DESCRIPTION
| Application | Engine |
|---|---|
| Continental | 3.8L |
| Sable | 3.0L & 3.8L |
| Taurus | 3.0L, 3.0L SHO & 3.8L |
| Thunderbird | 3.8L (Supercharged Only) |
1992 ELECTRIC COOLING FAN APPLICATIONS
Note. Some vehicles are equipped with an Integrated Relay Controller Module (IRCM) which is part of Ford Electronic Engine Control (EEC-IV) system. Designated diagnostic codes must exist prior to testing IRCM. For complete information on Ford EEC-IV system, see the appropriate article in the ENGINE PERFORMANCE section.
Electric cooling fan system consists of either a two-speed or one-speed fan. Two-speed fan is used on 3.0L (except SHO) and 3.8L A/T models; one-speed fan is used on Taurus 3.0L SHO.
On 3.0L A/T models, low-speed cooling fan motor operation is achieved by using a dropping resistor in series with the motor. All other models use a two-speed fan motor. Cooling fan operates only when ignition is on.
OPERATION
Cooling fan is controlled by the Integrated Relay Controller Module (IRCM) and Electronic Engine Control (EEC-IV) module. The modules energize cooling fan under the following conditions
- Engine temperature is above normal. Low-speed fan runs at 222°F (106°C) and goes off at 214°F (101°C) on Thunderbird.
- Engine temperature is above normal. Low-speed fan runs at 215°F (102°C) and goes off at 210°F (99°C) on Continental, Taurus and Sable.
- A/C is on and vehicle speed is less than 43 MPH.
- Cooling fan is turned on high speed if engine temperature is higher than desirable and fan has been operating at a low speed. Fan runs at 230°F (110°C) and goes off at 224°F (107°C). On Continental, cooling fan will operate at high speed when coolant temperature reaches 236°F (113°F) with engine idling. During hard acceleration, the Wide Open Throttle A/C Cut-Off (WAC) relay controls the A/C. A signal is sent to EEC-IV and then to the IRCM, where the module de-energizes the A/C clutch, decreasing engine load during acceleration. Several different controllers are available depending on application. Proper operation of the system cannot be obtained unless proper controller is used.