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Mercedes Fan Controller v3

This module provides the necessary signals to turn on C-Class electric fans from Mercedes.  Simply tying the Trigger line to a constant +12v will damage the controller box for the fan in short order. These electric fans move an incredible amount of air; enough to cool the biggest of engines! The controller commands the fan to run only at the speed necessary, reducing noise and power usage.

The controller has the ability to use one of two temperature sensors, or it may piggyback on a 0-5v EFI temperature sensor.

Fan Controller v3 Manual - Updated 4/14/2019

Price is $140. Includes a harness and dash status LED.

The controller works with two different temperature sensors:
3/8" NPT: GM sensor TX3 or TX3T. Available from Rockauto or local autoparts places. Pigtail is Pico # 5615PT.

1/8" NPT: Autometer # 2258. Available from Summit Racing or local autoparts places.

Please select the option with the shipping method you desire. These shipping prices are for one controller. Please contact me for a more accurate quote for multiple controllers.

Please allow up to one week for shipment, if the controllers are in stock.

Current stock: 5

Backorder available. Please allow 4-6 weeks for more to be manufactured. I will update the site/email you if this is the case.

New option: Build your own harness, to your own desired length! I supply the 10 pin plug and pins, and any weatherpack connectors you need. Serious builders only. Good wire crimper absolutely necessary! Contact me if you want this option.

Domestic (United States) Shipping Options:


Shipping Method

Fan Controller v3 USPS Priority Domestic - $12.50
Fan Controller v3 UPS Ground Domestic - $15

International Shipping Options:

Fan Controller v3 USPS Priority International - $48
Fan Controller v3 UPS Worldwide Expedited Contact me for shipping quote


GM TX3 temperature sensor + Pigtail - $25 Shipping included with controller
Autometer #2258 - $30 Shipping included with controller
Plug/harness for C-Class fan - $55 Picture 1 Picture 2 Now with larger 6mm wires! Shipping included with controller

New! Reset-able Fuse - $20
Picture 12v, 50A

Shipping included with controller

Here is a demonstration of the fan running at several different speeds.


Here is an overview of the harness that is included with the controller.


Here is a demonstration of how to program the low and high temperature points into the controller.

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