How to check and replace a thermostat in a cooling system on Toyota Highlander?

Unless you want to think that the cooling system problem is a fault of the thermostat, try to inspect the coolant level, the tension of the drive-belt, and the function of the temperature gauge. If the engine takes a long time to warm up, the thermostat is most probably stuck open and should therefore be replaced. If the engine is hot and the lower radiator hose is cool, the thermostat may be stuck shut and not allowing the coolant to go into the radiator; thermostats should therefore be replaced. If the lower radiator hose is hot, then coolant is circulating thus the thermostat is open. It is important to eliminate the thermostat; that is, if the socket is open at room temperature, the thermostat is bad. To test it, put the closed thermostat on boiling water with a thermometer in it with no portion of the thermometer in contact with the sides of the container and heat the water while observing the changes in the thermostat. Pay attention to the degree of opening at which the air curtain starts expelling air and when it is fully operative; this has to be checked against the standard temperature. This should be replaced if it does not perform as it is expected to do so in the course of using the equipment. To replace, remove the negative battery terminal, lift the car properly, take out the lower part of the engine and the fender splash shield, drop the Coolant and remove the Radiator hose connecting to the thermostat housing. Take off the drive belt, and, in the case of Lexus RX330, starter. For four-cylinder models, unbolt the alternator, disconnect the radiator hose from the thermostat housing, and remove the housing The thermostat should also be removed and sealing surfaces cleaned. Replace a gasket and the thermostat that is equipped with the jiggle valve in the upper position. For the V6 versions, take off the air filter, then unscrew the water inlet pipe, and uncouple the radiator hose. Take out the thermostat housing and put a new gasket and correctly position the jiggle valve. On 2GR-FKS engines, the wiper motor and linkage, the air filter housing and the battery tray if required should be removed. The thermostat housing assembly should be gotten rid of with its electrical connector and bypass and radiator hoses thrown in; it should then be put in as a single assembly. Inspect for squeaks, vibration, and component alignment, then tighten the housing fasteners to the torque out of the use and fill with the coolants, start the engine, and confirm its normal operation and leakage.

