there is a connection on canister its the only connection the refill hose will fit
134 A
A 1997 GMC Jimmy uses R-134a as its refrigerant. This refrigerant replaced the older R-12 (Freon) due to environmental regulations. If you're servicing the air conditioning system, ensure to use R-134a to maintain its efficiency and comply with legal standards.
in the low pressure side
If you are having to add refrigerant, then this means you have a leak, and you will be adding refrigerant again in a few months. It is illegal to add refrigerant to a system with a leak without first repairing the leak. So, my advice is to take it to a professional and have the leak repaired and refrigerant added with the proper equipment, which you do not have.
To the transmission. Down the dipstick tube.
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