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1990 GMC C1500 CLIMATE CONTROL

Tiny
DIANA RAMIREZ
  • MEMBER
  • 1990 GMC C1500
  • V8
  • 2WD
  • AUTOMATIC
  • 241,009 MILES
MY CLIMATE CONTROL DOES NOT ALWAYS SWITCH OVER. FOR INSTANCE. COUPLE OF DAYS AGO I USED HEATER IN THE MORNING. WHEN I SWITCHED OVER TO A/C HOT AIR COMES OUT. IT USED TO TAKE ONLY A FEW MINUTES OR ABOUT A DAY TO SWITCH OVER AND THIS LAST TIME ITS TAKEN LONGER. AND BECAUSE IT ONLY TOOK A WHILE FOR IT TO SWITCH TO PROPER CLIMATE, THATS HOW I KNOW THE HEATER AND A/C WORK PROPERLY. THATS HOW WE FIGURED IT WAS THE CLIMATE CONTROL. THANK YOU
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Friday, October 22nd, 2010 AT 4:37 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You should have a vacuum or electric switch on the climate control. It's probably vacuum and leaking, that'swhy it's taking long to switch over. There also is an actuator on the heater box there are 2 and one of them may not work correctly due to the low vacuum or one of the motors being bad.
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Friday, October 29th, 2010 AT 5:42 PM

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