1999 Chevrolet Blazer: A/C Won\'t Stay On
By 
Marty Padgett, Editorial Director, October 10th, 2007 October 10th, 2007
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Q--The A/C on my 1999 Chevy Blazer will come on for a few minutes then will start blowing hot air. Then sometimes it will come on and work for quite a while. What’s the problem?
A--I suspect that the evaporator (the heat exchanger behind the dash) may be icing up. Moisture from the air collects on the fins, turns to ice and blocks airflow. Sometimes, this will be accompanied by water on the floor as the ice melts or moisture may come from the vents. The most likely cause is a plugged drain in the evaporator housing preventing the water from draining on the ground like it is supposed to.
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