I got a bottle of 134a and a hose with a gauge. I was trying to connect the gauge onto the low pressure service port but it wouldn't go on. Every time I press the gauge onto the service port green fluid comes out. And the needle on the gauge doesn't move at all.
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You need to pull the collar back on the gauge connection side. It should go right on if you are using the correct port on the car. One is bigger than the other.
Alex