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Old 10-08-2006, 06:58 PM   #1
cakjoey
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Default 1994 sohc cooling fan won't run unless the a\c is on

ok this one got me. when hot no fan,but fan works when diagnosic terminals a and b are jumpered, there is no trouble codes stored, sensor reads correct resistance,the relay under hood is good, FAN WILL START IF I JUMP THE SENSOR BUT THEN I GET THE SES LIGHT. IF I PLUG IN THE SENSOR WHILE THE FAN IS ON IT IMMEDIATLY SHUTS OFF, FAN RUNS IF I JUMP THE RELAY CONTACTS. "THERES POWER AT THE RELAY COIL BUT IT DOES NOT SWITCH UNLESS AC IS ON" DOES THIS HAVE ANYTHING TO WITH THE RESISTOR IN THE RELAY AND IS THERE ANOTHER RELAY HIDING SOMEWHERE. NEED SOME REAL GOOD TECH SECRETS. PLEASE HELP. HAVE SAME PROBLEM WITH FORD ESCORT,BEEN TOLD THAT THERE IS A RELAY UNDER DRIVER SIDE FENDERWELL UNDER BATTERY.
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Old 10-08-2006, 07:14 PM   #2
andy_95sl2
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Default Re: 1994 sohc cooling fan won't run unless the a\c is on

could be the resistor, but i'd replace the ECTS (engine coolant temperature sensor) before doing anything else. Its like... ~7 from the dealership, but make sure you get the brass tipped one, not the resin tipped one.
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Old 10-08-2006, 07:18 PM   #3
cakjoey
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Default Re: 1994 sohc cooling fan won't run unless the a\c is on

Think I Will Just In Case Thank You Andy
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Old 10-08-2006, 07:29 PM   #4
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Default Re: 1994 sohc cooling fan won't run unless the a\c is on

dude it's not a resistor, its a diode. And check your caps lock key.
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Old 10-08-2006, 08:25 PM   #5
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Default Re: 1994 sohc cooling fan won't run unless the a\c is on

you mean in the relay, ok
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Old 10-09-2006, 12:25 AM   #6
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Default Re: 1994 sohc cooling fan won't run unless the a\c is on

Here what GM/Saturn say about the cooiling fan operation...

The PCM controls the cooling fan motor by controlling the cooling fan relay. The PCM controls the cooling fan relay by controlling an internal driver that pulls the relay coil circuit to ground. When the relay coil circuit is pulled to ground, the switch side of the relay closes allowing current to flow to the cooling fan motor.

The PCM turns the cooling fan relay ON based on the reading from the engine coolant temperature (ECT) sensor. The ECT sensor is a thermistor that varies resistance according to changes in engine coolant temperature. The PCM supplies a 5 volt reference through a pull-up resistor to the sensor, which is connected to ground. When the sensor is cold, it has high internal resistance, high signal voltage at the PCM. As the sensor temperature increases, its resistance decreases, a low signal voltage at the PCM. The PCM uses the signal voltage to determine the engine coolant temperature.

Under normal operating conditions, the cooling fan motor operates whenever the ECT is greater than 105.5C (222F) or the A/C relay is commanded ON below 113 km/h (70 mph). The cooling fan motor will turn OFF when the temperature drops below 100C (212F). If the engine is turned OFF and the ECT is above 107C (225F), the cooling fan motor can run up to 4 minutes or run until the ECT drops below 107C (225F) with the ignition OFF.

Based on the experience that i have encountered, customers states that they don't hear a cooling fan come on and the temp gauge get hot. I have observe the these condition and i have concluded that when the gauge is reading 3/4 the way up on the temp gauge, that is when the cooling fan suppose to come on. This is a normal condition. ALso you might want to check if you have a the air deflector that is pn the bottom of you front bumper. Saturn designed the lower air deflector so that when you go down the road it will cool the radiator because if you look at the front of a S car there is not enough room to cool down the radiator. I hope this info helps you out..need any more info post me up.
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