What steps should be taken before assuming the thermostat is responsible for a cooling system problem on 2007 Mazda MX-5 Miata?

Filled coolant level, gauge before suspecting the thermostat. When the engine warms slowly it is probably well and truly stuck open; when hot and the upper radiator hose is half-frozen, it is probably stuck closed. In the absence of a thermostat, emissions and fuel economy damage. Disassemble, drain, change thermostat, reassemble, fill up and leak check.

Genuine 2007 Mazda MX-5 Miata Thermostat

Engine Coolant Thermostat

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2007 Mazda MX-5 Miata Thermostat Part Number: L336-15-170
$42.59 MSRP: $56.79
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Product Specifications
- Other Name: Thermostat & Cover; Cover, Thermostat, Thermostat Housing, Water Inlet
- Replaces: L328-15-170A, L327-15-170, L327-15-170A, L327-15-171, L328-15-170B, ZZCA-15-172, ZZCA-15-172A, LFE2-15-170
- Item Weight: 1.20 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: L336-15-170
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
More Info
Fits the following 2007 Mazda MX-5 Miata Submodels:
- Base, Club Spec, Grand Touring, Sport, SV, Touring | 4 Cyl 2.0 L GAS

2007 Mazda MX-5 Miata Thermostat Parts and Q&A

Q: What steps should be taken before assuming the thermostat is responsible for a cooling system problem on 2007 Mazda MX-5 Miata?
A: Filled coolant level, gauge before suspecting the thermostat. When the engine warms slowly it is probably well and truly stuck open; when hot and the upper radiator hose is half-frozen, it is probably stuck closed. In the absence of a thermostat, emissions and fuel economy damage. Disassemble, drain, change thermostat, reassemble, fill up and leak check.