A/C Fan Controller - New Diagnostic Procedure
89ford32AIR CONDITIONING - FAN CONTROLLER - DIAGNOSTIC
PROCEDURE
Article No. 89-20-3
FORD: 1987-90 ESCORT 1988-90 TEMPO
LINCOLN-MERCURY: 1988-90 TOPAZ
ISSUE: Replacing the A/C fan controller may not correct cooling fan or other air conditioning electrical system malfunctions.
ACTION: If an inoperative A/C cooling fan is found, use the following fan controller and A/C electrical system diagnostic chart and the appropriate Electrical And Vacuum Troubleshooting Manual (EVTM) to resolve the concern before replacing the A/C fan controller.
NOTE: THE REPLACEMENT PARTS HAVE INTERNAL CIRCUIT PROTECTION. WHEN THE NEW CONTROLLERS ARE USED TO SERVICE THESE VEHICLES, TERMINALS # 2 AND # 4 ARE NOT USED. THESE TWO TERMINALS ARE USED ONLY FOR CONTROLLERS PRIOR TO THE 1987 ESCORT AND THE 1988 TEMPO/TOPAZ.
The following points should be kept in mind when checking the A/C circuits.
1. Voltage must be available at fan controller pin # 3 for A/C operation.
2. The A/C clutch coil current must not exceed 6 amps.
3. If voltage or ground is not available at the controller, use a jumper wire to supply the proper voltage or ground to check fault or proper operation of the cooling fan A/C system.
4. Check for voltage at the controller with:
a. The connector plugged into the controller.
b. The key in the "RUN" position, except where an exception is noted.
5. If there is intermittent A/C operation, check for the following items at the cooling fan, coolant switch splices and connector/terminals:
^ Breaks
^ Poor crimps
^ Loose terminals
If the A/C fan controller must be replaced, refer to the appropriate Car Shop Manual, Section 36-20 for service details.
FAN CONTROLLER AND A/C ELECTRICAL SYSTEM DIAGNOSTIC CHART
PART NUMBER PART NAME CLASS
E8FZ-8B658-A Fan Controller (Escort) B
E93Z-8B658-A Fan Controller (Tempo/Topaz) B
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Eligible Under Basic Warranty Coverage
OPERATION DESCRIPTION TIME
892003A Diagnosis Time 0.5 Hr.
DEALER CODING
BASIC PART NO. CONDITION CODE
8B658 42
OASIS CODES: 2610, 2770, 4300, 4301