Genuine Toyota Highlander Thermostat

Engine Coolant Thermostat

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Toyota Highlander Thermostat
Part Number: 90916-A3003
$22.60 MSRP: $31.59
You Save: $8.99 (29%)
ADD TO CART
Product Specifications
- Replaces: 90916-03129, 90916-03084
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2001-2019 Toyota Highlander | Grande, Limited, Medium, STD, Sport | 4 Cyl 2.4L, 4 Cyl 2.7L, 6 Cyl 3.0L, 6 Cyl 3.3L, 6 Cyl 3.5L | 1ARFE, 1MZFE, 2AZFE, 2GRFE, 2GRFKS, 2GRFXE, 2GRFXS, 2GRFXS; ASU40L-ARTNKA, 3MZFE; ACU20L-BRPNKA, ACU20L-BWPNKA, ACU25L-BRPNKA, ACU25L-BWPNKA, ASU40L-ARTNKA, ASU40L-BRTNKA, ASU50L-ARTNKA, GSU40L-ARAGKA, GSU40L-ARAMKA, GSU40L-ARANKA, GSU40L-ARASKA, GSU40L-BRAGKA, GSU40L-BRAMKA, GSU40L-BRANKA, GSU40L-BRASKA, GSU45L-ARAGKA, GSU45L-ARAMKA, GSU45L-ARANKA, GSU45L-ARASKA, GSU45L-BRAGKA, GSU45L-BRAMKA, GSU45L-BRANKA, GSU45L-BRASKA, GSU50L-ARTGKA, GSU50L-ARTMKA, GSU50L-ARTNKA, GSU50L-ARZGHA, GSU50L-ARZMHA, GSU50L-ARZNHA, GSU55L-ARTGKA, GSU55L-ARTMKA, GSU55L-ARTNKA, GSU55L-ARZGHA, GSU55L-ARZMHA, GSU55L-ARZNHA, GVU48L-BRXGKA, GVU48L-BRXNKA, GVU58L-ARXGHA, GVU58L-ARXGKA, GVU58L-ARXMHA, GVU58L-ARXMKA, GVU58L-ARXNHA, GVU58L-ARXNKA, MCU20L-BWPNKA, MCU23L-BRANKA, MCU23L-BWANKA, MCU25L-BWPNKA, MCU28L-BRANKA, MCU28L-BWANKA, MHU23L-BRXNKA, MHU23L-BWXNKA, MHU28L-BRXNKA, MHU28L-BWXNKA, MHU48L-BRXMKA, MHU48L-BRXNKA
View related parts
Toyota Highlander Thermostat
Part Number: 90916-03129
$22.60 MSRP: $31.59
You Save: $8.99 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Replaced by: 90916-A3003
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2004-2019 Toyota Highlander | Grande, Limited, Medium, Sport, STD | 4 Cyl 2.4L, 4 Cyl 2.7L, 6 Cyl 3.0L, 6 Cyl 3.3L, 6 Cyl 3.5L | 1ARFE, 1MZFE, 2AZFE, 2GRFE, 2GRFKS, 2GRFXE, 2GRFXS, 3MZFE; ACU20L-BRPNKA, ACU20L-BWPNKA, ACU25L-BRPNKA, ACU25L-BWPNKA, ASU40L-ARTNKA, ASU40L-BRTNKA, ASU50L-ARTNKA, GSU40L-ARAGKA, GSU40L-ARAMKA, GSU40L-ARANKA, GSU40L-ARASKA, GSU40L-BRAGKA, GSU40L-BRAMKA, GSU40L-BRANKA, GSU40L-BRASKA, GSU45L-ARAGKA, GSU45L-ARAMKA, GSU45L-ARANKA, GSU45L-ARASKA, GSU45L-BRAGKA, GSU45L-BRAMKA, GSU45L-BRANKA, GSU45L-BRASKA, GSU50L-ARTGKA, GSU50L-ARTMKA, GSU50L-ARTNKA, GSU50L-ARZGHA, GSU50L-ARZMHA, GSU50L-ARZNHA, GSU55L-ARTGKA, GSU55L-ARTMKA, GSU55L-ARTNKA, GSU55L-ARZGHA, GSU55L-ARZMHA, GSU55L-ARZNHA, GVU48L-BRXGKA, GVU48L-BRXNKA, GVU58L-ARXGHA, GVU58L-ARXGKA, GVU58L-ARXMHA, GVU58L-ARXMKA, GVU58L-ARXNHA, GVU58L-ARXNKA, MCU20L-BWPNKA, MCU23L-BRANKA, MCU23L-BWANKA, MCU25L-BWPNKA, MCU28L-BRANKA, MCU28L-BWANKA, MHU23L-BRXNKA, MHU23L-BWXNKA, MHU28L-BRXNKA, MHU28L-BWXNKA, MHU48L-BRXMKA, MHU48L-BRXNKA
View related parts
Toyota Highlander Thermostat
Part Number: 90916-A3002
$24.15 MSRP: $33.74
You Save: $9.59 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Replaces: 90916-A3001, 90916-03140, 90916-03133
