I have a Pontiac Grand Prix GT 1998. She runs great except my A/C is now acting up. I first noticed it a few weeks ago. I was driving and it was almost like someone had turned the air down so it wasn't blowing out as hard. I looked down and turned my knob and it was sitting at 60 (my car has duel climate controls so I checked to make sure duel/passenger side was off and not interfering as well). Few seconds later it all stopped. Lights on the A/C were still on and I could still adjust the temp. I turned it all the way to 90 thinking it was a cold air issue and still nothing. I turned it back to 60 and kept driving. It would randomly turn on and blast glorious cold air and then die again. The longest it has worked continuously since this first started was about 2 days. It's now getting up in the 90s outside and it's miserable to drive anywhere. Please help! I'd like to fix this on my own so any instructions would help as well. I'm a pretty handy lady but haven't had to deal with an A/C issue yet. Thanks!
Has anyone messed with your A/C or Freon recently? If the compressor turns on then instantly stops it could be either you are lacking freon or there is too much in the line. If you over charge most compressors will turn off if it notices the pressure is above a certain limit. When it gets hot outside it also causes the pressure to rise which can cause this issue. What was OK at 80 degrees is too much at 90+.
I'd take it to a Midas or A/C shop, or if you feel comfortable, go to Autozone and buy a recharge kit with a good gauge on it. Find your low pressure port(http://idqusa.com/wp-content/uploads/sites/2/2014/02/98-pontiac-grand-prix-1024x768.jpg) for your A/C system, hook it up and turn your A/C on high. Then follow the instructions. $30 at most for a DIY kit at most auto stores.