The Koyorad JR2871HP radiator steps in when the factory unit in a Holden Colorado from 2012 or RG Trailblazer from 2016 struggles with heat. A core height of 580 mm and width of 655 mm give plenty of face area for airflow while towing or loaded with gear. A 48 mm thick core adds extra coolant volume so you can tackle long climbs without watching the temp gauge every minute.

This radiator runs 38 mm inlet and outlet diameters to match standard hoses so the setup stays straightforward in the shed. An 8 mm breather helps shift trapped air and keep coolant circulating across the full 580 by 655 mm core. The built-in transmission cooler supports autos that work hard on tracks or highways. If you want solid cooling gear for Aussie conditions this unit is a smart buy.

• Koyorad JR2871HP replacement radiator
• Suits Holden Colorado 2012-on models
• Suits Holden RG Trailblazer 2016-on
• Core height measures 580 mm
• Core width measures 655 mm
• Core thickness measures 48 mm
• 38 mm inlet and outlet hose necks
• 8 mm breather connection on tank
• Integrated automatic transmission cooler circuit
• Ideal for 4x4 touring and towing setups

Q: Does this radiator fit all engine options in the 2012-on Holden Colorado range?

It suits models that use a radiator with a 580 mm high by 655 mm wide core and 38 mm hose necks. Always compare these measurements with your existing radiator before ordering the gear. If the dimensions and hose locations match, the setup will be much more straightforward. When in doubt, check your VIN details against workshop data.

Q: Is the transmission cooler inside this radiator suitable for automatic gearboxes used for towing?

Yes, the radiator includes an integrated transmission cooler circuit. This cooler uses the same core package that measures 580 mm high and 48 mm thick, giving good thermal contact with coolant. For heavy towing some owners still run an extra external cooler in series. That choice depends on trailer weight and driving conditions.

Q: Do I need new radiator hoses when installing this unit?

Not necessarily, as the inlet and outlet diameters are 38 mm which matches many factory hoses on these Holdens. If your existing hoses are in good condition and match the 38 mm necks they can usually be reused. If hoses feel hard, cracked or swollen it is a good time to replace them. Fresh clamps and coolant are also recommended during the job.

Q: Is this radiator suitable for long-distance touring across hotter parts of Australia?

The large 580 x 655 mm core and 48 mm thickness are well suited to extended highway and track use in warmer regions. The extra core depth gives more coolant volume and fin area to manage heat buildup. The built-in transmission cooler helps autos that see long climbs or sand work. As always, correct coolant mix and a clean grille or bullbar opening are important.

Suitable for Holden Colorado models from 2012-onwards.

Suitable for Holden RG Trailblazer models from 2016-onwards.

Check core height of 580 mm against existing radiator before installation.

Confirm inlet and outlet diameters of 38 mm match existing hose setup.

Professional installation is recommended for correct coolant and transmission cooler connection.