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

Service and repairs of the thermostat start with drained engine coolant followed by V-bank cover uninstallation. Release the No.2 hose clamp or clip on the radiator outlet before erasing the water inlet and thermostat and gasket by removing the 3 nuts. Begin by checking the magnitude of water valve opening temperature on the thermostat before dipping it into water and heating the water slowly as you confirm the valve opening temperature falls between 80 to 84 degrees Celsius (176 to 183 degrees Fahrenheit). Replacement of the thermostat must be done when the valve opening temperature does not match the specified range of 80 to 84 degrees Celsius (176 to 183 degrees Fahrenheit). The valve lift needs inspection while the water reaches 95 degrees Celsius (203 degrees Fahrenheit) because any measurement under 8.0mm (0.31 in.) requires a thermostat replacement. A fully sealed valve must exist prior to a thermostat reading below 40 degrees Celsius (104 degrees Fahrenheit). Replacement of the thermostat becomes necessary if the valve remains open. New gasket installation begins with placing it on the water inlet that includes the thermostat then tightening the 3 nuts to 9.0 Nm (92 kgf/cm, 80 in. lbs.). First reconnect the radiator outlet using the No.2 hose clamp or clip while adding engine coolant before checking for leaks. Use the provided 2 nuts to reinstall the V-bank cover and torques them to 7.5 Nm (76 kgf/cm, 66 in. lbs.).

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%)
Ships in 1 Business Day
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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
ADD TO CART
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
View related parts
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

If you're thinking about purchasing OEM parts for your Toyota 4Runner, our website is your one-stop destination. We stock an extensive selection of genuine Toyota 4Runner Thermostat at pocket-friendly prices. Plus, we guarantee a swift delivery and a hassle-free return policy for your convenience.

Toyota 4Runner Thermostat Parts Questions & Experts Answers

Thermostat
90916-03100
Q: How to service and repair the thermostat on Toyota 4Runner?
A: Service and repairs of the thermostat start with drained engine coolant followed by V-bank cover uninstallation. Release the No.2 hose clamp or clip on the radiator outlet before erasing the water inlet and thermostat and gasket by removing the 3 nuts. Begin by checking the magnitude of water valve opening temperature on the thermostat before dipping it into water and heating the water slowly as you confirm the valve opening temperature falls between 80 to 84 degrees Celsius (176 to 183 degrees Fahrenheit). Replacement of the thermostat must be done when the valve opening temperature does not match the specified range of 80 to 84 degrees Celsius (176 to 183 degrees Fahrenheit). The valve lift needs inspection while the water reaches 95 degrees Celsius (203 degrees Fahrenheit) because any measurement under 8.0mm (0.31 in.) requires a thermostat replacement. A fully sealed valve must exist prior to a thermostat reading below 40 degrees Celsius (104 degrees Fahrenheit). Replacement of the thermostat becomes necessary if the valve remains open. New gasket installation begins with placing it on the water inlet that includes the thermostat then tightening the 3 nuts to 9.0 Nm (92 kgf/cm, 80 in. lbs.). First reconnect the radiator outlet using the No.2 hose clamp or clip while adding engine coolant before checking for leaks. Use the provided 2 nuts to reinstall the V-bank cover and torques them to 7.5 Nm (76 kgf/cm, 66 in. lbs.).