DESCRIPTION & OPERATION
Electric cooling fan system consists of a fan and electric motor attached to the fan shroud. Engine temperature is monitored by the Engine Coolant Temperature (ECT) sensor. Fan is controlled by Constant Control Relay Module (CCRM) with inputs from Powertrain Control Module (PCM). The electric cooling fan is wired to operate only when ignition switch is in ON position and engine temperature exceeds specified temperature, or when A/C is on and vehicle speed is less than 45 MPH. See COOLING FAN OPERATING TEMPERATURES table.
During hard acceleration, the Wide Open Throttle A/C Cut-Off (WAC) relay controls the A/C clutch and cooling fan. A signal is sent to PCM and then to the CCRM, where the module de-energizes the A/C clutch and cooling fan, decreasing engine load during acceleration.
| Model | Low Speed On @ °F (°C) | High Speed On @ °F (°C) |
|---|---|---|
| Escort & Tracer | (1) 207 (97) | 221 (105) |
| (1) Operating temperature for one-speed fan models. | ||
| (1) | Operating temperature for one-speed fan models. |
COOLING FAN OPERATING TEMPERATURES
Description
Following procedures are functional tests of EEC-V system. These basic test steps must be followed in sequence to avoid misdiagnosis.
- Visual Check
- Equipment Hookup
- KOEO SELF-TEST (Key On Engine Off)
- KOER SELF-TEST (Key On Engine Running)
- Computed Timing Check
- Continuous Memory Self-Test