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1979-2004 Mustang Parts
Used/Take Off Mustang Parts
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Download the new 2007 Brothers Performance Warehouse Mustang Parts catalog (in PDF format).
2012 Railroad St.
Corona, CA 92880
Directions and Map
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Open M-F 7am-6pm PSTOpen Sat. 9am-4pm PST
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Manual Fan Control Switch Installation
The fan is controlled by the PCM and/or the Constant Control Relay Module (CCRM), when the EEC detects certain temperatures it will switch the fan to either it's low or high speed settings. The A/C will turn the fan to high speed when it is set to max.
But how can you bypass both the EEC and CCRM and install a manual switch to control the fan operation?
First you will have to disconnect the NEGATIVE battery terminal and locate the CCRM and a pin on its connector.
The CCRM module is located LEFT (you looking at engine) of the radiator reservoir/overfill bottle.
Now that you located the CCRM, remove the connector, you will need a 6mm socket to detach the connector from the CCRM housing.
5.0 models:Locate PIN / WIRE #17 (GREEN with PURPLE stripe) on the connector, it should be easy to spot, the connector has numbers for each pin.
Next you will have to TAP a wire to #17, don't CUT THE #17 WIRE !!!, you could use a scotchlock connector to tap into it, OR REMOVE about 2 mm of insulation and wrap your wire to #17.
Get a second wire and connect it to a GOOD GROUND, now run BOTH wires into the cockpit through the firewall, choose a spot to install the SWITCH, connect the wires to each of the 2 switch terminals.
Now is test time, turn key to ON, and flip the switch......READY!!!
NOTES FOR 4.6L SOHC and DOHCHook into pin#46 on the PCM, that is located behind the passenger side kickpanel. Once you tie into that pin all you do is run it to the toggle switch, and run the other side of the switch to ground.
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Watch for new tech notes and tips, as we continually update and add information to this section.
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