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ironmike
ironmike, ASE Master Tech
Category: GM
Satisfied Customers: 3382
Experience:  30 years L1, GM certified
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Where do you add freon on 2004 5.

Customer Question

where do you add freon on 2004 5.3 sierra
Submitted: 6 years ago.
Category: GM
Expert:  ironmike replied 6 years ago.

greetings,

You will be guessing how much is in the system without a machine to measure. You can but cans of 134a freon with a hose that will attach to the low side(service port should be on the accumulator) if you want to take a chance. Sometimes there is a small leak and it will work for awhile. If the system is empty you will need more than one can and the a/c system needs to be evacuated to function properly. Moisture is the enemy of freon and the systems function.

the high pressure side and the low side have 2 different sizes so you cannot make a mistake. low side is on the thicker line and close to the evaporator.

graphic

good luck