What fuse powers the cooling fan circuit in this diagram?

A 40 A COOLING FAN fuse in the engine compartment fuse/relay box (page 13-6), which is hot at all times, feeding circuit 226 DB.

What relays are inside the Constant Control Relay Module?

The CCRM contains the HEDF relay, the EDF relay, and the A/C clutch control.

What wire colors feed the engine cooling fans?

Circuit 536 GY/R feeds the fans directly, and 538 GY/R feeds through the engine cooling fan dropping resistor (connector C193). Fan #1 uses connector C1063 and Fan #2 uses C1064; both ground through 57 BK at splice S145 to ground G105.

How is the A/C clutch wired in this circuit?

Circuit 347 BK/V runs through connector C161 to the A/C clutch field coil, which grounds via 57 BK through splice S108 to ground G103. Circuit 879 DG/W connects the A/C high pressure switch (C1069) and PCM pin 40, and 331 PK/V returns to PCM pin 69.

Home/ Registry/ Ford/ Taurus/ 1996-1999/ 1997 Ford Taurus/ Photo supermotors.net/registry/media/583907

1997 Ford Taurus Cooling Fan Wiring Diagram - CCRM, EDF/HEDF Relays & PCM

Engine cooling fan and A/C clutch wiring diagram with HEDF/EDF relays

‹ ›

Wiring diagram showing engine cooling fan circuits, HEDF and EDF relays, A/C clutch field coil and color-coded wires.

AI caption November 2007 · Photo 339 of 579

This is a factory-style wiring diagram page showing the engine cooling fan and A/C clutch control circuit for a Ford vehicle (uploaded as a 1997 Taurus document). Power comes from a 40 A COOLING FAN fuse in the engine compartment fuse/relay box (page 13-6), hot at all times, feeding circuit 226 DB through splice S132 into the Constant Control Relay Module (CCRM), which contains the HEDF relay, EDF relay, and A/C clutch control. A callout explains that the PCM determines when the fan operates by monitoring engine coolant temperature, vehicle speed, and A/C status; the PCM commands the module via circuit 639 LG/P (C1013, C131, C130F/C130M). Outputs include 536 GY/R and 538 GY/R (through the engine cooling fan dropping resistor at C193) to Engine Cooling Fan #1 (C1063) and Fan #2 (C1064), grounded via 57 BK at S145 to G105 (grounds page 10-5); 879 DG/W to the A/C high pressure switch (C1069, pages 54-2, 55-2) and PCM pin 40; 347 BK/V to the A/C clutch field coil (C161) grounded at S108/G103 (grounds page 10-3); and 331 PK/V back to PCM pin 69. Circuit numbers, wire colors, splices, and connector IDs are all labeled.

Is this accurate? Sign in to help verify it.

Frequently asked questions

What fuse powers the cooling fan circuit in this diagram?: A 40 A COOLING FAN fuse in the engine compartment fuse/relay box (page 13-6), which is hot at all times, feeding circuit 226 DB.
What controls when the cooling fans operate?: The Powertrain Control Module (PCM) determines when the fan operates by monitoring engine coolant temperature, vehicle speed, and A/C status. It signals the Constant Control Relay Module via circuit 639 LG/P.
What relays are inside the Constant Control Relay Module?: The CCRM contains the HEDF relay, the EDF relay, and the A/C clutch control.
What wire colors feed the engine cooling fans?: Circuit 536 GY/R feeds the fans directly, and 538 GY/R feeds through the engine cooling fan dropping resistor (connector C193). Fan #1 uses connector C1063 and Fan #2 uses C1064; both ground through 57 BK at splice S145 to ground G105.
How is the A/C clutch wired in this circuit?: Circuit 347 BK/V runs through connector C161 to the A/C clutch field coil, which grounds via 57 BK through splice S108 to ground G103. Circuit 879 DG/W connects the A/C high pressure switch (C1069) and PCM pin 40, and 331 PK/V returns to PCM pin 69.