This Koyorad JR7959HD radiator steps in when the factory unit in your Hino based Toyota Dyna or CTN Dutro 300 starts struggling in traffic or on hills. The core stands 545 mm high and 480 mm wide so it fills the grille opening properly and keeps airflow neat. A 48 mm thick core helps when you are crawling in low gear or sitting hooked to a trailer at idle.

Inside the bottom tank a 275 mm transmission cooler keeps auto fluid in check while you tackle stop start delivery work. The 42 mm inlet and outlet necks suit standard hoses so you are not chasing odd sizes mid job. A 10 mm breather port helps bleed the system clean to avoid hot spots. For regular work in Aussie heat this is smart buy cooling gear with straightforward specs you can measure.

• Suits Hino based Toyota Dyna 2006-on No. 4
• Suits Toyota CTN Dutro 300 2007-on A/T
• Core dimensions 545 mm height x 480 mm width
• Core thickness 48 mm for higher capacity
• 42 mm inlet and outlet neck diameters
• 10 mm breather port for system venting
• Integrated 275 mm automatic transmission cooler
• Direct replacement style radiator assembly
• Suitable for work trucks needing consistent cooling
• Koyorad branded cooling gear for commercial use

Q: Does this radiator include an integrated transmission cooler?

Yes it includes a transmission cooler section that measures 275 mm. This cooler sits inside the radiator tank and connects to the automatic transmission lines. It helps control ATF temperature under load or in traffic. Use new sealing washers on the line fittings when refitting.

Q: What core size should I check on my old radiator before ordering?

Measure the core height and width excluding tanks and side frames. This radiator core is 545 mm high and 480 mm wide. The thickness is 48 mm through the fin pack. Matching these three measurements helps confirm compatibility with your existing shroud and mounts.

Q: What size are the hose connections on this radiator?

Both the inlet and outlet necks are 42 mm diameter. This matches the standard hose size on the listed Hino and Toyota models. Reusing hoses in good condition is usually fine but many owners choose to replace them at the same time. Fresh clamps reduce the chance of leaks after refill.

Q: Is this radiator suited to vehicles that idle for long periods?

The 48 mm thick core and 545 mm height provide good coolant volume for idle and low speed work. These specs help shed heat when airflow is mainly from the engine fan not road speed. Keeping the fins clean and the shroud intact is important. Regular coolant changes will also support stable temperatures.

Suits Hino based Toyota Dyna models from 2006-onwards listed as No. 4. Suits Toyota CTN Dutro 300 models from 2007-onwards with automatic transmission. Radiator includes an integrated transmission cooler of 275 mm to suit A/T models. Confirm core size of 545 mm x 480 mm x 48 mm and inlet and outlet diameters of 42 mm against the original unit before fitment.