Cooling fan not working

Tiny
ERIC GAUCH
  • MEMBER
Ok, I have checked to see that the coolant level is at the seem in the resivor, the coolant sensor has been conected. I noticed that the temp gauge is at approx. 1/4 gauge and climbing, the temp warning light is flashing and the cooling fan is still not coming on?
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
SATURNTECH9
  • MEMBER
Let it idle the fan will come on at about just over half way on the gauge. Let me know if it come's on. Also check your back up light fuse in your under hood fuse box.
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
KATHRYNCOOK
  • MEMBER
  • 1997 SATURN SL2
  • 4 CYL
  • AUTOMATIC
  • 124,000 MILES
If I have ac on fan kicks in - if it is idling and gets slightly above 1/2 the coolant spews out. The fan doesn't kick in in heat nor defrost
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
ERIC GAUCH
  • MEMBER
Ok, the cooling fan came on between 1/2 and 3/4 on the gauge. I checked the back up lamp fuse and its hot on both sides. The warning lamp continues to flash in the cluster. Yet the coolant is at the seem in the resivor?
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
2CEXPT
  • EXPERT
Check the engine coolant temperature sensor-on rear of engine
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
SATURNTECH9
  • MEMBER
Ok your fan is working correctly now your going to have pop up your coolant bottle and unplug the connector to it then use a wire to jump the two terminal's together and start your car and see if your light turn's off.
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
KATHRYNCOOK
  • MEMBER
Explain rear engine? I was told it had something to do with the computer?
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
FUDZ073
  • MEMBER
  • 1997 SATURN SL2
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 160,000 MILES
My '97 Saturn SL2 has been overheating lately. I checked the coolant levels and they seem to be fine. I then looked the cooling fan. It doesn't want to turn on. I checked the fan motor and the fuse box. The motor works and all the fuses are intact. I am convinced the radiator is not clogged since the car doesn't overheat when it's moving. What could be the problem?
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
SATURNTECH9
  • MEMBER
How high does the temp gauge go up too when its overheating?Also u said the fan doesnt work but then u said u checked it and it work does the engine cooling fan come on when u turn the a/c on?
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
TONER
  • MEMBER
  • 2000 SATURN SL2
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 115,000 MILES
I have a 2000 Saturn SL2 and recently in stop and go traffic we saw steam coming from under the passenger side of the hood and saw it coming from the coolant cap on the expansion tank and the temp gauge was about halfway (it is ALWAYS at 1/4 when driving/stopped).

I changed the bottle and cap with new OEM parts, still having the same problem, so I changed the Thermostat and temp sensor (brass tipped) and the temp gauge is still going up. I also swapped the relay with the horn relay since they are the same # and the horn still works using the fan relay.

The cooling fan only comes on with the AC on, when switched off the fan turns off. I haven't let it go above 1/2 way on the temp gauge since I am afraid to do so. For the 6 years I have owned this vehicle the gauge has NEVER gone over 1/4, even when I lived in AZ for 3 years.

I have never noticed/heard the fan before since everything has been working, but when the temp gets past 1/4 and I turn the AC on the temp gauge goes down, so there must be a fan issue.

The only 2 other things I can think of are the PCM or the fan motor itself, but it works with the AC on!

Thanks in advance for any help!
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
SATURNTECH9
  • MEMBER
Let the car idle and see if the fan come's on just past half way on the gauge that's where the fan should come on in that yr and model. You probably had a bad temp senor and that's why it boiled over because the coolant temp was really much hotter then half way on the gauge. If you had a good cap before you changed it it shouldn't have boiled over till the gauge read into the red. Just over half way on the gauge is 222-226 degree's that's when the fan come's on in that yr and model saturn S model. Let me know what you find.
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
TONER
  • MEMBER
Ok, I will test it further in the morning and post back, it's just NEVER gone above 1/4 on the temp gauge, I don't understand. Thanks!
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Saturday, January 12th, 2019 AT 12:26 PM (Merged)
Tiny
SATURNTECH9
  • MEMBER
If your car never got above 1/4 on the gauge you had a problem with your thermostat sticking open. When the car sits and idle's the gauge will rise to just above 1/2 way then the fan come's on.I'm glad you changed the thermostat sound's like you really needed a new one.
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Saturday, January 12th, 2019 AT 12:27 PM (Merged)
Tiny
TONER
  • MEMBER
Everything is working. The fan comes on about a 1/5 of the way between the 1/2 and 3/4 marks, and the fan goes off once it drops below the halfway mark. Sitting in the driveway after the fan goes off a few minutes later the gauge goes back up and the fan comes back on.

So as of right now, a new thermostat, temp sensor and a new cap and everything is working.

Just have to get used to the temp gauge being around 1/2 now (the right reading) since you said it was around 1/4 due to a stuck thermostat.

So I'm thinking the stuck thermostat must have also got stuck closed, restricting coolant flow, for the vehicle to lose coolant out of the cap? When the vehicle originally did this, I replaced the bottle and cap, then it did it again, that's when I changed the thermostat, temp sensor and cap (again). Unless the temp sensor was also bad, but the gauge did work. Just trying to understand what caused the overheating/coolant loss. The coolant level when cold has always been correct (check my vehicles every week especially when I was living in AZ).

Thanks for the help!
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Saturday, January 12th, 2019 AT 12:27 PM (Merged)
Tiny
SATURNTECH9
  • MEMBER
I have never seen a thermostat stick closed they always stick open that's why the car stayed at a 1/4 on the temp gauge. Most of the time what cause's the car's to over heat is the coolant temp sensor. So my guess is the coolant temp sensor caused the boil over. Sounds like everything is working great now glad to hear it.
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Saturday, January 12th, 2019 AT 12:27 PM (Merged)
Tiny
IANJBOOTH
  • MEMBER
  • 1995 SATURN SL2
  • 111,000 MILES
The temp sensor and fuse have been replaced and the fan still only comes on intermittently. Where else should we look.

Thanks
Ian
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Saturday, January 12th, 2019 AT 12:27 PM (Merged)
Tiny
2CEXPT
  • EXPERT
Check the fan relay and the computer controlled circuit of the fan relays
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Saturday, January 12th, 2019 AT 12:27 PM (Merged)
Tiny
SATURNTECH9
  • MEMBER
Just to add to this one which coolant temp sensor did you replace the top one with one wire going to it?Or the bottom one with two wires going to it?Also does the radiator fan come on with the a/c if the a/c works?The fan doesnt come untill 3/4 on the temp gauge sometimes even the tip of the red if you have a bad sensor or temp gauge How do you know its overheating?
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Saturday, January 12th, 2019 AT 12:27 PM (Merged)
Tiny
IANJBOOTH
  • MEMBER
It was the top sensor with one wire that was replaced. The car has no a/c system. The car psychically overheated with steam and vibrations.
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Saturday, January 12th, 2019 AT 12:27 PM (Merged)
Tiny
SATURNTECH9
  • MEMBER
The top sensor is for the gauge it has nothing to do with the fan. You want to replace the bottom sensor with two wires going to it. Also inspect the inside of the connector if the terminals are green or blue instead of silver you will have to replace the connector. Where did you get the sensor you replaced?Also what is the part number of it?The two sensors are different if you put the wrong one in the top the temp gauge wont work correctly.
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Saturday, January 12th, 2019 AT 12:27 PM (Merged)

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