Fig. 2: Identifying A/C Relay Terminals
Courtesy of MAZDA MOTORS CORP.
CONDENSER FAN RELAY
Remove condenser fan relay. Check continuity between indicated relay terminals. See CONDENSER FAN
RELAY TEST table. See Fig. 3 . If continuity is not as specified, replace relay.
CONDENSER FAN RELAY TEST
Test Between TerminalsContinuity
"A" & "B"(1) Yes
"C" & "E"(1) No
"C" & "F"(1) Yes
"C" & "E"(2) Yes
(1)With no voltage applied.
(2)With battery voltage applied to terminals "A" and "B".
1997 Mazda MX-5 Miata
A/C-HEATER SYSTEM - MANUAL 1997 Manual A/C-Heater System
Microsoft
Sunday, July 05, 2009 1:41:48 PMPage 5 © 2005 Mitchell Repair Information Company, LLC.
Fig. 3: Identifying Condenser Fan Relay Terminals
Courtesy of MAZDA MOTORS CORP.
CONDENSER FAN MOTOR
Disconnect condenser fan motor connector. Connect positive battery lead to condenser fan motor Black/Yellow
wire terminal, and ground Black wire terminal. Replace condenser fan motor if it does not operate.
EVAPORATOR THERMOSWITCH
1. Remove glove box. Operate engine at idle. Turn A/C off. Turn blower switch to 4th position (high) for a
few minutes to ensure evaporator temperature is greater than 32°F (0°C). Turn blower switch and engine
off.
2. Disconnect evaporator thermoswitch connector. Check continuity between thermoswitch terminals. If
continuity exists, go to next step. If there is no continuity, replace thermoswitch.
3. Submerge thermoswitch sensing bulb in ice cold water of less than 32°F (0°C). Ensure continuity does
not exist between thermoswitch terminals. Replace thermoswitch if continuity is not as specified.
PRESSURE SWITCH
1. Turn ignition off. Connect manifold pressure gauge set to system. If high-side pressure is 37-310 psi (2.6-
22.0 kg/cm
2 ), go to next step. If pressure is not as specified, check refrigerant level.
2. Disconnect pressure switch connector. Check continuity between switch terminals. If continuity exists,
pressure switch is okay. If there is no continuity, replace pressure switch.
REMOVAL & INSTALLATION
1997 Mazda MX-5 Miata
A/C-HEATER SYSTEM - MANUAL 1997 Manual A/C-Heater System
Microsoft
Sunday, July 05, 2009 1:41:48 PMPage 6 © 2005 Mitchell Repair Information Company, LLC.
