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Short Version:

below the throttle body, on the motor, along the coolant path from the engine to the radiator.

Long version:

I have a 2001 Oldsmobile Alero (V-6). On my car, the top radiator hose is on the left (facing the car with the hood up, naturally) and goes back toward the motor. (For those who do not know what they are looking for, it is a large hose at least 12 inches or longer, it is usually black, and 2-2.5 inches in diameter, and the only other black, large hose nearby to confuse it with is the air intake going from a large black box, aka the air filter housing, to the throttle body). In this cooling system, coolant flows from the motor (after absorbing heat from the motor) to the radiator (just behind the grill) and flows downward through the radiator to the bottom hose (gravity goes down--this bottom hose looks the same as the top hose, but different location) where it runs back towards the motor to collect more heat. The thermostat doesn't actually measure the temperature of the coolant the way the "coolant temperature sensor" does, it is merely a pressure valve that will open with pressure (from hot coolant running through it) and close from a spring (when the coolant is not hot enough, and is therefore not pressurized enough to overcome the spring force of the thermostat valve.) This valve/thermostat is for the sole purpose of regulating coolant temperature; it does this by allowing hot coolant to go to the radiator and cool off, but if your motor is not hot, or up to its optimal operating temperature (for example, when you first turn on the car), the thermostat should recycle the coolant back through the motor, bypassing the radiator, to allow it to heat up.

So, it is located along the flow of coolant after the motor, but before the radiator, and to find it you just need to follow this hose back (away from you and the radiator or grill) to where it ends. This top hose ends with a hose clamp holding it onto a metal pipe. Follow this pipe back towards the motor, and right at that junction is the thermostat housing. In order to get it off for maintenance (in my experience) you'll have to get a few other parts out of your way.

1. drain coolant (about two quarts +/-) so it is below the level you'll be removing parts from

2. remove the air intake hose and filter housing

3. if you can, with the right tools, reach between the throttle body and the exhaust heat-shield to get to the bolts that mount the thermostat housing to the motor. If not, the exhaust heat-shield and/or throttle body will have to be removed as well because they are very in the way of any tools you'd need to reach the bolts.

hope this helps

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12y ago
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3y ago

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Q: Where is the thermostat located on a Oldsmobile Alero?
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