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Old 09-13-2007, 12:23 PM   #1
hrmax
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Member#: 37216
Join Date: May 2003
Chapter/Region: SWIC
Location: Chandler, AZ
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2004 STI
PSM

Unhappy Help diagnosing a probem

On the way to work today my stock coolant temperature gauge was fluctuation quite a bit and would read REALLY high. A little above half way between the top and the normal range's top mark. As soon as it got to that point I was ready to pull over but then it would drop back down to the higher end of the temperature range very quickly. It kept doing this.

My first thought was bad thermostat... but I have a Crucial 160 degree t-stat so even if it failed, it *should* fail open so it would run cold if it failed.

Second thought is that the water pump was failing... but my DEFI oil temp gauge was steady at 90 so wouldn't a smoking hot engine spike my oil temps too?

The car didn't seem to drive or act any different with the higher temp and it was fairly cool this morning too.

Anyone have any ideas?

UPDATE:It is a bad idea not to turn on the heater and allow the heater core to fill when you flush and refill your coolant system A two month old mistake that took a while to surface because it's been 150 degress outside for the last 2 months.
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Last edited by hrmax; 09-13-2007 at 05:38 PM.
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Old 09-13-2007, 12:28 PM   #2
MrMcCrackin
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sounds like an un happy fan - if everything else you described is true


find someone with a scanner and data log the event
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Old 09-13-2007, 12:31 PM   #3
hrmax
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PSM

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I have a tractix cable so I am going to log it at lunch or at least when I try to drive home. I thought fans only had a significant effect when the car was stopped, or not moving very fast? I was on the freeway and there didn't seem to be any correlation from what I could tell between RPM or speed and the fluctuations.
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Old 09-13-2007, 02:23 PM   #4
WgnWheel
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have you ever flushed the cooling system? maybe you have some air in there? i at least flush my radiator 2x a year.
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Old 09-13-2007, 02:34 PM   #5
hrmax
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I installed the new thermostat and put new coolant in about 2 months ago and haven't had any issues until today. I guess there could be a bubble now so I will check that later as well.
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Old 09-13-2007, 05:51 PM   #6
hrmax
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I pulled an Eric Green (of the AZ Cardinals) in the end zone...my bad.
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Old 09-13-2007, 05:52 PM   #7
MrMcCrackin
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comes to # 2

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^^


bawahahahahahahahahaa
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