Prestone Coolant/Antifreeze Tester is a handy tool that allows you to check the protection level of your car’s coolant/antifreeze. Quick and easy to use, the tool lets you test how well your engine is protected against extreme temperatures – helping you avoid costly repairs and unexpected breakdowns out on the road.

Many of us just leave coolant/antifreeze checks to the garage, but it’s easy to test and top up yourself at home and can save you time and money. The Prestone Coolant/Antifreeze Tester is the perfect tool for those hoping to maintain their car’s cooling system themselves, with an easy-to-read dial that makes testing your car’s summer and winter protection effortless.

  • Guaranteed to work with any vehicle
  • Tests winter protection down to -37ºC, and summer protection up to 129ºC
  • Easy to use at home
  • If you find that your engine isn’t fully protected, you can top up easily with Prestone Ready to Use Coolant/Antifreeze, which is guaranteed to mix with any colour coolant and can be used in any car

Features and Benefits

Your car needs coolant/antifreeze to keep the engine at the correct temperature. Without it, your engine could overheat or freeze, causing expensive damage.

Despite the potential for costly repair bills and catastrophic breakdowns, few people check and maintain their car’s cooling system on a regular basis. But doing so is much simpler than you might think, and the Prestone Coolant/Antifreeze Tester makes it even easier still.

Guaranteed for use with all vehicles and all coolant types, the Prestone Coolant/Antifreeze Tester makes it quick and easy to check whether your car is protected any time. It tests your winter protection down to -37ºC, and your summer protection up to 129ºC to ensure you’re prepared for extremes.

Designed to be used in the coolant/antifreeze reservoir, the tool has an easy-to-use pipette design that allows you to take a sample of coolant for testing. It then grades the protection level of the coolant on an easy-to-read scale, so you can quickly establish how well your engine is protected from high and low temperatures.

How it Works

Using the Prestone Coolant/Antifreeze Tester couldn’t be simpler. When the engine is cool, remove the cap from the coolant/antifreeze expansion tank and dip the hose on the tester into the reservoir. Squeeze the end of the pipette to take a sample of coolant, before reading the protection level on the side of the device.

Our coolant/antifreeze tester is designed for checking both freezing and summer temperature protection, so you can see its max. and min. protection ratings. If the readings are poor, we’d recommend replacing the coolant/antifreeze as quickly as possible to maintain efficient engine cooling.

What’s more, thanks to the tool’s translucent plastic design, it also allows you to perform a visual check of the condition of the coolant/antifreeze. If it appears dirty, milky, or cloudy, or has obvious particles floating in it, flush the system soon to maintain maximum engine protection.

What people say…

“The antifreeze tester is a very useful addition to any toolbox, I use mine on an almost daily basis for my work in a busy main dealer.”Mike Rogers

“Great little tool to have, very well made. Easy to use and read. Let’s you see the level of protection for freezing conditions as well as the boiling point for hot summers.” – Marcus Stirling

“Really simple to use and read. It made checking my winter protection an absolute piece of cake and put my mind at ease that I was properly protected. I also used it on my father’s car and found that he required a coolant change, so this brilliant freebie has potentially saved my elderly father’s transport issues during the winter. Thank you Prestone.” –  Tom Rafal

Where to Buy

If you’re ready to take control of maintaining your car’s cooling system, the Prestone Coolant/Antifreeze Tester is an indispensable tool to have in your garage. The product is available to buy from motoring stores and select retailers, or online. Click the link below to find your nearest stockist.

Frequently asked questions:


You pour coolant straight into the cooling system, through the white tank.

Find out more

Yes. Prestone is guaranteed to be compatible with all makes and models of cars, and all other coolants. It's the only coolant/antifreeze which can be mixed with any other coolant without causing any damage. This makes it easier for you to choose and use - just pick Prestone and you know you have a high performance coolant which will work in your car.

Find out more

You should check your level of coolant regularly and top up as necessary. Check your vehicle's handbook for more information on this. If you find you have to top up the coolant every day or every week, you might have a leak and should have it checked by a trained professional mechanic just to be on the safe side.

Find out more

Prestone Ready to Use Coolant is the most convenient way to top up your cooling system. Prestone's unique formula mixes with any coolant or antifreeze and can be used in any make or model of passenger vehicle. Make sure that whichever Prestone product you choose, you follow the instructions on pack.

Find out more

You might also like: