Mechanics

WHAT COULD IT BE IF A HAS RPM SURGING AND TEMPERATURE GAUGE THAT IS DROPPING FROM RUNNING TEMPERATURE TO COLD AND BACK UP AGAIN?

1997 Saturn SC1 • 165,000 miles

1997 saturn sc1 has rpm surging and temperature gauge that is dropping from running temperature to cold and back up again
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Carrislu
March 16, 2012.



Check and test the coolant temperature sensor, also the idle air control valve-

Refer to this link:http://www.2carpros.com/articles/engine-surges


Rasmataz
Mar 16, 2012.
Just to add to this one you need a new coolant temp sensor also inspect the inside of the coolant temp sensor connector if the terminals are green or blue instead of silver you will have to replace the connector as well.I have replaced a ton of those sensors for that issue and a lot of other issues. Its a really common issue on those cars.


Saturntech9
Mar 16, 2012.