1999 Chevy Blazer Hot and Cold

1999 CHEVROLET BLAZER
135,754 MILES • 6 CYL • 4WD • AUTOMATIC
Avatar
KAT_E_Q
  • MEMBER
  • 1 POST
My car is blowing HOT air for a few seconds then it blows cold air for a few seconds and then back to hot when the air conditioner is on. I tried turning the nob from HOT to COLD slowly, thinking that it maybe wasn't tripping the sensor, but that did not work. I have made sure that there is not a freon leak in the A/C system and that the level is full. Does this sound like a problem with the temperature sensor?

I also am having a problem with what I think is the electrical system. The button to open the hatch in the back is no longer working, and the automatic door locks are also not working from inside the car (I have to use the remote to lock and unlock the doors). I checked the fuses and it doesn't seem to be that.
Apr 14, 2010 at 12:33 PM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
As far as the AC, have the blend air door checked. It determines if you get AC or heat. If it isn't working properly, this would be the result.

As far as the locks, have you checked to see if there is power to the switch on the driver's door?
Apr 15, 2010 at 10:29 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.