Genuine Mazda Protege Radiator Cap

Cooling Radiator Cap

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6 Radiator Caps found

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Mazda Protege Cap Part Number: KL01-15-205
$17.43 MSRP: $23.24
You Save: $5.81 (25%)
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Product Specifications
- Other Name: Cap, Radiator Sub Tank; Cap, Reservoir Cap
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 1999-2003 Mazda Protege | DX, ES, LX, Mazdaspeed, MP3 | 4 Cyl 1.6 L GAS, 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
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Mazda Protege Cap Part Number: D316-15-205
$28.48 MSRP: $37.98
You Save: $9.50 (26%)
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Product Specifications
- Other Name: Cap, Radiator; Cap, Reservoir Cap
- Replaces: D316-15-205-PT, N350-15-205
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 1990-1998 Mazda Protege | 4WD, Base, DX, ES, LX, SE | 4 Cyl 1.5 L GAS, 4 Cyl 1.8 L GAS
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Mazda Protege Radiator Cap Part Number: WL21-15-205
$19.16 MSRP: $25.56
You Save: $6.40 (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:
- 1999-2003 Mazda Protege | DX, ES, LX, Mazdaspeed, MP3 | 4 Cyl 1.6 L GAS, 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
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Mazda Protege Radiator Cap Part Number: B3C7-15-205
$21.76 MSRP: $28.56
You Save: $6.80 (24%)
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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:
- 1995-1998 Mazda Protege | DX, ES, LX | 4 Cyl 1.5 L GAS, 4 Cyl 1.8 L GAS
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Mazda Protege Cap Part Number: B6S7-15-355A
$3.21 MSRP: $4.22
You Save: $1.01 (24%)
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Product Specifications
- Other Name: Cap, Tank; Cap
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 1990-1994 Mazda Protege | 4WD, Base, DX, LX, SE | 4 Cyl 1.8 L GAS
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Mazda Protege Cap Part Number: F8B7-15-205
Product Specifications
- Other Name: Cap, Radiator; Cap
- Warranty: This genuine part is guaranteed by Mazda's factory warranty.
Fits the following Vehicles:
- 1990-1991 Mazda Protege | 4WD, DX, LX, SE | 4 Cyl 1.8 L GAS

Mazda Protege Radiator Cap

The Mazda Protege Radiator Cap is applied to maintain the temperature of the engine by keeping the exact pressure within the cooling loop. Put to the test over day-to-day journeys and on extended highway pulls, the cap has gained a reputation for being reliably steady, and thus is relied upon by drivers when the road congests or the summer sun blazes. The spring-loaded valve maintains approximately 16 PSI, which increases the boiling point of the coolant, prevents vapor pockets, and preserves horsepower that would be wasted on heat soak. During periods of pressure spikes, the Radiator Cap directs surplus fluid to the overflow tank and subsequently withdraws it later under vacuum, thus maintaining the system topped off without the need to refill it messily. Such a back and forth rhythm safeguards hoses, heater cores, and gaskets, prolonging the life of components and enhancing their general effectiveness. It may be installed with the 1.8-liter SOHC of the early nineties Protege sedan or the 170 hp turbocharged performance edition that was issued in 2003, but the cap fits well due to similar factory specifications. The early metal variations have traditional durability, with the later variations having a larger plastic grip that protects knuckles and uses a thicker gasket to create an even tighter seal at higher revolutions, a change that Mazda testing led to. It is also important not to change the correct 16 PSI rating, since a lower rating risks boil-over and a higher one will stress the cooling equipment, so this little component is an immediate passenger safety measure. Owners love the fact that it can be installed within a few seconds, but the benefit is gained every mile as the stable temperatures translate into easier fuel burning and increased comfort in the cabin. The Mazda cap with durable materials, intelligent pressure control, and compatibility with other generations makes it a standout among the multitude of caps in the market as an easy addition to use that pays in the form of peace of mind. This Radiator Cap is a bit of essential protection for every Protege on the road, but one that is guaranteed by the trusted Mazda engineering ethos as well as by accurate machining.

Looking for Radiator Cap with proven quality? Choose OEM Radiator Cap. Mazda designs and builds them to strict factory specs. Every piece goes through rigorous quality checks. You'll get parts that fit right and work like new. Shop our huge inventory of OEM Mazda Protege parts. Enjoy the highly competitive prices online. Our site is your one-stop shop. Each genuine Protege part includes a manufacturer's warranty. Buy with confidence. Our return policy is simple and hassle-free. In a rush? Choose expedited delivery at checkout. You'll love the streamlined experience from search to checkout to receiving your order.