300,000 with proper maint
SOURCE: 1999 oldsmobile is overheating
If the previous suggestions don't help, you might want to check your coolant for bubbles; you could have a blown headgasket between the engine's water jacket and a cylinder.
If the gasket fails this way, it will force hot gases into the coolant path that will cause this rapid and intense heating.
The gasket does not have to be failed much to cause this and the early stages won't cause a cylinder to misfire but on cooling, the coolant can enter the cylinder and produce misfires for a few seconds when first started and this can show up as a fouling of one plug which can even show signs of rust if examined.
Also, check your oil dipstick for the color of your oil; it shouldn't look like Jergens lotion.
At the same time, look into the coolant bottle to see what it looks like since a failed gasket can also cause oil to leak into the coolant.
SOURCE: water pump/ coolant leak
in the middle on the front of the motor. You need to remove a plastic shroud.
SOURCE: My 1999 Oldsmobile Cutlass V6 is running way hot.
Make sure the antifreeze is a 50/50 mix and you may want to replace the temperature sensor. The temperature sensor is on the manifold just in front of the thermostat housing and make sure there is no air in the cooling system. Idle the car and place the heater on high to cycle the coolant through the entire system, with the radiator cap on the first click letting any fluid expansion to follow in to the over flow tank and when the engine cools. The radiator will pull the coolant from the over flow tank, once all the coolant has been cycled and no air in the system. Tighten the radiator cap to the second click and that should help you burp the coolant system. As for the temperature running hot could be a faulty sensor, so replace it and it not that expensive and take under 15 min to replace. Good luck friend.
SOURCE: coolant not circulating
I assume you know that the only circulation happening unti lthe thermostat opens at its nominal temperature is through the heater core if in use.
If peering into the radiator opening, you will not see more than the most minimal movement until the thermostat opens.
You may have an airlock in the system and it could be in the heater lines so if you have done a coolant change or had the system open, you need to purge the system of air.
If you have no radiator cap like many newer vehicles, this isn't as easy to accomplish.
You will have to pass through several cycles of warmup and cool-down and each time refill the reservoir to the marked level with coolant mix.
During this, you will have to have the heater control set to warm the interior so that the coolant is forced to circulate throughout the whole system.
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