Hi there, I think I have a bad thermostat on my '07 Grand Caravan SE. Blowing cold air when I turn the heater on, temp gauge stays dead center, but now my coolant level light came on while driving. My reservoir level was at MIN, so I filled it to MAX, started it back up and the light went off. Any recommendations on which thermostat to pick up and not break the bank? I need to pick up the gasket for it too, right?