Is it dangerous to open the radiator cap when the engine is hot?

Yes, extremely — a pressurised, hot cooling system can spray scalding coolant when opened, causing severe burns. Always let the engine cool completely before opening.

How do I know if the cap is faulty?

A pressure tester at a garage can confirm whether the cap holds its rated pressure — a common and cheap thing to test when diagnosing unexplained coolant loss.

What is the cap made of?

Plastic or metal with a rubber sealing gasket and a spring-loaded pressure-relief valve.

What is this part and what does it do?

Full description available in the product description section above. Contact us with clarifying questions.

How do I tell if my part is faulty?

See the 'Signs of a faulty part' section above or run a diagnostic at an auto service.

Yes - all our used parts are tested before sale and sold with guaranteed quality.

When should the part be replaced?

When warning signals appear, diagnostic codes are present, or the system malfunctions.

Radiator cover MAZDA 6 2007

Name: Radiator cover MAZDA 6 2007
Brand: MAZDA
SKU: GS1D50665 RH
Price: 9.00 EUR
Availability: InStock

OEM: GS1D50665 RH

Disassembled car photo

Engine running

Tested before shipping
Guaranteed quality
Fast delivery 3–7 days
14-day returns

What is this part and why does it matter?

The radiator cap seals the top of the radiator (or coolant reservoir on some systems) and maintains correct system pressure, which raises the boiling point of coolant.

Ask a question

Not sure about compatibility? Send us your car's VIN and we'll confirm.

Ask about this product

Signs of a faulty part

If you notice any of the following, the part likely needs replacement:

Coolant loss with no visible external leak
Overheating from insufficient system pressure
Coolant bubbling or spraying out when the cap is opened (when hot — never open when hot)

Installation information

Screws or clips onto the radiator or reservoir neck — always check the sealing gasket is intact before fitting.

Donor vehicle description

VIN: JMZGH128201195323
Make, model: MAZDA 6
Year: 2007
Engine: 1.8 Benzīns 88KW MZR
Transmission: 5-pārnesumu mehāniska kārba ECE, W/DSC
Drive: Prikšēja
Colour: 32V COPPER RED MICA

224 parts from this car

Frequently asked questions

The cap maintains system pressure, which raises coolant’s boiling point above 100°C — a cap that can’t hold this pressure lets coolant boil at a lower temperature, reducing cooling efficiency.

What our customers say

All reviews →

Price: affordable. Service: electrical equipment repair.
A
Andris B.
September 2026
Price: excellent.
D
Didier V.
August 2026
Super good! They came through with the part I needed, quickly and at a fair price! Thanks, and I definitely recommend!
I
Ilmars K.
August 2026
I ordered a Heater Blower Motor Resistor for a Toyota Avensis. Delivery took eight days from Latvia to Ireland. I installed it, and everything works perfectly. I wish this company success.
A
Aleksandr L.
Toyota Avensis
August 2026
No complaints about Evro Trans itself, everything's fine. But the delivery..... It felt like the order was being carried by turtles. 4 days from Riga to Daugavpils. Judging by the tracking, the parcel just sat somewhere behind a shed for 3 days, then they found it and delivered it the next day. I think that's why I won't be ordering there again.
P
Paul F.
June 2026
Super fast delivery of the part, and good quality of the used part. Thanks for the service.
N
Natālija I.
May 2026
I ordered antifreeze heaters and an auxiliary pump. Everything arrived quickly, the very next day, and matched the description. I'm satisfied.
J
Juris J.
February 2026
Excellent service, timely delivery, and complete transparency at every step. I highly recommend EvroTrans to anyone looking for a reliable partner!
E
Egor S.
November 2025
Bought a front fender for my car. I liked it! After payment they sent more than 20 photos of the problem areas, and it was packed very securely - took a while to unwrap.
I
Igors K.
Front fender
October 2025