Transmission Oil Cooler - Hydra-Cool^® 23 Plate

Universal 3/8" Hose | Part Number: #678

The Davies Craig Hydra-Cool^® 23 Plate Transmission Oil Cooler is a premium cooling solution engineered to keep automatic transmission fluid (ATF) at its optimum operating temperature. Featuring advanced plate & fin technology, the Hydra-Cool^® design delivers superior heat transfer while requiring up to 33% less mounting space than a comparable tube & fin cooler, making it ideal for modern engine bays where space is at a premium. High-efficiency internal turbulators maximise heat dissipation while maintaining low pressure drop for outstanding cooling performance.

Designed for performance vehicles, 4WDs, towing, commercial fleets and motorsport applications, the Hydra-Cool^® 23 Plate Oil Cooler effectively reduces transmission temperatures to protect against premature wear and costly repairs. Manufactured from lightweight aluminium and 100% pressure tested to 150 psi, every Hydra-Cool® Oil Cooler is built for long-lasting durability and reliability.

Features

• Premium Hydra-Cool^® Plate & Fin design
• Up to 33% more efficient than comparable tube & fin coolers
• Compact design requiring less mounting space
• Reduces automatic transmission fluid temperatures
• Protects against heat-related transmission wear and failure
• High-efficiency internal turbulators for superior heat transfer
• Lightweight all-aluminium construction
• 100% pressure tested to 150 psi
• Pre-drilled mounting plates for easy installation
• 3/8" (9.5 mm) push-on fittings
• Designed and engineered by Davies Craig

Applications

Recommended for:

• Passenger vehicles
• Performance and modified vehicles
• 4WD and off-road vehicles
• Towing and caravan vehicles
• Commercial vehicles
• Fleet vehicles
• Motorsport and racing applications
• Vehicles with limited mounting space

Kit Contents

• 1 × Hydra-Cool^® 23 Plate Transmission Oil Cooler
• 1 × 1.4m (3/8") Transmission Hose
• 4 × Hose Clamps
• 2 × Quick Fit Kits (4 Nylon Mounting Ties per Kit)
• Installation Instructions

Specifications

Why Install a Hydra-Cool^® Transmission Oil Cooler?

Heat is one of the leading causes of automatic transmission failure. Heavy towing, stop-start traffic, steep climbs, off-road driving and high-performance applications all increase transmission fluid temperatures, reducing lubrication and accelerating wear on internal transmission components.

The Davies Craig Hydra-Cool^® 23 Plate Transmission Oil Cooler removes excess heat before the fluid returns to the transmission, helping maintain optimum operating temperatures, improve shift quality and extend transmission life. Its premium plate & fin construction delivers exceptional cooling efficiency in a compact package, making it the ideal solution for vehicles requiring maximum cooling performance.

SPECIFICATION & RANGE Transmission & Engine Oil Coolers
Part #	Image	Plates	Thickness  mm	Overall		Core		Inlet/Outlet Size	Hose Size	Heat Transfer Rate (BTU/HR)	Fluid Capacity
				Width mm	Height mm	Width mm	Height mm
Power Steering Cooler &  Ultra-Cool Transmission Oil Cooler (Tube & Fin)
1009		Tube & Fin	19	237	64	148	64	3/8” 9.5mm	3/8” (9.5mm) 1.2m	4,000	43ml
401			20	326	128	245	128			9,000	122ml
403			20	326	191	246	191			10,800	207ml
404			20	395	191	316	191			12,000	248ml
Hydra-Cool Transmission Oil Cooler (Plate & Fin)
676		12	20	281	141	281	112	3/8” 9.5mm	3/8” (9.5mm) 1.4m	11,987	81ml
677		17	20	281	180	281	152			13,394	115ml
678		23	20	281	229	281	200			13,937	158ml
679		30	20	281	300	281	265			15,710	201ml
Transmission Oil Cooler & Fan Combo Kits
698 (12V)		23	76	281	229	281	200	3/8” 9.5mm	3/8” (9.5mm) 1.4m	13,937	158ml
699 (24V)
691 (12V)		30	76	281	300	281	265			15,710	201ml
692 (24V)
Universal Engine/Transmission Oil Cooler
602		14	32	258	224.5	258	185.5	AN10 ORB	N/A	21,000	500ml
605		19	50	330	166	285	142			37,000	440ml
610		30	50	330	249	285	226			50,000	690ml
616		14	32	258	224.5	258	185.5	M16	N/A	21,000	500ml
Universal Engine/Transmission Oil Cooler & Fan Combo Kits
600 (12V)		14	87	258	224.5	258	185.5	AN10 ORB	N/A	21,000	500ml
608 (12V)		30	106	330	249	285	226			50,000	690ml
614 (12V)		14	87	258	224.5	258	185.5	M16	N/A	21,000	500ml
Accessories
1005		5/16" (8mm) Adaptor Kit - Transmission Oil Cooler to suit GM transmissions
1006		Transmission Oil Cooler Fitting Kit (6R80) Suits Ford Ranger and Mazda BT50
1007		Transmission Temperature Sensor Adapter Kit - suits 3/8” Hose and 1/4” NPT Sensor
1008		AN10 ORB to 3/8" Push on Hose Barb Fitting
1010		Transmission Oil Cooler Fitting Kit (AN10 ORB to 3/8" Hose)
579		Quick Fit Kits (Mounting Kit)
0444 0445 0500		Digital Thermatic® / Electric Fan Switches