1998 GMC Jimmy a/c blows hot air all time

1998 GMC JIMMY
200,000 MILES • 6 CYL • 4WD • AUTOMATIC
Avatar
SCRAPPY69
  • MEMBER
  • 1 POST
jumpd pressure switch got it to take 2 cans freon as soon as i unplug jumper compressor kicks off cans get real cold when adding to system has automatic climate control but blows hot comp wont come on when driving hear clicking an hot air jumps from def to vents to floor when switch is off no matter where the switch does same thing???
Jul 28, 2010 at 12:10 PM
Advertisement
Avatar
HMAC300
  • CERTIFIED EXPERT
  • 48,601 POSTS
probably your low pressure switch is bad as i'm assuming that is the one you jumped. And yes freon cans will get cold when adding to a system and if you don't do it right you won't get enough in or to much as it sounds as if you aren't using gauges so you have no idea of how much you have in. It also sounds like your vacuum is leaking or the switch is bad due to it won't stay in one position....
Jul 30, 2010 at 5:48 PM