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

To repair the thermostat, drain the coolant, remove the V-bank cover, and disconnect the radiator outlet. Remove the water inlet, thermostat, and gasket. Check the thermostat's valve opening temperature (80-84°C) and lift (min. 8.0 mm at 95°C). Replace if necessary, then reinstall with a new gasket and check for leaks.

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

In order to fix the thermostat, de-exhaust the radiator and remove the lower radiator hose. Take out the thermostat and check in hot water, it should open at 80-84°C and rise 8.5 mm at 95°C. Replace if necessary. Install a new gasket, fix, refill the coolant, and leak check.

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
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:
- 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

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 and Q&A

Thermostat
90916-03100
Q: How to service and repair the thermostat on Toyota 4Runner?
A: To repair the thermostat, drain the coolant, remove the V-bank cover, and disconnect the radiator outlet. Remove the water inlet, thermostat, and gasket. Check the thermostat's valve opening temperature (80-84°C) and lift (min. 8.0 mm at 95°C). Replace if necessary, then reinstall with a new gasket and check for leaks.
Thermostat
90916-03075
Q: How to service and repair a thermostat on Toyota 4Runner?
A: In order to fix the thermostat, de-exhaust the radiator and remove the lower radiator hose. Take out the thermostat and check in hot water, it should open at 80-84°C and rise 8.5 mm at 95°C. Replace if necessary. Install a new gasket, fix, refill the coolant, and leak check.