DAYUAN Radiator Pressure Tester Kit 28pc — Universal 0–35 PSI with Vacuum Purge & Cap Adapters

DAYUAN's 28-piece universal radiator pressure tester kit combines pressure and vacuum testing plus coolant purge/refill tools to locate leaks and service most passenger vehicle cooling systems.

This comprehensive kit contains adapters, a hand pump, radiator cap testers and vacuum purge tools to diagnose cooling system faults and replace coolant without spills. The set is engineered to fit a wide range of makes and models, with color-coded caps and a 0–35 psi test range for straightforward pressure checks. Everything is organized to save time when isolating leaks, testing caps, and performing a controlled coolant change.

How do I use this kit to find a radiator leak?

Attach the correct adapter for your radiator or coolant reservoir, then use the hand pump to pressurize the system while watching the gauge for pressure loss. If pressure drops, inspect hoses, seams, and connections for visible coolant or bubbles; the kit allows safe, controlled pressurization without running the engine. This method identifies leaks at caps, hoses, radiator cores, and heater connections quickly.

• Select the color-coded radiator cap adapter that matches your vehicle.
• Hook up the hand pressure pump and tighten with the included spanner.
• Pump to a safe pressure (under 35 psi) and observe gauge readings for drops.
• Visually and tactilely inspect suspect areas while under pressure.

Can this kit test radiator caps and cooling system seals?

Yes — the kit includes dedicated radiator cap test adapters and a universal radiator adapter to verify cap sealing performance and system integrity. By pressurizing the system with the appropriate cap adapter installed, you can confirm whether a cap is holding pressure or allowing leakage that could cause overheating or coolant loss. This helps rule out cap failure before replacing other components.

• Two radiator cap test adapters for common cap sizes and types.
• Universal adapter options for nonstandard necks and reservoirs.
• Hand pump and gauge for controlled, repeatable testing.
• Adapter spanner to ensure leak-free connections during tests.

How does the vacuum purge and refill feature save time and mess?

The vacuum purge and refill tools let you remove old coolant and refill the system without airlocks or spills, speeding coolant changes and improving coolant circulation after service. Using vacuum to draw out fluid reduces the need to lift the vehicle or disconnect multiple hoses, and it minimizes exposure to hot coolant. The kit’s fittings adapt to many reservoir and radiator necks for a tidy service process.

• Two vacuum purge and refill adapters for various neck sizes.
• Vacuum draws coolant out cleanly, reducing spills and mess.
• Refill under vacuum to prevent air pockets and speed bleeding.
• Clear connections make it easy to see fluid flow during service.

What vehicles and applications are compatible with this set?

The DAYUAN kit is built to work with a broad range of passenger cars and light trucks, including many European, Asian, and American brands. Included adapters and the 0–35 psi test range cover most factory radiator openings and cap pressures. While it supports common makes like Mercedes-Benz, BMW, Audi, Toyota and Ford, always confirm adapter fit for uncommon or specialty necks before use.

• Compatible with Mercedes-Benz, Audi, BMW, VW, Toyota, Ford and more.
• Includes 17 radiator adapters plus three chromed steel fittings for durability.
• Color-coded caps simplify matching to your vehicle’s radiator neck.
• Universal parts and spanner enable use across many service tasks.

Who is this for: This DAYUAN 28-piece kit is aimed at DIY mechanics, home enthusiasts, and independent technicians who need a single, portable solution to diagnose cooling system leaks and perform coolant changes without a shop. It suits anyone who wants to troubleshoot radiator caps, hoses, and seals quickly, perform controlled coolant purges and refills, and reduce downtime during routine maintenance or repair work.