The van starts to run hot when at a stand-still. on 1998 Pontiac Trans Sport

The van starts to run hot when at a stand-still but when I start to move again it goes down and stops at about 210. If I stop again it starts to go up. The fans to kick on but they come on late when its closer to running hot. Whats going on with it running hot?

Asked by for the 1998 Pontiac Trans Sport
It's hard to say exactly whats wrong without being able to do some basic diagnostic tests. The engine does not need the fans at all driving down the road at 30mph or greater rush air flowing through the radiator should keep the engine cool, it is when you are stuck idling in traffic you need the electric fan to cool coolant in the radiator. Without getting your hands caught in the fan blades I wonder if the radiator is efficient and has no "cold spots" due to restricted radiator tubes. I wonder if the thermostat is opening fully and if the radiator fan switch is turning the fan on soon enough. Do you have a wiring diagram/workshop manual? Autozone have some popular workshop manuals for free on line once you register (for free) on their website There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate