Having problems with your 1999 Pontiac Grand Prix ?
One side hot other side cold
\015 Air condition was on\015
If you have dual controls for temperature for passenger and driver, they may be set to different levels, try to push the driverside temp control switch or knob in and this will give driver control over both sides again
Repair Help & Product Troubleshooting for 1999 Pontiac Grand Prix
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