Radiator & Expansion Tanks and Caps

Your cooling system is only as strong as its seals and that’s where radiator and expansion caps come into play. At Tinkr, our collection of radiator caps, expansion tank caps, and related components is built to deliver reliable pressure control and long-lasting protection. Whether you're replacing a faulty cap or upgrading for peace of mind, our premium selection helps prevent leaks, overheating, and system failure.

These small but mighty components are critical for maintaining optimal coolant pressure and temperature. A well-functioning cap ensures your radiator and expansion tank perform at their best, keeping your engine cool even during tough New Zealand drives. From everyday commuters to off-road warriors, we’ve got the right parts for all vehicles.

We stock trusted brands and quality-tested parts that meet or exceed OEM specs so you know you're getting durability you can count on. Every cap and tank in this collection is selected for fit, reliability, and real-world performance.

Stay cool and carry on with Tinkr’s Radiator & Expansion Tanks and Caps collection. Fast NZ-wide shipping and great prices make it easy to get your cooling system sealed, secure, and road-ready.

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FAQs

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What payment methods can I use?

We can take payment from most major credit cards - like Visa and Mastercard. We can also offer AfterPay and manual bank transfer.

Are the autoparts on your website genuine?

They certainly are! We only partner with leading global manufacturers and suppliers to ensure our customers get the best product AND price.

Do you offer warranties on your autoparts?

We do offer warranties on most parts! Refer to the individual part information or speak to a member of our team to learn more.

Tinkr Reviews

  • Thank you - so quick in delivery with my order. I was expecting at least another 3-4 days to arrive. Great website easy to order with the illustrations, saving a lot of guess work when choosing your items. Well done!
    testimonial author avatar
    William
  • We got the part shipped within a day all the way down to the West Coast! I accidentally ordered the wrong article and they helped me out and replaced it straight away. You guys are awesome!
    testimonial author avatar
    Anna
  • Chuck & Greg from Tinkr were very helpful finding the correct auto transmission filter kit for us, fast & efficient, overnight delivery at a very reasonable price $127, both Repco & Supercheap quoted $439. This is first time we have dealt with Tinkr Limited and we would not hesitate to purchase from them again. Thanks for the fantastic service!
    testimonial author avatar
    Del

TINKR is your most comprehensive New Zealand owned auto parts store. With over 150,000 car parts, accessories & tools, to suit a huge range of passenger cars, 4x4s and commercial vehicles. Whether you're after a cambelt, a fan belt, or a seat belt, for a Toyota Corolla, a Mitsubishi Lancer, or a trusty Mazda Familia - TINKR has it covered.

So long as you know what parts you need, the job's tidy. Simply enter your vehicle's 'Rego' and press search. We'll display the parts that fit that particular vehicle. If the parts you need aren't displaying, no drama. Send us a 'Parts Request' and we'll do our best to supply them.