Having problems with your 1999 Pontiac Grand Prix ?
A/C and heater only works on high
\015 I have replaced the blowor motor and regulator and i still have the issue where it only blows on high (5) and my lower speeds dont even allow my a/c to be on at all.\015
I had a problem like this on my 1999 grand prix gt. My headlights would cut out on any setting less then high (5), and my re-defroster wouldn't work. After ALOT of research I found out the it is the ignition wiring harness. I went to Advanced auto and they got me that for i think around $100ish. I hope this helps
Check your blower motor resistor, it may be bad.
Repair Help & Product Troubleshooting for 1999 Pontiac Grand Prix
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