you may have a bad thermostat,replace and see.
water leak or bad thermostat
your temp guage will sky rocket if its bad, you may even have coolant a coolant leak (comming out of the the housing of the thermostat). replacing it is easy and cheap.
A bad thermostat can cause overheating in a Nissan Frontier when the air conditioning is turned on. A bad compressor can also cause this.
Low coolant? Control cable not adjusted properly Bad thermostat?
Overheating or engine does not get warm enough. Replace any suspect thermostat. You can test one, but as you have to remove it to do so, just replace it.
You can remove it and place it in a pan of hot water and see if it opens at the proper temperture, but why do that. Once you have it out, just replace it with a new one and you know it is good then. An 15 year old thermostat is more than likely bad. Considering you have to drain the radiator to a low level to remove the thermostat, do a complete cooling system service at this time.
Remove it from car, then place in cup of boiling water, if it opens and closes properly then it still works, if it doesnt move at all, its bad.
The Mercury Villager and Nissan Quest are basically the same vehicle. The radiator is cooled by an electric fan and thermostat. If either of these are malfuntioning, that could be the cause. Otherwise, all of the normal things such as low coolant, bad water pump, clogged radiator, bad radiator hoses, bad thermostat,and incorrect timing could all cause the engine to overheat.
Remove your battery, remove your air filter housing & duct, follow your bottom radiator hose on the driver's side of the car, it will lead you to the thermostat housing. It has three bolts holding it on. Not too bad to change out.
Overheating or no heat from the heater are sure signs it is bad. You car is 12 years old, just replace it if you have a suspicion it is bad. You can test the thermostat but why bother? You will have to remove it to perform the test. Just replace it.
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