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Vehicle Cooling Equipment

Cooling System

Radiator Testers

Hose Clamps & Tools

Thermo-Viscus Wrenches

FAQs

With the engine cold, remove the radiator cap (or expansion-tank cap on closed systems). Fit the appropriate adapter from the test kit to the cap location. Pump the tester to the system's specified working pressure (typically 1-1.4 bar / 15-20 PSI on standard automotive systems — check the cap or workshop manual for the rated pressure). Watch the gauge: if pressure holds steady for 10-15 minutes, the system is sealed; if pressure drops, there's a leak — inspect hoses, radiator core, water pump, and visible joints; for hidden leaks (head gasket, internal radiator), additional diagnostic steps are needed.

Match the test pressure to the system's rated working pressure — listed on the radiator cap (typically 13-20 PSI / 0.9-1.4 bar on standard automotive systems; up to 30 PSI / 2 bar on some commercial-vehicle and high-performance systems). Never exceed the cap's rated pressure during testing — over-pressurising can damage hoses, the radiator core, or expansion-tank seals. Always allow the engine to cool to ambient before connecting the tester.

Yes. Most radiator tester kits include a separate cap-tester adapter that fits the cap directly to the test pump — pressurise the cap up to its rated pressure and confirm the relief valve releases at the rated point. A cap that releases too early causes coolant loss and over-temperature; a cap that holds too long can over-pressurise the system. Cap testing is part of a complete cooling-system diagnostic and is recommended on any vehicle with cooling-system symptoms.

Most trade-grade tester kits include an adapter chart matching adapter numbers to common vehicle ranges. Identify by: the cap's outer diameter, the cap's locking style (push-and-twist standard, threaded, or specialist), and any marked-on cap pressure rating. The adapter set typically includes 8-15 adapters covering the majority of UK and European cars, light commercials, and HGV fitments. WhatsApp 07754288583 with the cap photograph if cross-reference is needed.

Every product is backed by our Fit Guarantee. If a part is incompatible with your machine, you can return it hassle-free. For damaged-on-arrival items, report within 24 hours with photographs to [email protected] — we will arrange collection. For other returns, email us first to obtain a Return Merchandise Number before sending. Returns are accepted within 30 days of purchase, in original packaging, on UK orders. A restocking fee may apply on returns where the buyer has changed their mind. Refunds are issued to the original payment method once the return is inspected.

Delivery time depends on the product, your destination, and availability — the estimated time for any item appears on the product page, and "Check where we deliver" confirms coverage for your postcode before you order. Next-day delivery is available on most products; the option appears at checkout when applicable. We deliver across the UK, Europe, the Middle East, and Africa. Use the country selector at checkout to confirm coverage and delivery options for your destination.

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Radiator Testers

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Within Vehicle Cooling Equipment, Radiator Testers covers the diagnostic tools used to pressure-test vehicle and plant cooling systems — checking for leaks in radiator cores, hoses, head gaskets, expansion tanks, and water-pump seals. A radiator pressure tester pressurises the cooling system to its working pressure, allowing the workshop to find and locate slow leaks that aren't visible during normal running.

Parts for Machines supplies radiator testers across the trade and professional ranges, covering test kits sized for cars, light commercials, HGVs, agricultural tractors, and plant equipment with both standard and pressurised cooling systems.

We are an authorised distributor and seller of Sealey and SIP across the radiator tester range. Both supply trade-grade pressure-tester kits with hand-operated air pumps, pressure gauges, and the cap-and-port adapter sets needed to fit a wide range of cooling-system filler-cap and overflow-port designs.

Product pages list the pressure range (typically 0-2 bar / 0-30 PSI for standard automotive systems; up to 3 bar / 45 PSI for some commercial-vehicle high-pressure systems), the pump type (hand pump, foot pump, or shop-air-supplied), the gauge accuracy (typically ±2-3% of full scale on trade-grade testers), the adapter set included (the radiator-cap thread sizes and overflow-port shapes covered — typical kits include 8-15 adapters covering the major automotive and commercial fitments), and any included accessories (cap testers, vacuum re-fill adapters for closed-loop refilling). Cooling-system pressure testing is the standard workshop diagnostic for slow coolant loss, head-gasket suspect, and pre-MOT cooling-system inspection. Always allow the engine to cool to ambient before pressure-testing — testing a hot system is dangerous and gives unreliable readings. Trade pricing on multi-tool and workshop-kit orders is available; contact the team via WhatsApp 07754288583.

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