Cooling system tools and supplies we recommend alongside our repair guides—for common DIY top-offs, diagnosis, and maintenance.
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Start with the right coolant for your vehicle, a correctly rated radiator cap, and simple tools that help you spot overheating early. Always match coolant type and cap pressure to your owner's manual and never open a hot cooling system.
12 Products

EPAuto Spill-Proof Coolant Funnel Kit
No-spill radiator fill kit with adapters to reduce mess and trapped air when topping off or refilling coolant. Wait until the engine is fully cool before opening the system.
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Etekcity Infrared Thermometer (Temp Gun)
Non-contact temp gun for checking radiator, hose, and thermostat area temps when diagnosing overheating.
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Lisle 24680 Spill-Free Coolant Funnel Kit
Shop-style no-spill fill kit with extra adapters for GM and Ford surge tanks. Reduces mess and trapped air when topping off or refilling coolant. Wait until the engine is fully cool before opening the system.
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Lisle 75500 Combustion Leak Detector
Block tester that checks for exhaust gases in the coolant when a head gasket leak is suspected. Fluid turns yellow if combustion gases are present. Not a substitute for a shop diagnosis.
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MotoRad ST13 13 PSI Safety Lever Radiator Cap
OEM-style 13 PSI cap with a pressure-release lever. Confirm PSI rating and neck fitment for your vehicle before buying. A wrong cap can cause overflow or overheating.
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MotoRad ST16 16 PSI Safety Lever Radiator Cap
OEM-style 16 PSI cap with a pressure-release lever. Confirm PSI rating and neck fitment for your vehicle before buying. A wrong cap can cause overflow or overheating.
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Orion Motor Tech 19-Piece Coolant Pressure Tester Kit
Hand-pump kit with adapters to pressure-test the cooling system and find leaks at the radiator, hoses, cap, or water pump. Match the adapter to your filler neck and do not exceed the vehicle’s rated PSI.
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Prestone AS105 Radiator Flush & Cleaner (22 oz)
Cleans rust, scale, and residue from the radiator, heater core, and hoses before a coolant refill. Follow the bottle directions and wait until the engine is fully cool.
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Prestone Dex-Cool 50/50 Coolant (1 Gallon)
Orange Dex-Cool formula for many GM vehicles (1995+) and other cars that specify Dex-Cool. Use only if your owner’s manual calls for Dex-Cool/orange coolant.
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Prestone MAX Asian Green Coolant (50/50)
Formulated for many Asian vehicles (Honda, Toyota, Hyundai, and similar). Use only if your owner’s manual calls for Asian/green coolant.
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Valvoline Multi-Vehicle 50/50 Coolant (1 Gallon)
Ready-to-use 50/50 antifreeze/coolant for top-offs and flushes. Check your owner’s manual for the correct coolant type before pouring.
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Zerex G-05 50/50 Coolant (1 Gallon)
Yellow HOAT formula specified by many Ford, Chrysler, and Mercedes-Benz vehicles. Use only if your owner’s manual calls for G-05 or equivalent HOAT coolant.
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