• Holden Colorado RG – 2.8L 4-Cylinder Turbo Diesel | 2012–2020
• Holden Trailblazer LWH – 2.8L 4-Cylinder Turbo Diesel | 2012–2020

✅ Direct bolt-on fitment — no cutting or welding required

How It Works: Installs inline on the transmission return line. Hot ATF sheds heat through the high-efficiency fin-and-plate core, stabilizing temps on long climbs and heavy tows. Keeps your 6L50 transmission operating in the safe zone.

Key Features:

• 32mm, 14-row fin and plate core — high-efficiency cooling in compact size
• Drops ATF temps by up to ~33°C under heavy load
• 50% more efficient than tube and fin coolers
• Black powder-coated finish — Arctic Black series corrosion resistance
• Pressure tested to 150 PSI — no leaks, no compromises
• RG-specific 4mm laser-cut alloy brackets
• SAE J1019 high-pressure ATF hose (400 PSI burst rating)
• Internal turbulators for maximum heat transfer
• Stainless hardware and M16 fittings
• Bolt-on installation — no cutting required

💡 Why This Matters: Towing, sand, and slow climbs spike ATF temps. Above 93°C, ATF degrades fast—seals and clutches suffer. The 6L50 transmission is a good gearbox when kept cool, but heat is its enemy. This cooler drops temps by up to 33°C, keeping your Colorado in the safe zone and dramatically extending gearbox life.

Heat destroys transmissions. The RG Colorado's 6L50 transmission is a capable unit, but like all automatics, it's vulnerable to heat damage. Towing, sand driving, and slow climbs are the worst offenders.

Benefits:

• 💥 Prevents transmission overheating — especially when towing or in sand
• ❄️ Drops ATF temps by up to 33°C under heavy load
• ⚠️ Keeps temps below 93°C — the critical threshold for ATF breakdown
• ⏱ Target temps: 70–90°C for longevity and shift quality
• 🛡️ Protects seals and clutches from heat damage
• 💰 Extends ATF and transmission life
• 🚛 Essential for towing — keeps temps safe under maximum load

💡 The Science: For every 10°C increase in transmission temperature above normal operating range, ATF life is cut in half. The RG Colorado's 6L50 runs hot, especially when working hard. By dropping temps into the 70–90°C sweet spot, this cooler can literally double or triple the life of your transmission. It's cheap insurance for an expensive component.

Cooler Core:

• Type: 32mm fin and plate design
• Configuration: 14-row core
• Series: Arctic Black (black powder-coated)
• Efficiency: 50% more efficient than tube and fin coolers
• Finish: Black powder-coated for corrosion resistance
• Pressure Rating: Tested to 150 PSI
• Features: Internal turbulators for maximum heat transfer

Performance:

• Temperature Reduction: Up to ~33°C under load
• Target Operating Range: 70–90°C
• Optimal for towing, sand driving, and heavy-duty use
• Designed specifically for 6L50 transmission

Mounting & Fittings:

• Brackets: RG-specific 4mm laser-cut alloy
• Hose: SAE J1019 high-pressure ATF hose (400 PSI burst)
• Fittings: M16 stainless fittings
• Hardware: Stainless mounting hardware included
• Installation: Direct bolt-on (no cutting or welding)

• 32mm, 14-row fin and plate cooler — Arctic Black powder-coated
• RG-specific 4mm laser-cut alloy brackets
• SAE J1019 high-pressure ATF hose (400 PSI burst rating)
• Stainless mounting hardware
• M16 stainless fittings
• Internal turbulators (pre-installed in cooler)
• Hose clamps and connectors
• Installation guide

✅ Complete bolt-on kit — everything needed for installation included

🔥 Need More Cooling? For extreme towing or competition use, check out our Dual Cooler Kit (TCD602DPK) for maximum protection.

Recommended: Competent qualified mechanic or experienced DIYer

DIY Time: 2–3 hours

Installation Notes:

• Mounting location: In front of radiator/AC condenser for maximum airflow
• Uses RG-specific laser-cut brackets — direct bolt-on
• Plumbs inline with transmission return line
• No cutting or welding required
• All fittings and hoses included

Important Notes:

• Requires working with transmission fluid lines
• Small top-up of ATF needed for cooler/hose volume
• Check ATF level hot, in Park, after cycling gears
• Generally compatible with bull bars/winches — ensure proper airflow
• Avoid hose kinks during routing

Important: Installation requires working with transmission fluid lines. If not comfortable with this type of work, professional installation is recommended. Detailed installation guide included with kit.

