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There are 2 capped ports the low and high sides. The freon gauge set will only fit on one of the two ports. The low side. Run the ac attach the freon hose and add as necessary
Automobile A/C system repairs are regulated by the government due to the interaction of FREON with the atmosphere. Being as you are clearly unfamiliar with the system I would advise that you consolt a local garage to do any A/C work on your vehicle.
That being said ; There are TWO sets of Freon lines. One set being the HIGH side which feeds the freon to the compressor . The other being the LOW side . The A/C coolent lines are a closed system and located in the front of the radiator in the form of a Condensor. The Compressor is mounted on the engine and has lines going to and from it . The FREON LINES are rather large aluminum hoses that have , at intervals, flexable rubber lines in thier circuit.
On a 2002 you will note the bright green Valve caps on the shreader valves located the left (passenger side) in the under hood (engine compartment).
look for low side--smallest port close to dryer the high side will be largest,,close to dryer,,round silver canister,,may even be on canister depending what model.hope this helps!!!
On 2001 Montana it is the low pressure side right between the radiator and the front of engine. A plastic cap is on the port (my cap is blue ).look for the aluminum a/c tube. stupid place to put line, lots of heat
it is the one that is blue in color and has an L on it for low pressure. The vapor line is also called the suction line. If your confused, then choose the larger of the two lines near the accumulator.
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