The Koyorad JR1087J radiator drops straight into setups that match a core size of 580 mm high and 636 mm wide so you can keep a 2.8L diesel working hard without watching the temp gauge. The 27 mm core thickness gives enough volume for coolant flow while still letting plenty of air through in slow crawls or stop start traffic. The integrated 292 mm trans cooler section keeps the auto from building heat when you are hauling gear. This radiator runs 38 mm inlet and outlet necks so hoses line up with factory plumbing on the specified models. The 8 mm breather port helps bleed trapped air which protects against hot spots in alloy heads and gaskets. The whole setup suits touring rigs that spend hours at highway speed in warm air. You get straightforward dimensions and known fitment so you can bolt it in and get out there again.

• Suits specified Holden Colorado RG A/T 2.8L models
• Compatible with selected Isuzu D-Max and Trailblazer models
• Core height measures 580 mm for ample cooling area
• Core width of 636 mm increases frontal airflow exposure
• 27 mm core thickness balances coolant volume and air passage
• 38 mm inlet and outlet diameters match common hose sizing
• 8 mm breather diameter assists effective system bleeding
• Integrated 292 mm transmission cooler for automatic gearboxes
• Direct style replacement where dimensions and mounts match
• Suitable for towing and touring setups within listed applications

Q: Does this radiator include an integrated transmission cooler?

Yes, this radiator includes an integrated transmission cooler section measuring 292 mm. That cooler section is built into the bottom tank and is designed for automatic transmission fluid on the listed vehicles. Always reconnect the transmission lines carefully and top up fluid to the correct level after installation. A cooler like this helps keep gearbox temperatures in check under towing or heavy load.

Q: What core dimensions should I check before ordering?

You should confirm a core height of 580 mm a core width of 636 mm and a core thickness of 27 mm. Matching these three measurements against your existing radiator helps confirm physical fit in the support panel. Hose outlet locations should also sit close to your current unit when you compare visually. Taking a minute to measure avoids hassles once the cooling system is drained.

Q: What hose sizes does this radiator suit?

This radiator suits hose connections with 38 mm internal diameters for both inlet and outlet. Checking your top and bottom radiator hoses for that size helps confirm compatibility. Using hoses that are too loose or too tight can cause leaks or strain on fittings. If your existing hoses are worn it is a good time to replace them with new 38 mm units.

Q: Is there a breather or bleed port on this radiator?

Yes this radiator includes an 8 mm breather port. That small connection helps release trapped air from the cooling system during fill and bleed. Air pockets can cause hot spots around cylinders and reduce the effectiveness of the coolant mix. Bleeding through this port as per workshop practice supports stable operating temperatures.

Suits Holden Colorado RG automatic transmission models built from June 2012 onwards with 2.8L engines. Also suits Isuzu D-Max models listed for this part number. Also suits Holden Trailblazer models from 2016 onwards where this radiator is specified. Always compare core dimensions of 580 x 636 x 27 mm and hose diameters of 38 mm before installation.