The Koyorad JR1088J radiator steps in when the factory unit on a Holden Colorado RG manual with a 2.8L diesel or matching D-Max manual starts to seep or clog. You get a core standing 580 mm tall and 636 mm wide, so it can handle slow climbs, sand work and loaded highway runs without coolant temps creeping up. With 38 mm inlet and outlet tubes, the hoses line up like stock.

This radiator runs a 27 mm thick core and an 8 mm breather, so the system purges air properly after a flush. An integrated transmission cooler section is ready for the correct manual-compatible layout, making it a smart buy when freshening the cooling setup. The dimensions match factory shrouds and mounts, so the gear sits right and keeps airflow across the fins where it counts in Aussie heat.

• Suits Holden Colorado RG manual 2.8L diesel from 06/2012-on
• Also suits selected Isuzu D-Max manual applications
• Core height of 580 mm for strong cooling capacity
• Core width of 636 mm to match factory shroud
• 27 mm core thickness balances cooling and clearance
• 38 mm inlet and outlet pipe diameters suit OEM hoses
• 8 mm breather connection aids system bleeding
• Integrated transmission cooler section for compatible layouts
• Direct replacement radiator from Koyorad brand
• Ideal when original radiator leaks or fins corrode

Q: Does this radiator fit automatic Holden Colorado RG models?

No, this radiator is listed for manual models only. Automatic Holden Colorado RG models use a different Koyorad part number, JR1087J. The auto version uses different transmission cooler connections. Always match the part number to the transmission type before ordering.

Q: What engines does the JR1088J suit in the Colorado RG range?

This radiator suits Colorado RG models with the 2.8L diesel engine. The dimensions and hose sizes are matched to this engine and cooling layout. Using it on other engine variants may lead to incorrect hose routing. Check your compliance plate and handbook to confirm engine size before purchase.

Q: Can I reuse my existing radiator cap and hoses with this unit?

In most cases the factory hoses and cap are reused if they are in good condition. The inlet and outlet diameters are 38 mm, matching the standard hose size. Many owners still choose to replace aged hoses while the system is open. Inspect clamps and rubber for cracks or swelling before refitting.

Q: Is the breather connection required during installation?

Yes, the 8 mm breather connection helps remove trapped air from the cooling system. Leaving it disconnected can cause hot spots and unstable temperature readings. Ensure the breather hose is correctly routed and clamped. Always bleed the system following the vehicle workshop procedure.

Koyorad JR1087J radiator for automatic models is listed separately.

Suitable for Holden Colorado RG with 2.8L diesel engine and manual transmission from 06/2012-on. Also suits compatible Isuzu D-Max manual models where Koyorad lists JR1088J as the correct part. Automatic transmission variants require Koyorad radiator JR1087J instead. Confirm core dimensions of 580 mm height and 636 mm width against the original unit before installation. Professional installation is recommended due to cooling system bleed requirements.