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2006 Subaru tribecca 3.0L runs hot when under stress (like…

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2006 Subaru tribecca 3.0L runs...
2006 Subaru tribecca 3.0L runs hot when under stress (like going up a hill). runs at idle and normal driving without an problem. New thermostat, head gaskets, all oem. Fans do come on. Possible cause?
Submitted: 11 months ago.Category: Subaru
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Answered in 11 minutes by:
9/7/2017
Subaru Mechanic: Mike V., Subaru Technician replied 11 months ago
Mike V.
Mike V., Subaru Technician
Category: Subaru
Satisfied Customers: 27,801
Experience: Certified Subaru Technician, factory trained by Subaru.
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Thank you for your question!
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Customer reply replied 11 months ago
Ok
Subaru Mechanic: Mike V., Subaru Technician replied 11 months ago

The only thing I can think of that may cause this would be air in the cooling system. Especially with all the work that has been done. Get the front of the car up on ramps and then run it at high rpms until you get heat out of the heater. Turn it off and add some coolant to the radiator. If you have a spill proof funnel this works best. Air gets trapped in the heater core on these so they have to be bled like this. Do this a couple time or until you have good heat at idle.

That usually indicates the air is gone.

Please let me know if there is anything else I can do to help.
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Customer reply replied 11 months ago
No air in the cooling system
Subaru Mechanic: Mike V., Subaru Technician replied 11 months ago

hm, ok, that's all I have so I will open this back up to the other experts.

Sorry I couldn't help.

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Subaru Mechanic: sprinkles08, ASE Certified Technician replied 11 months ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Subaru
Satisfied Customers: 24,232
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
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Hello and welcome to JustAnswer!

It sounds as if you have a radiator issue. If the engine runs normal temperature until under heavier load that is indicative of the radiator being restricted and not being able to keep up with demand. When cores become restricted it effectively reduces the size of the radiator, lowering it's efficiency and heat transfer capability, so it won't keep up when the engine is producing more heat under load. If the system is staying full and it only overheats under load then I would recommend replacing the radiator.

I hope that helps! My goal is your satisfaction today. If you feel I've been professional and helpful, your 5-star rating at this time is most appreciated. However, if you still need my help you can reply back here and I'll respond as soon as possible! Thank you!

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Customer reply replied 11 months ago
Radiator may be new, I will check and get back to you Monday
Subaru Mechanic: sprinkles08, ASE Certified Technician replied 11 months ago

Ok.

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Customer reply replied 11 months ago
Radiator is new also
Subaru Mechanic: sprinkles08, ASE Certified Technician replied 11 months ago

What was the part number?

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Customer reply replied 11 months ago
I ordered it from performance radiator, why, should it be OEM?
Customer reply replied 11 months ago
All other part used were oem except the radiator
Subaru Mechanic: sprinkles08, ASE Certified Technician replied 11 months ago

You can try replacing the water pump if you believe you've ruled out the rest of the cooling system.

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Customer reply replied 11 months ago
Water pump is new, oem
Subaru Mechanic: sprinkles08, ASE Certified Technician replied 11 months ago

Is there any other necessary information that was omitted when the question was posted?

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Customer reply replied 11 months ago
To recap: new tstat, radiator and cap, cylinder heads machined new gaskets installed, new water pump, new spark plugs. Problem started with overheating, head gaskets breached as a result
Subaru Mechanic: sprinkles08, ASE Certified Technician replied 11 months ago

Can you get the part number for the radiator?

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Customer reply replied 11 months ago
In the morning, yes
Subaru Mechanic: sprinkles08, ASE Certified Technician replied 11 months ago

Ok.

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Customer reply replied 11 months ago
2379 part number from performance radiator
Subaru Mechanic: sprinkles08, ASE Certified Technician replied 11 months ago

I'll get back to you as quickly as I can.

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Customer reply replied 11 months ago
ok
Subaru Mechanic: sprinkles08, ASE Certified Technician replied 11 months ago

How is the cooling system being bled?

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Customer reply replied 11 months ago
I will check tomorrow morning
Subaru Mechanic: sprinkles08, ASE Certified Technician replied 11 months ago

Ok.

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