Digital Thermatic^® Fan Switch - GEN II with ¼" NPT Sensor & 38mm Inline Adapter

12 & 24 Volt | Part Number: 0488

(Supersedes Part No. 0438)

The Digital Thermatic® Fan Switch GEN II (Part 0488) is the next evolution of Davies Craig’s proven fan controller, replacing the popular Part 0438. Designed for improved usability, flexibility, and durability, the GEN II delivers enhanced control of single or dual electric fans with smarter features and a more installer-friendly design.

What’s New

• Improved Display & Layout
  • Larger, clearer LED display with °C / °F units
  • LED repositioned for better visibility
  • All wiring relocated to the rear for cleaner, easier installation
• Faster Dual Fan Operation
  • Second fan start-up delay reduced to 5 seconds for improved cooling response
• Advanced Override Control
  • Dual manual override wires for independent fan control
  • Selectable override signal polarity (positive or negative)
• Enhanced Durability
  • Upgraded to IP67 rating for superior water and dust protection
• Expanded Temperature Range
  • Adjustable from 5°C to 110°C (41°F to 230°F)

38mm Inline Adapter – Simple Sensor Installation

The included 38mm Inline Sensor Adapter provides a quick and reliable way to install the thermal sensor directly into your cooling system:

• Fits neatly into your top radiator hose (38mm ID)
• Allows easy sensor installation without modifying engine components
• Two 1/4" NPT ports enable:
  • Thermal sensor fitment
  • Optional air bleed functionality
• Includes a bung if only one port is required

Flexible sizing options:

• Up to 44mm hose compatibility with 3mm adaptor sleeve (Part #18510)
• Up to 50mm hose compatibility with 6mm adaptor sleeve (Part #18511)
• *Sold Separately

This design makes installation faster, cleaner, and more versatile across a wide range of vehicle applications.

Key Features

• Digital temperature control with easy push-button adjustment
• Dual relay outputs for independent fan operation
• Automatic fan staging for efficient cooling
• Memory retention of temperature settings
• Designed for direct coolant measurement using included 1/4" NPT thermal sensor
• Suitable for 12V systems (24V compatible with relay change, part #10534, sold separately)

How It Works

• Fan 1 activates at your set temperature
• Fan 2 activates 5 seconds later for staged cooling
• Both fans switch off once temperature drops 5°C below set point

Installation Flexibility

• Direct coolant measurement via included 1/4" NPT sensor (ideal for thermostat housing, radiator, engine block or inline adapter)
• Radiator probe mounting or direct coolant measurement options
• Inline adapter compatibility for hose installation
• Simple wiring with clearly labelled connections (battery, ignition, fan outputs, overrides)

(Refer to installation diagrams and wiring layout shown on page 3 of the instructions for full setup guidance.)

Specifications

• Voltage: 12V (24V compatible with relay change)
• Temperature Range: 5°C – 110°C (41°F – 230°F)
• Continuous Current: 30A (40A max)
• Start-Up Current: 60A
• Protection Rating: IP67

What’s Included (Part No. 0488)

• Digital Thermatic® Fan Switch GEN II
• Temperature Probe & Mounting Kit
• 1/4" NPT Thermal Sensor Kit
• 38mm Inline Adapter
• Wiring connectors and terminals
• Hose clamps and mounting hardware

Why Upgrade?

The GEN II isn’t just an update—it’s a complete usability and performance improvement over previous models. With smarter control, faster response, improved installation design, and direct coolant sensing capability, it delivers everything needed for modern cooling systems.

Thermatic^® Fan & EWP^® Switch / Controller Range

Specs
	Part #0480	Part #0444	Part #0401	Part #0500	Part #0555	Part #0550	Part #8003
Supersedes Part No.	#0444, #0445, #0448 #0435, #0438	N/A	N/A	N/A	N/A	N/A	#8002, #8102
Sales Variation	#0481, #0482, #0483, #0485, #0488	#0445, #0448 #0435, #0438	#0400, #0404	#0501	#0556	#0551	#8103
Operating Voltage	12 & 24 Volt	12 & 24 Volt	12 & 24 Volt	12 & 24 Volt	12 & 24 Volt	12 & 24 Volt	12 & 24 Volt
Maximum Current	40 Amps	40 Amps	20 Amps	40 Amps	40 Amps	N/A	12 Amps EWP Only
Fan Application	MAX 30A Each	MAX 30A Each	Relay Switching Current MAX 15A	All DCPL Fans, EWPs & EBPs	All brushed DCPL Fans, EWPs	All Brushless DCPL Fans, EWPs	All DCPL Fans, EWPs
Speed	Single Speed	Single Speed	Single Speed	Single Speed	Variable Speed	Variable Speed	Single speed Fan & Variable EWP
Single Fan Control					Brushed FAN only	Brushless FAN only
Duel Fan Control			Wiring Dependant		Brushled FANs only	Brushless FANs only
EWP control	ON / OFF ONLY (USE 8003)	ON / OFF ONLY (USE 8003)	ON / OFF ONLY (USE 8003)	ON / OFF ONLY (USE 8003)	Brushed EWPs only	Brushless EWPs only
EBP control	ON / OFF ONLY	ON / OFF ONLY	ON / OFF ONLY	ON / OFF ONLY
EWP/EBP and Fan control			Wiring Dependant				EWP and Fans only
Duel Fan Start-Up Delay	5 Seconds	10 Seconds		Independent set Temperature	4 independent Operating modes	5 independent Operating modes	Independent set Temperature
Manual Override - Turn On	2 Fan Override Wires		use #0404	Selectable Fan Override	2 Fan Override Wires	2 Fan Override Wires	2 Fan + 1 EWP Override Wire
Manual Override - Turn off					2 Fan Override Wires	2 Fan Override Wires
Manual Override - Voltage Selection
°C  to °F Change			No temperature units
Temperature Setting Range	5°C To 110°C (41°F To 230°F)	40°C To 110°C (104°F To 230°F)	40°C To 100°C (104°F To 212°F)	5°C To 110°C (41°F To 230°F)	5°C To 110°C (41°F To 230°F)	5°C To 110°C (41°F To 230°F)	40°C To 110°C (104°F To 230°F)
Temperature Setting Method	Push Button	Push Button	Turn Knob	Push Button	Push Button	Push Button	Push Button
Coolant Temperature Detection	Requires #0409 or #0465	Requires #0409 or #0465		Requires #0409 or #0465
Air Temperature Detection
Transmission Temperature Detection	Fluid measurment Requires #0465	Ambient temperature only		Fluid measurment Requires #0465
Display Type	Led Segment	Led Segment		Led Segment	Led Segment + Status LEDs	Led Segment + Status LEDs	Colour LCD
Temperature Display
Sensor Fault Display
Fan Operation Indicator							EWP and Fan1 and FAN2
Over Temperature Warning
Audible alarm
Display dimmer
Mounting position	Engine bay	Engine bay	Engine bay	Vehicle Cabin	Engine bay	Engine bay	Vehicle Cabin
Mounting options	Built in Mounting holes	Built in Mounting holes	Bracket supplied	Universal 52mm gauge	Built in Mounting holes	Built in Mounting holes	Verious Mounting Options supplied