Question about 1999 Saturn SL

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How to replace coolant heat sensor on 1998 saturn

Location and how do I replace the coolant heat sensor on a 1998 saturn SL2

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The coolant temp sensor is located on the right side of the cyl head its small under by the upper rad hose 13mm socket removes it after u take the small connector of,make sure the car is cold coolant will come out when u remove it,,,,check the connector too for corrosion,by only saturn sensor the cheap autozone and aftermarket ones dont read right and give you the same problem as the old bad one

Posted on Oct 04, 2009

  • barry rothweiler Jul 08, 2012

    this was a great help.... i asked 3, 4 people and everyone told me something different. this was the correct solution and took about 5 minutes to complete. thank you

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1 Answer

Location of engine coolant temp sensor on 1995 saturn sl


On my daughters sl2 it is on the driver side. A note though, there are 2. Crazy i know, one above the other. One goes to the guage and one to the computer. When my son had the car it would not stay running at idol, had to rev the engine to keep it going. The engine would shake hard too, what through me was the guage in the care read fine but once i found the sensors the one looked fine the other looked like it split in half. Hope that helps

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My 1998 saturn sl2 overheated temp gauge was only on half mark and its only 9 degrees outside heater never warmed up


Check your coolant level. Most causes of no heat are low coolant levels or blocked heater cores. If it overheated and has no heat I'll beat its a low coolant level. Check for leaks. Just because the gauge didn't go all the way up doesn't mean much. Those cars trap air in the cooling systems when the level gets low. That will cause those problems. Check for leaks and if a repair is made I also recommend a termistat.

Jan 11, 2011 | 1998 Saturn SL

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On a 1998 saturn sl2, i am trying to find the coolant temp sensor?


The engine coolant temperature sensor is mounted in a coolant passage located in the cylinder head.
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Oct 17, 2010 | 1998 Saturn SL

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Searching for location of the (rear) oxygen sensor in a 1998 saturn sl2. Have already located the(front) sensor at the exhaust manifold.


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Mar 13, 2010 | Saturn SL2 Cars & Trucks

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Replaced water pump, alternator, radiator, crank sensor and no coolant leaks and car has antifreeze, but why is low coolant dashboard indicator light keep flashing on 97 saturn sl2


Inside the coolant reserve tank there is a sensor for coolant level.


Over time,this sensor can get stick.


Inspect the coolant reserve tank for crack or leak.

Locate the coolant level switch/sensor and soak it in clean warm water.

Make sure it's free to move up and down the float path.

Top off the coolant tank with coolant only.



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1 Answer

Cant find temp sensor on 1992 saturn sl2 need to change


On the SL2 (DOHC), there are two coolant temperature sensors located on the left-hand side of the cylinder head, near the upper coolant hose. On the SL2, the upper sensor with ONE WIRE controls the temperature gauge in the dash. The lower sensor with TWO wires provides input to the computer. They are not interchangeable. Here is a tip you will need a 14mm deep socket or box wrench. The new sensor may require a 13mm socket or wrench, depending on the manufacturer. Good luck and hope this helps. Keep me posted.

Jul 12, 2009 | 1992 Saturn SL2

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