Genuine Mazda 6 Radiator Cap

Cooling Radiator Cap

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7 Radiator Caps found

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Mazda 6 Radiator Cap Part Number: L321-15-205
$7.79 MSRP: $10.39
You Save: $2.60 (26%)
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Product Specifications
- Other Name: Cap, Radiator
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2003-2008 Mazda 6 | i, Mazdaspeed, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda 6 Radiator Cap Part Number: LF21-15-205
$22.35 MSRP: $29.81
You Save: $7.46 (26%)
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Product Specifications
- Other Name: Cap, Radiator
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2006-2007 Mazda 6 | i, Mazdaspeed, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda 6 Radiator Cap Part Number: PE01-15-205
$25.84 MSRP: $34.45
You Save: $8.61 (25%)
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Product Specifications
- Other Name: Cap, Radiator
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2014-2017 Mazda 6 | Grand Touring, Sport, Touring | 4 Cyl 2.5 L GAS
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Mazda 6 Radiator Cap Part Number: PX35-15-205B
$25.70 MSRP: $34.27
You Save: $8.57 (26%)
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Product Specifications
- Other Name: Cap, Radiator; Filler Cap, Radiator Cap, Reservoir Cap
- Replaces: PX35-15-205, PX35-15-205A
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2019-2021 Mazda 6 | Carbon Edition, Grand Touring, Grand Touring Reserve, Signature | 4 Cyl 2.5 L GAS
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Mazda 6 Radiator Cap Part Number: PE11-15-205
$31.35 MSRP: $41.81
You Save: $10.46 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cap, Radiator; Filler Cap
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2014-2021 Mazda 6 | Grand Touring, Grand Touring Reserve, Signature, Sport, Touring | 4 Cyl 2.5 L GAS
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Mazda 6 Radiator Cap Part Number: L3R1-15-205
$4.73 MSRP: $6.31
You Save: $1.58 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cap, Radiator
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2007-2008 Mazda 6 | i | 4 Cyl 2.3 L GAS
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Mazda 6 Radiator Cap Part Number: L3R4-15-205
Product Specifications
- Other Name: Cap, Radiator
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 2011-2013 Mazda 6 | i | 4 Cyl 2.5 L GAS

Mazda 6 Radiator Cap

Mazda 6 Radiator Cap maintains coolant at the optimal pressure to ensure that the engine operates more easily, smoothly, and for a longer duration when applied in normal everyday commute or in a spirited highway run. Constructed with a robust metal casing and an adjustable set of springs rated at approximately 16 PSI, this miniature valve allows the liquid to remain stagnant even at the hot weather, and then discharges any surplus fluid to the overflow container before pressure could cause hoses and gasket failure, which safeguards performance and the occupants. Its time-tested twin-valve concept has not been changed since the original Mazda 6 was assembled in 2002, and the subsequent generation 6 still enjoys it, i.e., the same part number philosophy can be applied to older sedans, sporty Mazdaspeed 6 versions, and the recent flagship, with its new turbocharged engine with just as much confidence. The Radiator Cap creates a loop through which the coolant is also recirculated as the system cools and therefore prevents air pockets, which might cause corrosion of passages or deprive the cabin heater of its warmth, something many drivers do not think about until they experience the consequences of air pockets. The owners of Mazda are pleased to know that this reliable part does not need intricate installation, just twist on, test, and rely owing to the stable adherence of the brand to simple engineering. This Radiator Cap has the advantage of actively increasing the boiling point over regular plugs that simply seal the filler neck, thus increasing thermal efficiency, which can translate into more consistent fuel economy or a reduced number of heat soak problems on long ascents or in gridlock. All Mazda cooling circuits were laid out along their exact pressure rating, which again supports the reason why replacing a tired seal at the right time is such a clever tool of low-cost investment in engine life and family road trip tranquility.

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