How to test and replace a thermostat in a cooling system on Toyota Yaris?

The thermostat in a cooling system can become slow to react or stick in the open or closed position as it ages. This can cause issues like slow warm-up or rapid overheating. Before assuming the thermostat is the problem, check the coolant level and ensure there are no airlocks. If the engine takes a long time to warm up or the temperature gauge is inaccurate, the thermostat may be stuck open or missing. If the engine runs hot and the radiator top hose is not hot, the thermostat is likely stuck closed and needs replacing. To test the thermostat, start the engine and monitor the temperature of the radiator top hose. If it remains cold and then quickly warms up, the thermostat is working. If not, remove and test the thermostat by heating it in water. If it fails or sticks, replace it. Use a new O-ring and tighten the cover nut/bolt to the specified torque when refitting. Refill the cooling system.

Genuine Toyota Yaris Thermostat

Engine Coolant Thermostat

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Toyota Yaris Thermostat
Part Number: 90916-03093
$22.48 MSRP: $31.42
You Save: $8.94 (29%)
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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:
- 2006-2018 Toyota Yaris | RS, STD | 4 Cyl 1.5L | 1NZFE; 1NZFE; NCP131L-AGMRKA, NCP131L-AGMRKK, NCP131L-AGMVKK, NCP131L-AGPRKA, NCP131L-AGPRKK, NCP131L-AGPVKK, NCP131L-AHMRKA, NCP131L-AHMRKK, NCP131L-AHMVKK, NCP131L-AHPRKA, NCP131L-AHPRKK, NCP131L-AHPVKK, NCP131L-CGMRKA, NCP131L-CGMRKK, NCP131L-CGMSKK, NCP131L-CGPRKA, NCP131L-CGPRKK, NCP131L-CGPSKK, NCP131L-CHMRKA, NCP131L-CHMRKK, NCP131L-CHMSKK, NCP131L-CHPRKA, NCP131L-CHPRKK, NCP131L-CHPSKK, NCP91L-AGMRKA, NCP91L-AGMRKK, NCP91L-AGMVKK, NCP91L-AGPRKA, NCP91L-AGPRKK, NCP91L-AGPVKK, NCP91L-AHMRKA, NCP91L-AHMRKK, NCP91L-AHMVKK, NCP91L-AHPRKA, NCP91L-AHPRKK, NCP91L-AHPVKK, NCP93L-BEMRKA, NCP93L-BEMRKK, NCP93L-BEPRKA, NCP93L-BEPRKK
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Toyota Yaris Thermostat
Part Number: 90118-WB459
$20.86 MSRP: $29.16
You Save: $8.30 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2019-2020 Toyota Yaris | Base, Entry, High | P5 | P5; P5; DADW-NAA, DADW-NAB, DADW-NAC, DAEA-NAA, DAEA-NAB, DAEA-NAC, DAEA-NAD, DAEA-NAE, DAEB-NAC, DAEC-NAC, DAEC-NAD, DAEC-NAE, DAEC-NAF, DAED-NAA, DAEE-NAA, DAEE-NAB, DDF4-NAA, DDF4-NAB, DDF4-NAC, DDF4-NAD, DDF5-NAA, DDF5-NAB, DDF5-NAC, DDF5-NAD, DDF5-NAE, DDF5-NAF, DDF5-NAG, DDF8-NAA, DDF9-NAA, DDF9-NAB, DM0S-NAA, DM0S-NAB, DM0S-NAC, DM0T-NAA, DM0T-NAB, DM0T-NAC, DM0T-NAD, DM0T-NAE, DM0V-NAA, DM0W-NAA, DM0W-NAB

Toyota Yaris Thermostat

The Toyota Yaris Thermostat is commonly positioned near the radiator; it is responsible for controlling, the functioning of the cars heat dissipation system. Its principal role is to act as a thermostat controlling the temperature of the engine. Thermostats are automatic controlling devices that indicate, and hold set temperature and directs the flow of heat transfer fluids. In automotive application, thermostats such as, bimetallic strip and wax pellet can effectively set the required operating temperature of the engine. These thermostats work on the principle of expansion and contraction with heat, thus providing accurate proportionate temperature control to increase the utility performance of Toyota Yaris cars.

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Toyota Yaris Thermostat Parts Questions & Experts Answers

Thermostat
90916-03093
Q: How to test and replace a thermostat in a cooling system on Toyota Yaris?
A: The thermostat in a cooling system can become slow to react or stick in the open or closed position as it ages. This can cause issues like slow warm-up or rapid overheating. Before assuming the thermostat is the problem, check the coolant level and ensure there are no airlocks. If the engine takes a long time to warm up or the temperature gauge is inaccurate, the thermostat may be stuck open or missing. If the engine runs hot and the Radiator top hose is not hot, the thermostat is likely stuck closed and needs replacing. To test the thermostat, start the engine and monitor the temperature of the radiator top hose. If it remains cold and then quickly warms up, the thermostat is working. If not, remove and test the thermostat by heating it in water. If it fails or sticks, replace it. Use a new O-ring and tighten the cover nut/bolt to the specified torque when refitting. Refill the cooling system.