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2008-2017 Toyota Highlander | Grande, Limited, Medium, STD, Sport | 4 Cyl 2.7L, 6 Cyl 3.3L, 6 Cyl 3.5L | 1ARFE, 2GRFE, 2GRFKS, 2GRFXE, 2GRFXS, 2GRFXS; ASU40L-ARTNKA, 3MZFE; ASU40L-ARTNKA, 3MZFE; ASU40L-BRTNKA, ASU40L-BRTNKA, ASU50L-ARTNKA, GSU40L-ARAGKA, GSU40L-ARAMKA, GSU40L-ARANKA, GSU40L-ARASKA, GSU40L-BRAGKA, GSU40L-BRAMKA, GSU40L-BRANKA, GSU40L-BRASKA, GSU45L-ARAGKA, GSU45L-ARAMKA, GSU45L-ARANKA, GSU45L-ARASKA, GSU45L-BRAGKA, GSU45L-BRAMKA, GSU45L-BRANKA, GSU45L-BRASKA, GSU50L-ARTGKA, GSU50L-ARTMKA, GSU50L-ARTNKA, GSU50L-ARZGHA, GSU50L-ARZMHA, GSU50L-ARZNHA, GSU55L-ARTGKA, GSU55L-ARTMKA, GSU55L-ARTNKA, GSU55L-ARZGHA, GSU55L-ARZMHA, GSU55L-ARZNHA, GVU48L-BRXGKA, GVU48L-BRXNKA, GVU58L-ARXGHA, GVU58L-ARXGKA, GVU58L-ARXMHA, GVU58L-ARXMKA, GVU58L-ARXNHA, GVU58L-ARXNKA, MHU48L-BRXMKA, MHU48L-BRXNKA
View related parts
Toyota Highlander Thermostat
Part Number: 90916-03084
$22.60 MSRP: $31.59
You Save: $8.99 (29%)
ADD TO CART
Product Specifications
- Replaced by: 90916-A3003
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2001-2005 Toyota Highlander | 4 Cyl 2.4L, 6 Cyl 3.0L, 6 Cyl 3.3L | 1MZFE, 2AZFE, 3MZFE; ACU20L-BRPNKA, ACU20L-BWPNKA, ACU25L-BRPNKA, ACU25L-BWPNKA, MCU20L-BWPNKA, MCU23L-BRANKA, MCU23L-BWANKA, MCU25L-BWPNKA, MCU28L-BRANKA, MCU28L-BWANKA
View related parts
Toyota Highlander Thermostat
Part Number: 90916-03136
$28.07 MSRP: $39.24
You Save: $11.17 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Replaces: 90916-C3001
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2005-2007 Toyota Highlander | 4 Cyl 2.4L, 6 Cyl 3.3L | 2AZFE, 3MZFE; ACU20L-BRPNKA, ACU20L-BWPNKA, ACU25L-BRPNKA, ACU25L-BWPNKA, MCU23L-BRANKA, MCU23L-BWANKA, MCU28L-BRANKA, MCU28L-BWANKA
View related parts
Toyota Highlander Thermostat
Part Number: 90916-03140
$24.15 MSRP: $33.74
You Save: $9.59 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Replaced by: 90916-A3002
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2008-2017 Toyota Highlander | Grande, Limited, Medium, Sport, STD | 4 Cyl 2.7L, 6 Cyl 3.3L, 6 Cyl 3.5L | 1ARFE, 2GRFE, 2GRFKS, 2GRFXE, 2GRFXS, 3MZFE; ASU40L-ARTNKA, ASU40L-BRTNKA, ASU50L-ARTNKA, GSU40L-ARAGKA, GSU40L-ARAMKA, GSU40L-ARANKA, GSU40L-ARASKA, GSU40L-BRAGKA, GSU40L-BRAMKA, GSU40L-BRANKA, GSU40L-BRASKA, GSU45L-ARAGKA, GSU45L-ARAMKA, GSU45L-ARANKA, GSU45L-ARASKA, GSU45L-BRAGKA, GSU45L-BRAMKA, GSU45L-BRANKA, GSU45L-BRASKA, GSU50L-ARTGKA, GSU50L-ARTMKA, GSU50L-ARTNKA, GSU50L-ARZGHA, GSU50L-ARZMHA, GSU50L-ARZNHA, GSU55L-ARTGKA, GSU55L-ARTMKA, GSU55L-ARTNKA, GSU55L-ARZGHA, GSU55L-ARZMHA, GSU55L-ARZNHA, GVU48L-BRXGKA, GVU48L-BRXNKA, GVU58L-ARXGHA, GVU58L-ARXGKA, GVU58L-ARXMHA, GVU58L-ARXMKA, GVU58L-ARXNHA, GVU58L-ARXNKA, MHU48L-BRXMKA, MHU48L-BRXNKA
View related parts
Toyota Highlander Thermostat
Part Number: 90916-03133
$24.15 MSRP: $33.74
You Save: $9.59 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Replaced by: 90916-A3002
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2008 Toyota Highlander | Grande, Limited, Sport, STD | 4 Cyl 2.7L, 6 Cyl 3.3L, 6 Cyl 3.5L | 1ARFE, 2GRFE, 3MZFE; ASU40L-BRTNKA, GSU40L-BRAGKA, GSU40L-BRAMKA, GSU40L-BRANKA, GSU40L-BRASKA, GSU45L-BRAGKA, GSU45L-BRAMKA, GSU45L-BRANKA, GSU45L-BRASKA, MHU48L-BRXMKA, MHU48L-BRXNKA

