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Air conditioning system is blend-air design. Air enters blower assembly and is directed through condenser assembly and cooled. Air passes through or around heater core to regulate output air temperature. The evaporator assembly is mounted under dash, between blower motor and heater assembly. A/C COMPRESSOR INOPERATIVE, Inspect fuses No. 18 and 38. Replace as necessary. If fuses are okay, disconnect 4-pin connector from compressor clutch relay. Measure voltage between White wire terminal and ground. Turn ignition on. If battery voltage does not exist, repair open in White wire between fuse box and compressor clutch relay. If compressor clutch does not engage, repair open in Yellow wire between clutch relay and ECU. If compressor clutch engages, substitute a known good ECU, and recheck. If compressor clutch engages, replace original ECU. CONDENSER OR RADIATOR FAN INOPERATIVE 1. Turn ignition, blower and A/C switches on. If both fans do not work, go to step 4). If either fan comes on, turn ignition off. Inspect fuses No. 32 and 15. Replace as necessary. If fuses are okay, inspect relay of inoperative fan. Replace as necessary. 2. If relay is okay, disconnect fan motor connector. Turn ignition on. Measure voltage between Blue/Black or Black/Yellow wire terminal (positive side) and Black or Blue wire terminal (negative side). If battery voltage exists, replace fan motor. Inspect fuse No. 15. Replace as necessary. If fuse is okay, turn ignition off. Disconnect dual pressure switch. Connect No. 1 Blue/Red wire to ground. See Fig. 2 . If both fans do not come on, repair open in Blue/Red wire between diode and dual pressure switch. If both fans come on, connect a jumper wire between No. 2 Blue/Red and No. 3 Blue/Red wire terminals of thermostat switch connector. If both fans come on, replace thermostat switch. If both fans do not come on, reconnect thermostat switch connector. COMPRESSOR & EITHER COOLING FAN INOPERATIVE 1. Inspect fuses No. 38, 15 and 18. Replace as necessary. If fuses are okay, disconnect dual pressure switch. Turn on blower and A/C switches. Start engine. Connect jumper wire between No. 1 Blue/Red wire terminal and ground. If compressor and both fans do not run, repair open in No. 1 Blue/Red wire between dual pressure switch and A/C diode.
Tags : thermostat switch, compressor clutch, jumper wire, c switches, fuse box, radiator fan, measure voltage, honda civic si, wire terminal, heater assembly, blower assembly, wire terminals, battery voltage, pressure switch, 1991 honda civic
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