How to service the thermostat on Toyota MR2 Spyder?

Maintenance includes service of the thermostat, drainage of the coolant, and replacement of the drive belt, generator and disconnection of the water inlet. Test the thermostat in hot water; change it when it fails to open at 80-84°C or when it fails to satisfy valve lift requirements. Install a new gasket, making sure it fits correctly, rinoculate coolant and seal leaks.

OEM Toyota MR2 Spyder Thermostat

Engine Coolant Thermostat

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Toyota MR2 Spyder Water Inlet
Part Number: 90916-A3003
$22.69 MSRP: $31.59
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Product Specifications
- Other Name: Thermostat; Engine Coolant Thermostat; Thermostat, Coolant
- Replaces: 90916-03129, 90916-03084
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2000-2005 Toyota MR2 Spyder | Base | 4 Cyl 1.8 L GAS

Toyota MR2 Spyder Thermostat

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Toyota MR2 Spyder Thermostat Parts and Q&A

Water Inlet
90916-A3003
Q: How to service the thermostat on Toyota MR2 Spyder?
A: Maintenance includes service of the thermostat, drainage of the coolant, and replacement of the Drive Belt, generator and disconnection of the water inlet. Test the thermostat in hot water; change it when it fails to open at 80-84°C or when it fails to satisfy valve lift requirements. Install a new gasket, making sure it fits correctly, rinoculate coolant and seal leaks.