Tempo L4-122 2.0L DSL (1984)
Relays and Modules - HVAC: Customer Interest
A/C Compressor - Clutch Slippage
AIR CONDITIONING - COMPRESSOR CLUTCH
Article No.
SLIPPAGE - PULLEY AND HUB WEAR
87-20-7
FORD:
1984-85 TEMPO
LINCOLN-MERCURY: 1984-85 TOPAZ
Figure 24
This TSB article is being republished in its entirety to correct the service procedure and the position of the relay on the fender splash shield, Figure 24.
The old position may allow moisture to enter the relay.
ISSUE:
Compressor clutch slippage may result from high system pressures or low supply voltage to the clutch field coil. This condition will cause
pulley and hub wear.
ACTION:
To correct this, install a new jumper wire harness and relay using the following procedure.
1.
Check compressor clutch for damage and replace as needed. Refer to the 1984 or 1985 Car Shop Manual, Section 36-39-3.
2.
Check voltage, using Rotunda DVOM 007- 00001, at clutch coil connector (black wire with yellow hash) and find out which of the following
voltages exist.
NOTE:
All voltage checks MUST be performed under these conditions:
*
Engine running.
*
Headlamps on.
*
A/C set to Maximum with blower on high.
*
Wait five (5) minutes.
a.
No Voltage - Disconnect wire connector from clutch cycling pressure switch at top of accumulator/drier. Connect a jumper wire across harness
connector contacts and recheck for voltage at field coil. If there is still no voltage, remove jumper wire and reconnect harness connector to cycling
pressure switch. Refer to the appropriate Electrical Vacuum Troubleshooting Manual (EVTM) for compressor clutch circuit and cooling fan
controller diagnosis.
b.
Voltage OK (Above 10.5 Volts) - Check clutch air gap using the appropriate Car Shop Manual, Section 36-39-4, Steps 6 and 7.
NOTE:
Compressor and engine must be cooled down prior to check by hand.
