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Engine runs cool going down the road but heats up during idle in parking lot

Tiny
DROID0789
  • MEMBER
  • 1996 SATURN SL2
  • 210,000 MILES
If I'm going down the road the temp gauge drops down just above the first mark, but if I sit for a period of time idling it warms up to the second mark, but then drops right back off as I start moving again
Sunday, November 13th, 2011 AT 10:23 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test the thermostat and coolant temperature sensor-Are you overheating?
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Tuesday, January 22nd, 2019 AT 11:36 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
The half way mark is where it normally runs what is your concern?
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Tuesday, January 22nd, 2019 AT 11:36 AM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Also does your ac work?If so turn it on does the radaitor fan come on with the ac?If so then you could have a coolant temp sensor miss reading too low of actual temp. Its really common for the sensors to fail on those cars. Also it only has one sensor so even if it did overheat because of the sensor it wouldnt show on the gauge.
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Tuesday, January 22nd, 2019 AT 11:36 AM

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