I own a 1997 Toyota Corolla in moderately good condition, but yesterday I used the A/C for the first time this year and it blew hot air. It happened before, approximately 6 years ago, and I believe there is a very slow freon leak. However, it might be something else so I purchased a can of freon that is packaged with a pressure gauge to show the existing freon levels to verify that the freon was indeed low. However, the gauge that comes with the can will not fit onto the nozzle for the 1997 Corolla. I also own a 2001 Corolla and the same gauge works fine on that car.
Do I need an adapter? Is there a different type of gauge I should look for? How do I check freon levels this car?