How to remove the thermostat on Toyota 4Runner?

The first step to take the thermostat out of the 2UZ-FE cooling system consists of draining all engine coolant. You must detach the water inlet from its housing after taking off the 3 housing nuts. Start by taking off the thermostat device along with its corresponding gasket. The coolant performance deteriorates when you remove the thermostat which means you should not detach it unless your engine rarely overheats.

How to service and repair a thermostat on Toyota 4Runner?

The first step for servicing or repairing the thermostat includes draining engine coolant then disconnecting the lower radiator hose. You need to remove the thermostat by disassembling the water pump where you detach its three nuts and wire clamp and water inlet and thermostat along with its gasket. After that remove the gasket from the thermostat. Adults should test the thermostat function by submerging it in water and conducting a temperature test to verify the valve opens between 80 - 84 degrees Celsius (176 - 183 degrees Fahrenheit) and achieves a lift of 8.5 mm (0.335 inch) at 95 degrees Celsius (203 degrees Fahrenheit). Thermostat replacement is needed if the specifications fail to meet the requirements. Complete valve closure is required at temperatures below 40 degrees Celsius (104 degrees Fahrenheit). Failure to achieve proper valve closure indicates the need to replace the thermostat. Installation of the thermostat requires a new gasket and placement of the jiggle valve in the downward position before screwing three bolts which should be torqued to 20 Nm (200 kgf-cm, 14 ft. lbs.). Connection of lower radiator hose follows by engine coolant filling and engine start-up permits leak detection.

OEM Toyota 4Runner Thermostat

Engine Coolant Thermostat

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8 Thermostats found

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Toyota 4Runner Thermostat
Part Number: 90916-03083
$21.98 MSRP: $30.59
You Save: $8.61 (29%)
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Product Specifications
- Other Name: Engine Coolant Thermostat; Thermostat, Coolant
- Replaces: 90916-03037-72, 90916-03054, 90916-03034, 90916-03037, 90916-03016, 90916-03035, 90916-03028, 90916-03033, 90916-03056
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1985 Toyota 4Runner | SR5 | 4 Cyl 2.4 L GAS
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Toyota 4Runner Thermostat
Part Number: 90916-03138
$41.45 MSRP: $57.70
You Save: $16.25 (29%)
Ships in 1 Business Day
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Product Specifications
- Manufacturer Note: *WAX 82-95
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2007-2009 Toyota 4Runner | Limited, Sport, SR5 | 8 Cyl 4.7 L GAS
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Toyota 4Runner Thermostat
Part Number: 90916-03120
$27.59 MSRP: $38.41
You Save: $10.82 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Engine Coolant Thermostat; Thermostat, Coolant
- Manufacturer Note: *WAX 82-95
- Replaces: 90916-03088, 90916-03101
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1996-2000 Toyota 4Runner | Base | 4 Cyl 2.7 L GAS
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Toyota 4Runner Thermostat
Part Number: 90916-03100
$26.40 MSRP: $36.75
You Save: $10.35 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Engine Coolant Thermostat
- Manufacturer Note: *WAX 82-95
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2003-2007 Toyota 4Runner | Limited, Sport, SR5 | 6 Cyl 4.0 L GAS, 8 Cyl 4.7 L GAS
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Toyota 4Runner Thermostat
Part Number: 90916-03093
$22.57 MSRP: $31.42
You Save: $8.85 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Engine Coolant Thermostat; Thermostat, Coolant
- Manufacturer Note: *WAX 82-95
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2010 Toyota 4Runner | SR5 | 4 Cyl 2.7 L GAS
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Toyota 4Runner Thermostat
Part Number: 90916-03079
$27.83 MSRP: $38.74
You Save: $10.91 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Engine Coolant Thermostat
- Manufacturer Note: *WAX 82-95
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1989-1995 Toyota 4Runner | DLX, SR5 | 6 Cyl 3.0 L GAS
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Toyota 4Runner Thermostat
Part Number: 90916-03078
$21.98 MSRP: $30.59
You Save: $8.61 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Engine Coolant Thermostat; Thermostat, Coolant
- Manufacturer Note: *WAX 88-100
- Replaces: 90916-03036, 90916-03040, 90916-03022, 90916-03055, 90916-03029, 90916-03023
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1984-1995 Toyota 4Runner | DLX, SR5 | 4 Cyl 2.4 L GAS
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Toyota 4Runner Thermostat
Part Number: 90916-03075
$27.59 MSRP: $38.41
You Save: $10.82 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Engine Coolant Thermostat; Thermostat, Coolant
- Manufacturer Note: *WAX 82-95
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1996-2002 Toyota 4Runner | Base, Limited, SR5 | 6 Cyl 3.4 L GAS

Toyota 4Runner Thermostat

Choose genuine Thermostat that pass strict quality control tests. You can trust the top quality and lasting durability. Shopping for OEM Thermostat for your Toyota 4Runner? Our website is your one-stop destination. We stock an extensive selection of genuine Toyota 4Runner parts. The price is affordable so you can save more. It only takes minutes to browse and find the exact fit. Easily add to cart and check out fast. Our hassle-free return policy will keep you stress-free. We process orders quickly for swift delivery. Your parts will arrive faster, so you can get back on the road sooner.

Toyota 4Runner Thermostat is an essential part of the car that is found in between the aluminum housing of the radiator and the vehicle engine. One of its main uses is to control the coolant flow to the engine to maintain its temperature, when the desired temperature is met, it closes. This mechanism ensures that the engines are on and warmed up much faster, less wear, enhanced efficiency, and minimal emission. Some 4Runner may face problems such overheating though at times it may take some time after replacing the thermostat, the water pump, and radiator cap to stop. The supply of fresh coolant must be done regularly to avoid formation of some minerals on the radiators. If the car radiator is cold, while the engine is hot, then this is ideal time to work on the thermostat replacement task.

Toyota 4Runner Thermostat Parts and Q&A

Thermostat
90916-03138
Q: How to remove the thermostat on Toyota 4Runner?
A:
The first step to take the thermostat out of the 2UZ-FE cooling system consists of draining all engine coolant. You must detach the water inlet from its housing after taking off the 3 housing nuts. Start by taking off the thermostat device along with its corresponding gasket. The coolant performance deteriorates when you remove the thermostat which means you should not detach it unless your engine rarely overheats.
Thermostat
90916-03075
Q: How to service and repair a thermostat on Toyota 4Runner?
A:
The first step for servicing or repairing the thermostat includes draining engine coolant then disconnecting the lower radiator hose. You need to remove the thermostat by disassembling the Water Pump where you detach its three nuts and wire clamp and water inlet and thermostat along with its gasket. After that remove the gasket from the thermostat. Adults should test the thermostat function by submerging it in water and conducting a temperature test to verify the valve opens between 80 - 84 degrees Celsius (176 - 183 degrees Fahrenheit) and achieves a lift of 8.5 mm (0.335 inch) at 95 degrees Celsius (203 degrees Fahrenheit). Thermostat replacement is needed if the specifications fail to meet the requirements. Complete valve closure is required at temperatures below 40 degrees Celsius (104 degrees Fahrenheit). Failure to achieve proper valve closure indicates the need to replace the thermostat. Installation of the thermostat requires a new gasket and placement of the jiggle valve in the downward position before screwing three bolts which should be torqued to 20 Nm (200 kgf-cm, 14 ft. lbs.). Connection of lower radiator hose follows by engine coolant filling and engine start-up permits leak detection.