Parts for your 2013 Holden Colorado-Radiator

2013 Holden Colorado Radiator: What it does and how to look after it

Based on technical documentation for the RG-series Colorado — including the 2013 Holden Colorado Owner’s Handbook (Cooling System section), GM Service Information (Cooling System Description and Operation), and common parts catalogues from ACDelco/Natrad listing direct-fit radiator assemblies for 2012–2016 models — the 2013 Holden Colorado is unquestionably fitted with a front-mounted aluminium radiator as part of its liquid engine cooling system.

This radiator is the workhorse that keeps the Colorado’s diesel or petrol donk in its happy temperature zone. Coolant carries heat away from the block and head, the radiator sheds that heat to passing air, and the thermostat, water pump, cap, fan(s) and expansion tank round out the system. On many automatic models, the radiator may also house an integrated transmission fluid cooler in one tank, with or without an extra auxiliary cooler — handy when towing the boat or lugging gear.

For regular servicing, a healthy radiator means reliable starts, steady temps on climbs, and less stress when the mercury climbs. The vehicle is designed for long-life OAT coolant (Dex‑Cool type), so stick with the specification in the handbook and avoid mixing green or blue types. A proper premix with demineralised water helps keep scale and corrosion at bay.

• Check the expansion tank level when the engine is cold and top up with the correct coolant mix only.
• Inspect hoses, clamps, the radiator cap seal, and the fan shroud, replace anything cracked, soft, or weeping.
• Blow out bugs, seeds and mud from the radiator/condensor/intercooler stack, especially after off‑road or farm work.
• Have the system pressure‑tested if there’s any hint of coolant smell, drops under the ute, or unexplained temperature swings.

When a radiator is due — think repeated overheating, stained end tanks, crusty seams, swollen plastic, or fins that are bent flat — go for an OE‑quality alloy crossflow unit. During replacement, it’s smart practice to fit a new cap, check the thermostat, and renew tired hoses. If automatic transmission cooler lines connect to the radiator, cap them during the swap and torque the fittings correctly. After refilling with the specified coolant, bleed air from the system and verify fan operation (thermo or viscous hub as equipped). For heavy towing or outback kilometres, shorter coolant service intervals and more frequent cleaning pay for themselves in engine longevity.

• What coolant does a 2013 Holden Colorado use?
  Holden specifies a long‑life OAT coolant (Dex‑Cool type). Using the correct premix (or concentrate with demineralised water) helps prevent scale and corrosion. Mixing with conventional green or blue coolant isn’t recommended, as it can shorten service life and cause sludge.
• How often should the coolant be changed?
  With long‑life OAT coolant, the interval is typically extended compared with older IAT coolants. Many RG Colorados follow a multi‑year, high‑kilometre schedule, harsh use (towing, dusty work) can justify earlier changes. The precise interval should be taken from the vehicle’s owner’s handbook for the specific VIN and market.
• Does the radiator include a transmission cooler?
  Many automatic 2013 Colorados use an in‑tank ATF cooler in the radiator and may also have an auxiliary cooler in front of the stack. If ATF lines enter the radiator end tank, treat them carefully during removal and ensure correct reconnection and leak checks after installation.