I have a 2000 Oldsmobile Intrigue with a 3.5 v6. It overheats, as I drive the temperture builds. I have replaced the Themostat and the serpentine belt. If I run the car with radiator cap loose it runs higher than normal but doesn't overheat. The service engine light also came on after this problem started.If I rev the engine in nuetral the temperture comes down but goes right back up.
Optional Information:
2000
Oldsmobile Intrigue 3.5L