1.) WITH THE ENGINE OFF! and the ENGINE COLD! -take the radiator cap off and see if you can see water (or coolant) inside. If not, add enough water or coolant until it you can see it. Put the cap back on securely.
2.) WITH THE ENGINE OFF! and the ENGINE COLD!-Check to see if the belt that runs over the pulley that turns the fan behind the radiator is tight. It should push in about an inch by just pushing it with your finger. If not, tighten it or have a mechanic do it for you.
3.) WITH THE ENGINE OFF!-Check to make sure you have enough engine oil in the engine.
To keep the car engine from over heating
if it is losing it thru the overflow pipe you need a new radiator cap
thermostat help fan come on when the car is runnning, keep the engine from over heating
A/C and heating unit
your car is over heating
If it is not actually over heating, then if the smell is outside the car, look for coolant leaks around the head and the thermostat cover. Inside the car could be a leaking heater coil.
Just because there is a leak doesn't mean it will overheat instantly, but if you do not keep adding coolant or fix the leak you will have engine problem
If your car is over heating you may want to check your thermostat and replace it may solve your over heating problems
that's because car was on too long. that's because car was on too long.
Can result in freezing in the winter and over-heating in the summer.
Many things can go wrong with a car radiator. Since the car radiators job is to keep the car from over heating, the radiator can become to hot and become damaged, and it can also become clogged with dirt and debris. A car radiator can also become rusted and sludge can get built up in the wires which will cause it to over heat.
If your Pathfinder is over heating then you may have an issue with the coolant. You can try adding more coolant to ensure that your car is no longer over heating. You can also double check to make sure your blower is actually cooling your engine.