Cooling fan not working

Tiny
SATURNTECH9
  • MEMBER
Sounds like you have a bad coolant temp sensor you have two its the bottom sensor with two wires going to it. So the fan doesn't come on when the temp gauge reaches about 3/4 on the gauge. Also if your a/c works does the fan come on with the a/c?
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
DMCCURRY
  • MEMBER
I haven't tried the air yet. When we bought the car it had no thermostat in it. I put one in but the fan doesn't come on.
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
SATURNTECH9
  • MEMBER
So the fan doesn't come on at about 3/4 on the temp gauge?Or a little past it?Try the air and let me know if it works and fan comes on with the air. Really common for the coolant temp sensors to go bad.
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
DMCCURRY
  • MEMBER
The fan doesn't come on when the air is turned on.
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
DMCCURRY
  • MEMBER
Also we ran it to 3/4 and a little past and it still didn't come on.
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
MIKE4315
  • MEMBER
  • 1993 SATURN SL2
  • 4 CYL
  • 2WD
  • MANUAL
  • 45,000 MILES
The fan does not turn on when the temperature guage goes beyond the half way point. The car overheats in stop and go traffic.
I can turn on the cooling fan by turning on the air conditioner.
The temperature guage works fine.
I checked the connector to the coolant temperature sensor - Got 5 volts, as advertised.
Replaced the temperature sensor (without checking it first).
Once the fan is turned on by starting the A/C, it will stay on until the temperature guage reads below the halfway point.
The problem still remains. Is it possible that the PCM needs to be reset? How can I do this?
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
SATURNTECH9
  • MEMBER
First of all on your model car the fan will not come on by itself until at least 3/4 on the gauge unless your car has something wrong with the gauge. Only the newer saturn's fan came on just over the 1/2 way mark. If your car over heat's in stop and go traffic and your cooling fan work's then I suspect you have a clogged up radiator fin's from sand fur bag etc not pulling enough air threw it. Or you have a missing air dam it's spring loaded and hang's down below your a/c condensor it directs air up into your radiator.
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
SATURNTECH9
  • MEMBER
Does the a/c clutch kick on when you turn the a/c on?If so and radiator fan doesn't come on then more then likely you have a bad fan motor. See if you have power and ground to the motor with the a/c clutch kicked in. The wire with a red tracer should have power and the solid black one is ground. If you doing then you have a bad fan motor. Let me know what you find.
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
DMCCURRY
  • MEMBER
The fan is hard wired on all the time, it works. It just doesn't turn off and on like it should. Also the compressor kicked on but the system needs charged.
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
SATURNTECH9
  • MEMBER
If the fan motor works you most likely have a bad coolant temp sensor its the bottom sensor with two wires going to it. Its screwed into the head right below where the upper hose goes on. Also inspect the connector going to it if its corroded replace the connector also. The sensor is only 10 I wouldnt leave it hard wired not good for the engine to never getting fully warmed up. Alos with the sensor being bad it means the engine is running too rich. When the sensor gets bad enouhh the engine wont start it could surge die while driving etc.
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
DMCCURRY
  • MEMBER
Thanks, I will give this a try and keep you updated.
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
SATURNTECH9
  • MEMBER
Cool keep me updated.
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
KURSTIN
  • MEMBER
  • 1999 SATURN SL2
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 108,000 MILES
I am not sure if my fan is suppose to be on all the time but my engine was hot and my fan did not turn on. I am trying to figure out if it could be a fuse or what it could be.
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
BLUELIGHTNIN6
  • EXPERT
Check cooling fan relay, located in underhood junction block
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
BLTS
  • MEMBER
  • 2001 SATURN SL2
Engine Cooling problem
2001 Saturn SL2 4 cyl

fan dose not turn on. Checked fan, fan works changed
relay on fuse box. Car over heats but temp gauge reads
normal.
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
SATURNTECH9
  • MEMBER
So I take it ur fan turns on when u turn on the a/c?If ur temp gauge reads normal but ur car over heats then I would say u need a new coolant temp sensor. It's screwed into ur head below where ur upper hose goes on. Make sure u check the connector going to it also they get corroded if it is corroded u will have to clean or replace it. Make sure u get a brass tip coolant sensor the plastic tip ones crack. Also since ur car has been boiling over I would replace the cap it's probably bad as well. Let me know how it goes and what u find.
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+1
Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
ERIC GAUCH
  • MEMBER
  • 1997 SATURN SL2
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 205,000 MILES
Over heating warning light on consistantly. Cooling fan was not running. Replaced coolant temp sensor. Cool fan is still not running. But is running with coolant tem. Sensor discounted. HELP! Is my car possessed. It is Halloween. Scary. LOL
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
SATURNTECH9
  • MEMBER
When you replaced the coolant temp sensor did you inspect the coolant temp sensor for being corroded?If it's corroded you have to replace the connector. Also you said your overheating light flashes how high is your temp gauge getting?Have you checked your coolant level?If it's low that light will flash. Let me know what you find.
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
ERIC GAUCH
  • MEMBER
The coolant temp sensor has been replaced and there is no corosion on the connector. Whats interesting is the cooling fan will run continuosly with the temp. Sensor disconnected. The coolant level appears to be where it needs to be. The coolant temp. Warning indicator is flashing on the instument cluster. I started diagnosing the problem as a inop. Cooling fan and by the tree it points to the PCM being the problem, I'm not a 100% sold on this being the problem area? Any ideas? Thank you
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
SATURNTECH9
  • MEMBER
If you unplug the coolant temp sensor then the fan will run all the time the computer goes into a fail safe mode to protect the engine from overheating by running the fan all time. Fill the coolant bottle up to the seam of the bottle and see if light turn's off. Also if you let the car idle with the sensor plugged in what temp on the gauge does the fan come on at?
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)

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