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Old 06-08-2013, 01:47 PM   #1
bottledbird68
Scooby Specialist
 
Member#: 119373
Join Date: Jul 2006
Chapter/Region: NESIC
Location: Clinton MA
Vehicle:
2002 WRX
black

Default Coolant temp gauge reading high, not overheating though

So, after having some issues we finally got our 02 wrx running again, but, now when it starts to warm up within 10-15 minutes of idling the coolant temp gauge climbs right up into the overheating zone. However the cooling fans weren't kicking on.
So, put a mechanical temp probe into the reservoir on the motor where the radiator cap goes. When cluster gauge is 2/3 of the way to pinned coolan temp is 160 degrees. I let the factory gauge pin itself and watched the mechanical one. As soon as actual coolant temp hit 210 the fans kicked right on.
Any idea what could make the gauge read off? I checked the wire at the cluster that grounds the gauge and continuity is good. Also checked power in and it has 12 volts. I'm assuming the sensor is ok cause a. It's brand new, and b. the fans come on at 210.
Also, not sure if or how they could be related but the pink sti logo no longer lights up. Car has an 05 sti cluster that has worked flawlessly for 3 years now. And yes I also tried putting the stock cluster back in and the temp gauge does the same thing with the factory cluster so its not a cluster issue.
Please help. I'm lost here.
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Old 03-07-2015, 10:45 PM   #2
Derekshep
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Member#: 398185
Join Date: Aug 2014
Location: Kentucky
Vehicle:
02 Wrx
Blue

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I know this is a very old thread but did you ever get this fixed. I'm having same problem
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Old 03-07-2015, 11:19 PM   #3
bottledbird68
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Member#: 119373
Join Date: Jul 2006
Chapter/Region: NESIC
Location: Clinton MA
Vehicle:
2002 WRX
black

Default

No worries at all. On this one we were trying to diagnose a driveability issue so I put a new coolant temp sensor in it from autozone.
I swapped the old oem one back in and problem solved. The aftermarket one was junk right out of the box. Hope that helps. I know how frustrating it can be!
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Old 03-08-2015, 09:48 AM   #4
Derekshep
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Member#: 398185
Join Date: Aug 2014
Location: Kentucky
Vehicle:
02 Wrx
Blue

Default Coolant temp gauge reading high, not overheating though

Thanks man. I put two different new ones from autozone in and they both doing the same. Sadly I don't have the oem anymore
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