Toyota Highlander Thermostat

Thermostat is a vital part of the car's cooling system with an impeccable reputation for functionality throughout many generations of Toyota Highlander. It is located close to the radiator and is responsible for managing the engine temperature, so that the Toyota Highlander comfortably resides in the efficiency/safety sweet spot. The working principle of the Thermostat is to regulate the circulation of heat transfer fluids through on-off control of heating/cooling devices. This functionality is especially vital in sustaining the performance of the engine depending on the driving situations. Various kinds of Thermostat have been applied in Toyota Highlander, some of them include highly effective wax pellet Thermostat through the expansion and contraction effects of temperature to improve the vehicle's comfort and performance. There is the five-seater and the seven-seater Toyota Highlander, and one can get a model with front-wheel drive or all-wheel drive depending on his or her preference. The highlights of the vehicle the integration of the advanced Thermostat change in the functionality of the Highlander and enhances the safety of the vehicle by ensuring it does not overheat. In addition to providing vehicles with a comfortable cabin and numerous options, Toyota's skillful engineering delivered a reliable and long-lasting part like the Thermostat that will keep the Highlander running for many years. In summary, the Thermostat plays a critical role of ensuring maximum performance of the car, efficiency and above all safety of the vehicle.

If you are in demand for superior quality and affordable OEM Toyota Highlander Thermostat, then shop with us! We own a wide range of the reduced-priced genuine Toyota Highlander Thermostat. You can purchase in confidence as all parts come with a manufacturer's warranty. Any issues with our products? No need to worry as we have a hassle-free return policy to guide you every step of the way.

Toyota Highlander Thermostat Parts Questions & Experts Answers

Thermostat
90916-03136
Q: How to check and replace a thermostat in a cooling system on Toyota Highlander?
A:
Unless you want to think that the cooling system problem is a fault of the thermostat, try to inspect the coolant level, the tension of the drive-belt, and the function of the temperature gauge. If the engine takes a long time to warm up, the thermostat is most probably stuck open and should therefore be replaced. If the engine is hot and the lower radiator hose is cool, the thermostat may be stuck shut and not allowing the coolant to go into the radiator; thermostats should therefore be replaced. If the lower radiator hose is hot, then coolant is circulating thus the thermostat is open. It is important to eliminate the thermostat; that is, if the socket is open at room temperature, the thermostat is bad. To test it, put the closed thermostat on boiling water with a thermometer in it with no portion of the thermometer in contact with the sides of the container and heat the water while observing the changes in the thermostat. Pay attention to the degree of opening at which the air curtain starts expelling air and when it is fully operative; this has to be checked against the standard temperature. This should be replaced if it does not perform as it is expected to do so in the course of using the equipment. To replace, remove the negative battery terminal, lift the car properly, take out the lower part of the engine and the fender splash shield, drop the Coolant and remove the Radiator hose connecting to the thermostat housing. Take off the drive belt, and, in the case of Lexus RX330, starter. For four-cylinder models, unbolt the alternator, disconnect the radiator hose from the thermostat housing, and remove the housing The thermostat should also be removed and sealing surfaces cleaned. Replace a gasket and the thermostat that is equipped with the jiggle valve in the upper position. For the V6 versions, take off the air filter, then unscrew the water inlet pipe, and uncouple the radiator hose. Take out the thermostat housing and put a new gasket and correctly position the jiggle valve. On 2GR-FKS engines, the wiper motor and linkage, the air filter housing and the battery tray if required should be removed. The thermostat housing assembly should be gotten rid of with its electrical connector and bypass and radiator hoses thrown in; it should then be put in as a single assembly. Inspect for squeaks, vibration, and component alignment, then tighten the housing fasteners to the torque out of the use and fill with the coolants, start the engine, and confirm its normal operation and leakage.