Running Hot
 

Hello all,
I've made the mistake and run my battery down a few times in the past when my car's lights are left on. No problem really, but if I don't have a fully charged battery, when my car runs, the car overheat's quickly. Is there any reason my car overheat's only if my engine's battery is low?
If I need a new thermostat, what Temp do I need?
My car:
2G 1997 Mitsubishi Eclipse Spyder GST
Thanks all!