What fuses or circuit breakers power the cooling fan circuit in this diagram?

Two Battery Junction Box feeds that are hot at all times: position 17, a 30A circuit breaker (page 13-6) feeding circuit 1155 YE/BK, and position 13, a 50A fuse (page 13-1) feeding circuit 1153 RD/BK.

How does the PCM control the cooling fan?

Per the diagram's callout, when the PCM determines fan operation is required it grounds either the Cooling Fan Low Relay (via circuit 228 DB) or the Cooling Fan High Relay (via circuit 229 RD/OG) to turn on the Cooling Fan Motor. The PCM connects at connector C185, pins 28 and 46 (solid state).

What wire colors feed the cooling fan motor?

The fan motor at connector C109 is fed by circuit 639 LG/VT (light green/violet) from the low relay through C103F/C103M, and circuit 638 OG/LB (orange/light blue) from the high relay. Ground is circuit 57 BK to G102.

What supplies power to the cooling fan relay coils?

The PCM Power Relay in the Relay Center (pins 30 and 87), hot in Start or Run, feeds circuit 361 RD through splice S116 to both the Cooling Fan Low Relay and the Cooling Fan High Relay.

Where are the ground and engine control details referenced?

The diagram references Engine Controls on pages 23-2, 23-8, 24-1, 24-2 and 24-6, and Grounds on pages 10-2 and 10-3 (ground point G102).

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Ford/Mercury Cooling Fan Wiring Diagram - Low/High Relays, PCM, Circuit 361 RD

Wiring diagram of engine cooling fan circuit with relays, PCM, and color-coded wires

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Wiring diagram of the engine cooling fan circuit showing low and high fan relays, PCM control, fuses, and color-coded wiring to the fan motor.

AI caption March 2011 · Photo 52 of 86

This document is a factory-style wiring diagram for an electric engine cooling fan system, filed as "2000_coolingfan" in a 1997 Mercury Cougar owner's gallery. It shows two battery junction box feeds that are hot at all times: fuse/breaker position 17 (30A circuit breaker, page 13-6) feeding circuit 1155 YE/BK, and position 13 (50A, page 13-1) feeding circuit 1153 RD/BK. A PCM Power Relay in the Relay Center (pins 30/87, hot in Start or Run) supplies circuit 361 RD through splice S116 to both the Cooling Fan Low Relay (pins 30, 85, 86, 87, 87A) and the Cooling Fan High Relay in the High Current Relay Center (pins 1, 2, 3, 5, 6). The Powertrain Control Module (connector C185, pins 28 and 46, solid state) grounds circuit 229 RD/OG or 228 DB to energize either relay; relay outputs 639 LG/VT (through connectors C103F/C103M) and 638 OG/LB feed the two-speed Cooling Fan motor at connector C109. The fan grounds through circuit 57 BK at G102 (grounds shown on pages 10-2, 10-3). Callouts explain that the relays direct voltage to operate the fan and that the PCM grounds either relay when fan operation is required.

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Frequently asked questions

What fuses or circuit breakers power the cooling fan circuit in this diagram?: Two Battery Junction Box feeds that are hot at all times: position 17, a 30A circuit breaker (page 13-6) feeding circuit 1155 YE/BK, and position 13, a 50A fuse (page 13-1) feeding circuit 1153 RD/BK.
How does the PCM control the cooling fan?: Per the diagram's callout, when the PCM determines fan operation is required it grounds either the Cooling Fan Low Relay (via circuit 228 DB) or the Cooling Fan High Relay (via circuit 229 RD/OG) to turn on the Cooling Fan Motor. The PCM connects at connector C185, pins 28 and 46 (solid state).
What wire colors feed the cooling fan motor?: The fan motor at connector C109 is fed by circuit 639 LG/VT (light green/violet) from the low relay through C103F/C103M, and circuit 638 OG/LB (orange/light blue) from the high relay. Ground is circuit 57 BK to G102.
What supplies power to the cooling fan relay coils?: The PCM Power Relay in the Relay Center (pins 30 and 87), hot in Start or Run, feeds circuit 361 RD through splice S116 to both the Cooling Fan Low Relay and the Cooling Fan High Relay.
Where are the ground and engine control details referenced?: The diagram references Engine Controls on pages 23-2, 23-8, 24-1, 24-2 and 24-6, and Grounds on pages 10-2 and 10-3 (ground point G102).