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When we have a car come into the shop with a/c concerns we suck down whatever is in there,(it tells us how much we pulled out), put a vacuum on it ,(we can then tell if it holds vacuum or not), then we fill it to spec with dye. Then we run it for a while and look at the system with a black light and we can visually see where it is leaking because there will be traces of dye where it is leaking. When you put a vacuum on the system you can watch the gauge and see if it loses vacuum which means there is a leak. I would not go to a small indepent shop where they just put cans of refrigerant in your system because they are not putting dye in the system and it may be cold when you get it back, it will not last. They don't necessarily put the right amount in either. If the system is overcharged it may not cool either. Most shops are competitive prices on a/c service. I would go to the dealer because they know your car.
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93 NX2000 w/sr20ve
98 Frontier
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