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If the temp gauge shows normal, you would not expect the fan to be on much. It is controlled by the coolant temp sensor. If the fan will not come on when the car gets really hot, it is possible this sensor has failed.
It is normal for both AC and cooling fans to be on when you turn on AC to cool setting.
The cooling fan is thermostatically controlled and enerised once the radiator/engine temperature exceeds that of the thermostat controlling th the fan. If the fan is coming on prior to the engine reching the operational temperature, then either the thermostat is not functioning or ha been wired incorrectly into the system the radiator was changed.`
Check the ECT (engine coolant temperature) sensor. Both the fans will ground through this sensor. If it is failed, the fans will not come on no matter how warm the engine.
Start car. Turn on a/c. check for power to the fans with meter. Remember, this is d.c.power. If power is there, fans are bad. Replace. Be sure they have a good, solid ground. If no power, look further up the circuit for where you are loosing the power.
there are actually 3 temp sensors. 1 is on the top of the engine that goes to temp gauge in dash has 1 wire. next to it is a 3 wire sensor for engine control and choke. on the bottom of the radiator next to the hose is a 2 wire sensor. loosen all 3 but leave connected. get engine hot past halfway point on dash gauge. with ac off disconnect 1 sensor at time. start with 2 wire under radiator. it takes the most abuse. fan will come on when you disconnect broken sensor. 2sensor must agree for fan to stay on till engine cools when turned off. note this is solution i used after verifying fuses, fuseable links and relays worked.WOO HOO! make sure you check both the fuse box under hood and fuse boxleft side of steering wheel my ECU fuse was inside my bros was outside.ECU B on my car goes to nothing and is under hood. Had it confused with ECU on wiring diagram.DOH!
it's hooked up to the temperature sensor. if you don't get a temp light on, the sensor might be bad. it's usually located where the upper radiator hose goes into the engine. also check your thermostat.
The Normal Temperature Range to the Fan Start is: A/C ON 181 F.
A/C OFF 199 F. When the Engine Reach this Temperature the Fan should start.
OK. Do this simple test.
1---- Start the engine, Desconnect the ECT Switch located on the Radiator,
See if the Fan come ON. If yes, if not go to step #2
Connect the ECT SWITCH and leave the car Running and with a Temperature gage.
See the temperature, if the Temperature go more than 199 F.
Turn the Engine OFF.
Disconnect the ECT sensor and check for Ground at the WHITE/BLACK wire.
If ground exist, Replace the ECT switch.
But if not. Check the wire for any damaged, and the ground at the Front Left Fender.
Repair as need.
2---- check the Fuse link RDI FAN . 30 amp.
Check the Fuse link CDS FAN 30 amp.
Replace if need.
And Return to step # 1.
Check the Radiator fan Relay, Rad fan relay 2 and 3. Replace if need.
Ok. I hope this help on your question.
I can give to you the WIRING DIAGRAM of the Fans, But I need a E-MAIL adress to do that.
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