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Old 02-20-2013, 06:44 PM   #1
steven765
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Member#: 105920
Join Date: Jan 2006
Location: Somewhere in the Northeast
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2006 Baja 5 Speed

Default strange overheating issues at highway speed

So my 06 baja started running hot at 73mph on a 15 degree day! It hit 231 before I noticed. I backed off the gas, opened the windows and full bore on the cabin heat. Temps then came down into the 200's.

On the way home last night, again on the thruway this time temps would sit around 200 or so. I kept the speeds under 70.

This is on a rebuilt CCR motor, with a new oem sensor and oem thermostat. Temps were from the scangauge. When I rebuilt the motor I flushed the rad as best I could and hooked a garden hose up to the heater core, changed out everything to subaru blue with no additive. Everything has been running fine for the last 12k miles until this last week out of the blue temps seemed a few degrees higher than normal (188 vs 181).

I did run the additive before the new motor, I've been reading about it maybe plugging up the rad. Unless maybe the thermostat died in it's infancy.. maybe?
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Last edited by steven765; 02-21-2013 at 10:34 AM.
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Old 02-20-2013, 10:54 PM   #2
Smitithus
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Default

I would pressure test the cooling system. A small leak could cause an air pocket and cause the water pump to starve. Usually see it on bad head gaskets though. Fans shouldn't matter due to you being on the highway so fan switch should be fine. Maybe change your thermos anyway, its 20 bucks, takes 20 min but cheaper than over heating when it's over heating, how does the air coming from the heater feel? is it hot, or luke warm?
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Old 02-21-2013, 11:54 AM   #3
steven765
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2006 Baja 5 Speed

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After it heats up it's warm, on the highway it comes out hot. Then again it's been 10 deg F here lately.
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Old 02-26-2013, 09:36 AM   #4
Menacing_Gc8
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2001 2.5 RS
Silver

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Mine did this for 2-3 days before.my headgasket went. I would be very very careful...
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Old 02-26-2013, 01:14 PM   #5
Smitithus
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ya, I'd guess bad HG's. get a coolant tester from the parts store and test your radiator coolant for hydrocarbons and go from there.
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Old 02-27-2013, 02:49 AM   #6
steven765
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i doubt it's the heads, they're brand new multi layer gaskets. I'll check the coolant for hydrocarbon's just in case.
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Old 03-03-2013, 08:38 PM   #7
ballitch
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Wrx Tranny,slowr than ish

Default

Are you losing coolant at all? Sounds like thermostat or HG to me, but if you are losing coolant, a leak could lead to an air bubble.

I am inclined to think CCR does know how to do subaru HG's....so idk.


~Josh~
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Old 03-08-2013, 11:55 PM   #8
steven765
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so i pressure tested the radiator cap, 1psi

That's what I get for being in a hurry, almost blew a 5k motor. Stupid autozone is only good for wire, misc electrical parts and loner tools.

I put a 'new' autozone one in while I wait for the surbaru one to arrive. Temps help 180, 200 going over the mountain so about normal.
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