2001 Pathfinder overheating
2001 Pathfinder, 61k miles. Couple of weeks ago, heater stopped working and engine was running a liitle cool. I assumed this was the thermostat gone bad, no other problems at the time. Last weekend, engine overheated, spewed a little cooolant. Took it to the shop, had it pressure tested no leaks, shop replaced thermostat and everything was working well. Then today, same thing happend, heater stopped working and a few minutes later engine ran hot. What could cause the thermostat to go bad again? This sounds like classic bad thermostat to me -- any other thoughts? Also I read on another thread that the 2001 Pathfinder has two thermostats -- one is on the top of the engine where the hose goes from the radiator to the engine block, where is the second and what purpose does it serve?