GMT900 Low Pressure Port for a/c

[cmh2001]

Does anyone know (a photo would be helpful) which is the low pressure port for the air conditioning system? I want to check the pressure level and possibly add some freon. I have done some extensive Internet searching for this but so far haven't come up with anything.

 

Mine is a 2010 with the 4.8 L engine.

[gmtech4]

do you have r143A ?

 

its under warrantyisnt it ?

 

its the smaller diameter fitting

[00Silverado4x4]

Once you get the set up to check your pressure, the hose will only connect onto one fitting which will be for the low side. Passenger side firewall in engine bay.

[txab]

Does anyone know (a photo would be helpful) which is the low pressure port for the air conditioning system? I want to check the pressure level and possibly add some freon. I have done some extensive Internet searching for this but so far haven't come up with anything.

 

Mine is a 2010 with the 4.8 L engine.

 

 

It's the black screw-off cap.