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sprinkles08
sprinkles08, ASE Certified Technician
Category: Subaru
Satisfied Customers: 23099
Experience:  ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
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2006 Subaru tribecca 3.0L runs hot when under stress (like

Customer Question

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: 1 month ago.
Category: Subaru
Expert:  Mike V. replied 1 month ago.

Thank you for your question!
My name is ***** ***** give me a moment to review your question and type my reply. Thanks

Customer: replied 1 month ago.
Ok
Expert:  Mike V. replied 1 month 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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Thank you so much!

Customer: replied 1 month ago.
No air in the cooling system
Expert:  Mike V. replied 1 month ago.

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

Sorry I couldn't help.

Expert:  sprinkles08 replied 1 month ago.

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!

Customer: replied 1 month ago.
Radiator may be new, I will check and get back to you Monday
Expert:  sprinkles08 replied 1 month ago.

Ok.

Customer: replied 1 month ago.
Radiator is new also
Expert:  sprinkles08 replied 1 month ago.

What was the part number?

Customer: replied 1 month ago.
I ordered it from performance radiator, why, should it be OEM?
Customer: replied 1 month ago.
All other part used were oem except the radiator
Expert:  sprinkles08 replied 1 month ago.

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

Customer: replied 1 month ago.
Water pump is new, oem
Expert:  sprinkles08 replied 1 month ago.

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

Customer: replied 1 month 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
Expert:  sprinkles08 replied 1 month ago.

Can you get the part number for the radiator?

Customer: replied 1 month ago.
In the morning, yes
Expert:  sprinkles08 replied 1 month ago.

Ok.

Customer: replied 1 month ago.
2379 part number from performance radiator
Expert:  sprinkles08 replied 1 month ago.

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

Customer: replied 1 month ago.
ok
Expert:  sprinkles08 replied 1 month ago.

How is the cooling system being bled?

Customer: replied 28 days ago.
I will check tomorrow morning
Expert:  sprinkles08 replied 28 days ago.

Ok.