AC blows hot air in '98 with 2.4

[Ric Kelly]

My grandson recently obtained a '98 Grand Am SE for his first vehicle. I have been volunteered to work on it.
First and foremost, with summer fast approaching, I need to get the AC working! I went and bought a can of 134 refrigerant and proceeded under the hood to recharge it. I can not find the low pressure port! There are two ports between the engine and radiator ... the high pressure (larger one) and another pretty much right under it on a plastic Tee with a green cap on it with a tag that states "low pressure service port <1 PSI" or something close to that. The tee is attached to vacuum size hoses, one of which goes to a small box on top of the compressor. The engine tag on the passenger side strut tower shows a diagram showing the evaporator can in the right front fender well, in front of the tire. I found that but, no low pressure port!
This brings my question! Someone know where the port is to charge the AC or does it have to be professionally serviced?

 

[melsg5]

see the diagram on this link

http://www.justanswer.com/pontiac/3ktvt-finding-low-cap-recharge-coolant-97-grand-am.html

 

[Ric Kelly]

Nope, crawled under the car and looked ... nothing on either line coming out of the compressor.

 

[Ric Kelly]

Melsg5, got under the car again yesterday between rain showers ... the port was exactly where the diagram shows it to be! The blue cap was, ... well kinda camouflaged black! Didn't empty but, kinda equalized the pressure in the can I had. Will have to get another. Is there a chance I have to, like, "burp" the air out of the system or, should it take care of itself? I know when shops recharge, they hook up to both ports and circulate the whole system to fill, right?

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[melsg5]

you should not have air in the A/C system unless it sucks in through a leak on the low pressure side. The shops use pressure gauges to determine the correct fill.