GMC suburban where's the low side to add 134R ?

[Mark Gross]

Question;

I need to add refrigerant I believe with 134R . My vehicle is a 1999 GMC Suburban SLT. the sticker they said was under the hood is no where to be found. So which fitting is the low side. there seems to be 3 different fittings close together ??



anyone know ?????:unsure:



Mark

 

[byron cooley]

Low side fitting is allways on the line that feeds to the dash. The high side will be on the line that feeds towards the radiator. They are 2 distinct different sizes. The fittings will not fit each other.

 

[Mark Gross]

Thanks ,

Byron I appreciate it.



Mark

 

[byron cooley]

Total capacity is 1.81kg or 4lbs.

 

[Mark Gross]

Someone told me that there is a second tank or fitting for the rear controls ? Is this true ?



Thanks in advance guys.



Mark

 

[Bruce Freeman]

If you only have one compressor you will only have one set of fittings, but the quanity will be more. It will be on a tag on the core support or fan shroud. If topping off with the small cans you can not over fill the system (not enough pressure in the can) charge with a/c on...



BF