Having problems with your 2006 Pontiac Grand Prix ?
PONTIAC GRAND PRIX 06' HEAT BLOWS COLD AND ENGINE OVER HEATS
If you are not loosing coolant and you are not hearing any noises then change your thermostat.
Repair Help & Product Troubleshooting for 2006 Pontiac Grand Prix
Tips for a great answer:- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.