slight overheating in warmer weather? 96 olds ciera sl
I have a 96 olds ciera sl (not cutlass), 6 cyl. My only problem with it is when the weather heats up, the car wants to heat up to. It only does it after going up a long hill or like while its slowly going thru like a fastfood drive thru. It normally runs on first notch above cold but heats up to at least halfway until I get moving again on the road. What cld b causing this? I've been told thermostat, fan not kicking on, and few other reasons. I don't think its the fan though.