Mazda Thermostats

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Keep Your Engine Running Right with Genuine Mazda Thermostats

Maintaining the right engine temperature is key to keeping your Mazda performing as it should. The thermostat plays a crucial role in regulating coolant flow and ensuring smooth temperature transitions during every drive. Over time, even quality thermostats can wear out, leading to performance issues and overheating. At Cox Mazda, we offer genuine Mazda thermostats built to last longer and perform better than generic aftermarket alternatives.

Understand What a Thermostat Does

The thermostat controls the flow of coolant between the engine and radiator to maintain a consistent operating temperature. When the engine is cold, it keeps the coolant in place until the motor warms up, then gradually opens to prevent overheating. Vehicles like the Mazda CX-30 and Mazda6 rely on this small but essential part to balance heat and performance efficiently. Using a genuine Mazda thermostat ensures that your vehicle’s cooling system functions exactly as intended by the manufacturer.

Know Why Thermostats Wear Out

After thousands of heating and cooling cycles, thermostats can become stuck open or closed, disrupting temperature control. Corrosion, coolant contamination, or old age are common causes of failure. Cheaper aftermarket thermostats may not fit precisely or respond accurately to temperature changes, increasing the risk of overheating or poor fuel economy. Genuine Mazda replacements from Cox Mazda are engineered for exact fit and reliable performance under all driving conditions.

Replace at the Right Time

Signs such as erratic temperature readings or poor heater performance often indicate a thermostat problem. Replacing it before complete failure helps prevent costly engine damage and keeps your Mazda running efficiently. When replacing your thermostat, consider inspecting the water pump as well, since both parts work closely to regulate engine temperature. At Cox Mazda, we provide high-quality Mazda parts designed for precision, durability, and long-term dependability.

Thermostat Housing

Part Number: FS05-15-172
Mazda Mazda
Other Names: Thermostat Cover, Cover Thermo
Description: 2.0L. 626, MX-6. Without turbo. All. 4 cyl.
$9.07

Thermostat Housing

Part Number: ZZM2-15-172
Mazda Mazda
Other Names: Engine Coolant Thermostat Housing, Cover Thermostat
Description: 4.0L, 1998-2000. B4000.
$38.09

Thermostat Housing

Part Number: B6BF-15-172
Mazda Mazda
Other Names: Water Outlet, Cover Thermostat
Description: Protege. 1.6l.
MSRP $37.81
$27.22

Thermostat Gasket

Part Number: ZZM0-15-173
Mazda Mazda
Other Names: Gasket Thermo Qty 1 5PCS
Description: B2300.
MSRP $5.72
$4.18

Thermostat Housing

Part Number: CWJ1-15-170
Mazda Mazda
Applications: 2.5L W/HYBRID.
Other Names: Engine Coolant Thermostat Kit, Inlet Sub Assembly Water W T
Description: 2.5L hybrid, reservoir & hoses. CX-50. Incl.Thermostat,Gasket & Housing.
MSRP $173.67
$120.85

Thermostat Cover

Part Number: PXPV-15-170
Mazda Mazda
Other Names: Cover Thermostat
Description: 2.5L non turbo, with i-stop, 2024-25.
MSRP $106.39
$74.03

Thermostat Housing

Part Number: AJ03-15-176A
Mazda Mazda
Other Names: Case Thermo
Replaces: aj0315176
Description: 3.0L.
MSRP $154.70
$107.65

Thermostat Set

Part Number: 8173-15-171
Mazda Mazda
Replaces: 8ax115171
MSRP $27.77
$19.99

Thermostat Housing O-Ring

Part Number: H301-15-173
Mazda Mazda
Notes: Included with thermostat housing.
Applications: 3.3L.
Other Names: Thermostat Gasket, Gasket Thermostat Cover
Description: 3.3L. CX-90. CX-70.
MSRP $11.48
$8.39

Thermostat Cover Bolt

Part Number: 9979-40-825
Mazda Mazda
Other Names: Trans Cooler Bolt, Alternator Mount Bolt, Thermostat Housing Bolt, Water Outlet Bolt, Idler Pulley Mount Bolt, Bolt Flange
Description: 6 cylinder. Auto trans.
MSRP $3.23
$2.37

Engine Coolant Thermostat

Part Number: PY8V-15-171
Mazda Mazda
Applications: 2.5L W/TURBO.
Other Names: Thermostat
Description: Mazda6. Mexico built. 2.5L. CX-50. Without i-stop. CX-90. Incl.Gasket. CX-70.
MSRP $33.81
$24.34

Thermostat Housing Gasket

Part Number: PX8E-15-169
Mazda Mazda
Notes: Included with thermostat housing.
Other Names: Engine Coolant Thermostat Housing Gasket, Gasket Water Outlet
Description: 2.5L. O-Ring.
MSRP $5.95
$4.36

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