Over the past few months my 2002 Grand Prix GT (125,000 niles) has been over heating while idling and I had no heat in the car. I replaced the thermostat and coolant which solved the over-heating issue but I still have no heat in the car. The only time the heat will come on (blow hot air instead of cool) is when I am going 70mph+. I noticed a small oil leak on the garage floor so when I changed the oil today, the whole bottom side of the engine is covered in oil.
I replaced the intake manifold gasket 2 years ago. I have no mixing of oil to coolant or vise versa. The oil level was a little lower then usual today when I changed it, don't know if that makes a difference.
Any help would be much appreciated!!
Thank You for your time!
Nick
-Minnesota