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Subaru Radiator Cap Assembly - STi Crosstrek Forester Impreza Legacy Outback WRX 45137AE003 - Genuine OEM

Subaru Radiator Cap Assembly - STi Crosstrek Forester Impreza Legacy Outback WRX 45137AE003 - Genuine OEM

$16.99 USD
$16.99 USD
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✔ Subaru 45137AE003 Radiator Cap Assembly — Genuine OEM
✔ Fitment: Subaru STi, Crosstrek, Forester, Impreza, Legacy, Outback, WRX, and other select models
✔ Direct replacement for factory radiator cap assembly — no modifications required
✔ Manufactured to Subaru's original specifications and tolerances
✔ Complete assembly — cap, pressure valve, and rubber gasket ready to install
✔ Correct pressure rating — maintains optimal cooling system pressure

 

Subaru 45137AE003 Genuine Radiator Cap Assembly — for STi, Crosstrek, Forester, Impreza, Legacy, Outback, WRX

Coolant leaks from the radiator neck, engine overheating at idle or under load, a low coolant level warning, or steam coming from under the hood — these are common signs that your radiator cap is failing. A worn or stuck cap can cause coolant loss, pressure loss, and overheating, which can lead to severe engine damage. Replacing it with this genuine Subaru radiator cap assembly restores proper cooling system pressure and protects your engine.

This is a factory‑original Subaru radiator cap assembly (OE part number 45137AE003), designed for a wide range of Subaru models. It features a calibrated pressure relief valve and a rubber sealing gasket to maintain the correct operating pressure in the cooling system, preventing coolant boiling and reducing the risk of hose and radiator damage. This is the same part sold at Subaru dealerships.

 

When to Replace


When to Replace (Common Symptoms)
• Coolant leaks from the radiator neck or cap area
• Engine overheating at idle or under load
• Low coolant level warning or coolant loss
• Steam or coolant spray from under the hood
• The cap does not hold pressure (can be tested with a pressure tester)
• Damaged or cracked rubber gasket on the cap
• Visible corrosion on the cap or radiator neck

Product Details & Highlights


Product Highlights
• ✔ Genuine Subaru OEM — not an aftermarket or Chinese replica
• ✔ Complete assembly — cap, pressure valve, and gasket included
• ✔ Calibrated pressure relief valve — opens at the correct pressure
• ✔ High‑temperature rubber gasket — ensures a leak‑free seal
• ✔ Made from corrosion‑resistant materials — for long service life
• ✔ Backed by Subaru’s manufacturer warranty (valid through any authorized dealer)

Package Contents


Package Contents
• 1 × Subaru 45137AE003 radiator cap assembly (genuine)

FAQ

FAQ

Is this a genuine Subaru part or a copy?
This is 100% genuine Subaru OEM — in original factory packaging with Subaru part number printed on the label. It is not an aftermarket brand or a replica.

Does this fit my 2015 Subaru WRX?
Yes — the 2015 WRX uses this radiator cap assembly. We recommend verifying with your VIN.

Does this fit my 2018 Subaru Crosstrek?
Yes — the 2018 Crosstrek uses this cap assembly. Please verify with your VIN.

Does this fit my 2010 Subaru Forester?
Yes — the 2010 Forester uses this cap. Please verify with your VIN.

Can I reuse the old cap?
If the cap is in good condition and holds pressure, it can be reused. However, we recommend replacing it if the gasket is damaged or the cap no longer holds pressure.

Does this cap come with a new gasket?
Yes — the gasket is pre‑installed on the cap assembly. No separate gasket is required.

What is the torque spec for installation?
The cap should be tightened by hand until it seats. Do not overtighten — this can damage the cap or the radiator neck.

Will this cap fit the Subaru Outback?
Yes — the Outback uses this radiator cap assembly. Please verify with your VIN.

Is this the same cap used on the Subaru STi?
Yes — the STi uses the same cap assembly. Please verify with your VIN.

Does this cap fit the 2020 Subaru Legacy?
Yes — the 2020 Legacy uses this cap. Please verify with your VIN.

How do I test the radiator cap?
You can test the cap with a pressure tester. It should hold the specified pressure for the Subaru cooling system.

What is the pressure rating of this cap?
The pressure rating is specific to Subaru cooling systems. It is designed to maintain the correct operating pressure for these models.

Can I use this cap on other brands?
No — this cap is specifically designed for Subaru cooling systems. It may not fit other brands or models.

Does this cap come with a replacement warranty?
Yes — this cap is backed by Subaru's manufacturer warranty. For claims, please contact your nearest Subaru authorized dealer.

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