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GMT900 Low Pressure Port for a/c


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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.

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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.

 

 

37-23502.jpg

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