This post if for folks looking to install SPAL Fans into their Maxima. These are quality high-speed fans that are great for both N/A and Boosted Setups.

PDF Instructions:

SPAL Fan Wiring


We designed the SPAL fan wiring harness to enable the simplest installation of our performance fans. It is compatible with all types of vehicles and can be installed on positive or negative ground vehicles with no modifications

  • 185 Degree Thermostat Controlled Relay (185FH)
  • 195 Degree Thermostat Controlled Relay (195FH)

Installing the fan:

When installing electric cooling fans, it is important to cover as much surface area as possible. Mount the fan as high up on the core as possible. Attach the fan to the small area around the core of the radiator where there is a metal lip that is approximately 1/4″ to 3/8″. This will allow mounting of the fan(s) without compromising the core of the radiator.


Mount the relay in a secure place in the engine compartment away from heat sources. Once this is completed, connect the wires per the diagram and notes below.

  • Red: Connect to the red wire of fan pigtail with pre-terminated yellow crimp.
  • Gray: Connect to thermostat socket (sending unit) with blue ring crimp connector.
  • Yellow: Connect to positive battery terminal using the fuse holder and yellow crimp connectors per diagram (see back).
  • Orange: Connect to ignition switch +12 vdc when engine is in run position. (Hook to constant +12 vdc for the fan to run continuously when the engine is hot even when the ignition switch is off).
  • Black: Connect ring terminal to chassis ground.
  • Fuse Holder: Connect fuse holder inline per diagram within 12″ of the battery using ring terminal or equivalent.* Note: On medium profile fans use a 20 amp fuse, on low profile fans use a 15 amp fuse

Installing the Thermostat Switch:
The sensor has 3/8″ pipe thread. The thermostat supplied with the kit is an OE type that is designed to mount in the cylinder head of the engine. However, any mounting in water jacket is suitable. The 195FH sending unit comes on at 195 degrees and off at 175 degrees. The 185FH module turns on at 185 degrees and off at 165 degrees. The modules will work on the majority of applications. If a different size adapter is needed, the correct size thread adapter can be found at most automotive parts or hardware stores (1/2″ adapter included in the kit) . Do not use Teflon tape on the sensor it can cause poor electrical contact and incorrect temperature readings.

Wiring Diagrams

Spal Electric Fan Directions


If you don’t use a good relay like the one above, this will happen (Photo Courtesy of Javon Bennet)