Maintenance Schedule:

• Visual inspection during regular services
• Check for leaks at fittings and connections
• Inspect cooler for physical damage (rock strikes, debris)
• Clean cooler fins if blocked by mud or debris
• Monitor ATF level and condition regularly
• Check ATF temperature if equipped with temp gauge

💡 Pro Tip: The Arctic Black powder-coated finish is tough, but if you frequently drive in mud, sand, or water, occasionally rinse the cooler core with a gentle stream to prevent debris buildup. This ensures maximum airflow and cooling efficiency—especially important for heavy towing or beach driving.

Q: Will this void my Holden warranty?

A: No. Aftermarket transmission coolers don't void warranty under Australian Consumer Law. They're a common upgrade for vehicles used for towing or heavy-duty work.

Q: Do I really need a transmission cooler on my Colorado?

A: If you tow, drive in sand, tackle steep climbs, or drive in hot climates—absolutely. Even if you don't, the RG Colorado's 6L50 runs warm, and a cooler extends ATF and transmission life significantly. It's cheap insurance for an expensive component.

Q: How much cooler will my transmission run?

A: This cooler can drop ATF temperatures by up to 33°C under heavy load. Even moderate reductions of 15-20°C make a huge difference to transmission longevity by keeping temps in the safe 70–90°C range.

Q: What is the target temperature range?

A: Target ATF temps are 70–90°C for optimal longevity and shift quality. Above 93°C, ATF degrades rapidly and seals/clutches suffer. This cooler keeps you in the safe zone.

Q: Do I need to add extra ATF?

A: Yes — a small top-up is required to account for the cooler and hose volume (typically 0.5-1L). After installation, check ATF level hot, in Park, after cycling through all gears. Top up to the correct level on the dipstick.

Q: Where does the cooler mount?

A: In front of the radiator and AC condenser for maximum airflow. The RG-specific laser-cut brackets provide direct bolt-on mounting using existing holes—no drilling or cutting required.

Q: Will this fit with my bull bar or winch?

A: Generally yes. Most aftermarket accessories don't interfere, but ensure proper airflow and avoid hose kinks during installation. The compact 32mm design helps with fitment in tight spaces.

Q: Can I install this myself?

A: If you're mechanically competent and comfortable working with transmission lines, yes. The kit is bolt-on with pre-cut brackets. Most DIYers complete installation in 2-3 hours. Otherwise, any qualified mechanic can handle it.

Q: What makes fin and plate coolers better than tube and fin?

A: Fin and plate design has 50% more surface area for heat transfer in the same size package. This means better cooling efficiency in a more compact unit—perfect for the RG Colorado's crowded engine bay.

Q: What are internal turbulators?

A: Turbulators are internal baffles that create turbulent flow through the cooler core. This increases heat transfer efficiency by preventing laminar flow—meaning better cooling performance from the same size cooler.

Q: Why is 150 PSI pressure testing important?

A: Transmission systems operate at high pressures, especially under load. A 150 PSI pressure test ensures no leaks under normal or extreme operating conditions. Quality construction means reliability you can trust.

Q: What's the Arctic Black finish?

A: The Arctic Black powder-coated finish provides excellent corrosion resistance—especially important in Australian conditions with mud, water, salt, and harsh weather. It also looks professional and resists rock chips better than bare aluminum.

Q: Is this suitable for extreme towing?

A: Absolutely. This cooler is designed specifically for heavy towing, sand driving, and challenging conditions. If you regularly tow at or near your Colorado's capacity, a transmission cooler is essential protection.

Q: What about the dual cooler option?

A: For extreme use (competition towing, constant heavy loads, or desert racing), we offer the Dual Cooler Kit (TCD602DPK) which adds a second cooler for maximum heat dissipation. Most users find the single cooler (TCB602DPK) more than adequate for normal towing and off-road use.

Q: Does this work with both manual and automatic transmissions?

A: This kit is designed for automatic transmissions (which have fluid cooling systems). Manual transmissions don't typically use fluid coolers. The RG Colorado came with the 6L50 automatic transmission.

Q: Will this help with shift quality?

A: Yes! The 6L50 shifts better when ATF is in the optimal temperature range (70–90°C). Overheated fluid affects shift quality and feel. A transmission cooler helps maintain consistent shift performance, especially under load.

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