Author Topic: Overheat warning light  (Read 457 times)

June 10, 2017, 08:38:06 AM
Read 457 times

Konni

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My 2010 XT recently lit up the temperature warning light. Stopped. Engine bay felt hotter than usual. Lots of gurgling noises in the pipes. Coolant level good. Started up and drove 200m. Light went off and has been ok since. What should I do? What's the most likely problem?

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June 10, 2017, 11:41:11 AM
Reply #1

Speedy

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What were the conditions? Traffic? High temp? Towing etc?



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June 10, 2017, 08:14:25 PM
Reply #2

Konni

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No traffic. Slow drive. Towing an unloaded car trailer for 15 minutes. Cool weather. Certainly no strain on engine.

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June 12, 2017, 11:49:01 AM
Reply #3

thebus

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You may have an air bubble in the system, easy to bleed out.
Else, how old is oil?
Do you have coolant in  your system or just water? May need to top up coolant as it has heat transfer properties that are required.
Is your radiator clean?
Cape Town

June 12, 2017, 09:37:48 PM
Reply #4

Konni

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You may have an air bubble in the system, easy to bleed out.
Else, how old is oil?
Do you have coolant in  your system or just water? May need to top up coolant as it has heat transfer properties that are required.
Is your radiator clean?
Full service 1000kms ago. Coolant mixture correct and level good. Changing thermostat tomorrow.

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June 13, 2017, 12:50:59 PM
Reply #5

sav

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heat transfer properties that are required.

Care to elaborate?
2007 XT Premium Sportshift (Decat, VF48 @ 1.2 bar, STi TMIC, Chett tjooned, BBK, coilovers, etc etc eish!)

May the Forester be with you...

June 13, 2017, 02:13:31 PM
Reply #6

thebus

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Water absorbs the heat and dissipates it in Radiator. Coolant (Glycol) allows for higher boiling point, less steam and less evaporation and has some heat transfer properties (absorbs and dissipates).

Water wetter is an interesting topic to look into.
« Last Edit: June 13, 2017, 02:15:30 PM by thebus »
Cape Town

June 13, 2017, 02:25:41 PM
Reply #7

sav

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Water absorbs the heat and dissipates it in Radiator. Coolant (Glycol) allows for higher boiling point, less steam and less evaporation and has some heat transfer properties (absorbs and dissipates).

Water wetter is an interesting topic to look into.

Yep, water is excellent at transferring heat, glycol is not which is why we mix the two. The only benefit of glycol is its anti corrosion properties as well as "increasing" the boiling point and lowering the freezing point. You don't need glycol in your cooling system for it to be effective.
2007 XT Premium Sportshift (Decat, VF48 @ 1.2 bar, STi TMIC, Chett tjooned, BBK, coilovers, etc etc eish!)

May the Forester be with you...

June 14, 2017, 12:21:29 PM
Reply #8

thebus

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Another 2 topics I found interesting was Copper vs Alu radiator and then the 2 pass radiators.
All of this is a science in itself.

Then you get back street mechanics who open, clean, and reassemble radiators without issue.
Cape Town

June 14, 2017, 05:01:06 PM
Reply #9

Bravofox

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Hopefully not a Head Gasket Issue, but apart from the thermostat, take a look at your radiator caps. The one on the radiator and the one on the tank above the turbo.
2015 Outback 3.6R-S
2006 Impreza 2.0R Wagon.
-ex -2009 SH XT A/T
-ex- 2009 SG9 XT Premium Manual
-ex- 2006 Impreza 2.0R Manual
-ex- 2002 Legacy 2.5GX A/T

June 17, 2017, 02:04:00 PM
Reply #10

Whirly

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Hopefully not a Head Gasket Issue, but apart from the thermostat, take a look at your radiator caps. The one on the radiator and the one on the tank above the turbo.
And the right way around!

I also did the funnel bleed method on top of the black reservoir.

And new thermostat.


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