Question about 1998 Oldsmobile Silhouette

3 Answers

Cooling fans dont engage! 1998 oldsmobile silhouette!

Cooling fans don't engage when a/c is turned on or when temp reaches 200 degrees plus. I jumped fans from battery, and they work. Check all fan relays, and their all good. Both 30 amp fuses are good. So i can only think there is a thermostat on the radiator or on one of the fans that has gone bad. where can i find them or a diagram that shows them and location. Iam just assuming at this point but there has to be a thermostat somewhere to turn the fans on and off. please help thanks! Oh and i also replaced a sensor on the thermostat housing, and it didnt help! Sigh's

Posted by greenyellowt on

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3 Answers

Ronnie Wilson

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Your Problem Can VERY WELL BE with the Temp Sensor, As It Is the First in This Electrucal Circut . it Waits for 210-230 Degree Engine temp and Gives that Sygnal to the ECM then ECM Grounds out the Cooling FAN RELAY To Turn ON the FANS and the Temp Sensor is Usualy THE #1 Culpret Closley in front of the RELAY.
There are 2 Sensors On this Vehicle The One You Replaced and One Located At Trans Side of
Engine Closer to Front of Vehicle At the Head ,Thereis a 2 wire Plug On it and This Sensor Goes to the ECT witch CONTROLS COOLING FAN RELAY. Hope this Helps and if you Need A Diagram For this It Must be Emailed as FixYa Does NOT Support Large Picture Files. My Email Add. Is MY
Screen Name Here on FixYa @aol.com

Posted on Jun 15, 2009

  • 4 more comments 
  • Geoff Gayan Aug 17, 2012

    Ron, I thinkI have the same problem and could use those diagrams, too! I tried your screen name/aol address but I keep getting failures.

  • Geoff Gayan Aug 17, 2012

    Ron, I have the same problem with my '98 Silhouette and could use those diagrams for both Temp Sensors (location and shape). Is your aol address still good? I tried contacting you but it failed.

  • Patricia Lanham
    Patricia Lanham Dec 13, 2013

    same problem fans shut off when sensor replaced

  • Patricia Lanham
    Patricia Lanham Dec 13, 2013

    continues to run hot??

  • nita mills
    nita mills May 12, 2014

    all these suggestion are fine, but I want to hear from someone that had this problem and FOUND the solution. It would be very helpful to know that someone actually figured out the problem.

  • Chris Crider
    Chris Crider Nov 10, 2018

    All relays replaced temp sensor at thermostat and bled clean of air. Fixed after two other "mechanics" completely missed the faulty radiator cap. Would spew around gasket then dry once out of coolant. They replaced everything but relays and sensor. I unplugged sensor and fans worked. Live stream data showed fans kicked in at 220F degrees.sensor is located under throttle cable control at intake behind engine hoist loop. Two wire oval plug.

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Jonah Oneal

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Coolant fan relays or coolant temperature sensor.control fan coming on.check the coolant level if low it will cause cooling fan problems.if everything check out ok.you have pcm problems.

Posted on Jun 15, 2009

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brian williams

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Coolant temp sensor issue. Run car and unplug sensor....if they activate replace sensor.

Posted on Nov 10, 2018

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