I want to recharge my ac on my 2003 Ford Focus ZX-3 but I am not sure if I found the port or not. The port I found is made out of plastic and has a green cap on it, is that the right place, I thought the port and lines were usually metal.
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If you reach up under the fender on the front passengers side in front of the front wheel, you will feel the reciever dryer(accumulator) assembly. The low side a/c port is located there(not the best place to have it in my opinion). The high side port is located where the front grill meets the upper radiator support.
I hope this helps you out. And also if you are looking for a leak, check the snout seal located under the outer clutch disc. Remove the compressor clutch disc and check for leakage. The compressor bodies themselves were also known for leaking.
Sounds like a leak. If you've had to recharge the system every year, you're losing refrigerant. If you've added refrigerant on your own, you may have overcharged the system. The best way to find out is to get a refrigerant pressure gauge and check the pressure. A reading between 30-40 psi is in the normal range. Below 30 will require a recharge, above will require releasing refrigerant.
Sounds like the A/C system just needs to be recharged. When was the last time you had this done? Just take it in to your mechanic and he can do it for you and if that's not it for some reason, then he will be able to find the problem but most likely you need more freon added.