Electric radiator fan is not comming on when its supposed to and I am over heating. He problem.

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, March 17th, 2012 AT 12:38 AM

9 Replies

Tiny
RASMATAZ
  • MEMBER
Check the fan relay and the computer controlled circuit of the fan relays
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Saturday, March 17th, 2012 AT 12:49 AM
Tiny
SATURNTECH9
  • EXPERT
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, March 17th, 2012 AT 1:10 AM
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, March 17th, 2012 AT 2:22 AM
Tiny
SATURNTECH9
  • EXPERT
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, March 17th, 2012 AT 2:28 AM
Tiny
IANJBOOTH
  • MEMBER
The sensor was purchased and installed by a local repair shop. If you have the right part numbers I can buy them at the GM dealer and install them my self.
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Saturday, March 17th, 2012 AT 2:44 AM
Tiny
SATURNTECH9
  • EXPERT
Thats pretty sad a repair shop replaced the wrong one. You can buy the sensors at auto zone the sensors have a high failure to begin with.I have a 1999 saturn SL2 and I have owned since 2006 and iam on my 4th sensor. The bottom coolant temp tells the computer what temp the coolant is so it can turn the fan on at the correct temp. Also those sensors crack and leak the sensors up untill about 2000-2001 the tips were made of plastic that went into the coolant. The plastic tips cracked and leaked coolant into the connector corroding the terminals in side the connector. Thats why I asked you to check and see if the terminals are a different color other then silver. That would mean they were corroded. You should be able to get both sensors from auto zone. Just make sure you put them in the correct place each sensor or you will cause issues. Make sure the sensors you get have brass tips where they go into the coolant. Let me know what you find and how it works for you.
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Saturday, March 17th, 2012 AT 3:04 AM
Tiny
FIXITMR
  • MEMBER
Hey ST9 my 98 SL2 does it have the same crappy sensors? It's got about 120k is it time to do the timing belt?
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Saturday, March 17th, 2012 AT 3:48 AM
Tiny
SATURNTECH9
  • EXPERT
They used the plastic tipped sensors untill 2000-2001 in the S model saturns. In 1996 S model saturns they went from two coolant sensor to one so you have one sensor. The sensors are only 10-11 so there cheap just to change as maintance item. It very well could have a plastic tipped sensor in it. Also make sure the connector going to it that the terminals arent blue or green instead of silver meaning there corroded. Other wise you will have to replace the connector as well. As far as the timing belt all the S model saturn engines use a timing chain. So if the chain isnt making noise then there is no need to replace the chain. My 1999 SL2 has 226,000 miles in it and the chain is still isnt making noise.
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Saturday, March 17th, 2012 AT 4:06 AM
Tiny
FIXITMR
  • MEMBER
Great. Thanks
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Saturday, March 17th, 2012 AT 5:58 AM

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