silver canister at the firewall near the blower motor). Both should be cold and about the same temperature.

The suction line from there all the way to the compressor should be cool too if it has a full charge.
The other line ( discharge) will be hot.

Just another brick in the wall

Had a little mule I fed him castor oil and every time he jumped the fence he fertilized the soil

Cussboy on Sun July 29, 2012 8:00 PM User is offline

Originally posted by: Chevytahoedude
How can i tell if im low on freon?

Easy question. You're NOT low on freon. Your 1999 NEVER had any freon, was R134a from the factory.

Most likely you want to know if the R134a level is correct. The best way is to have it evacuated and measured, the only real way.

mk378 on Mon July 30, 2012 11:52 AM User is offline

If it gets cold once, you have enough-- unless it is leaking out as fast as you put it in. Does the compressor still engage when it is blowing hot?

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