Half a year ago.. I've been repair head gasket, thermostat and timing belt with water pump. Been driving over 10k miles until climb to overheating. Coolant box was broiling.

So, I was repair raditor cap and still not solving.

 

It's 2005 Subaru outback ej25.

Any idea which is leaky go..

Thanks

If the plastic over flow box coolant was bubbling, then your head gaskets are bad. The bubbles is hot exhaust gas leaking into the cooling system, where there is a breach in the head gasket.

If the plastic over flow box coolant was bubbling, then your head gaskets are bad. The bubbles is hot exhaust gas leaking into the cooling system, where there is a breach in the head gasket.

Yes, there bubbling in the coolant box.

I think need new bolts. Cuz I was put same old blots. That's will be cause head gasket lose?

It can "boil" for other reasons and look like exhaust gases pushing out the coolant overflow.

Did it loose fluid?
Are the fans coming on?

Is the radiator clogged?

Is the tstat failing?
(Is it an aftermarket tstat or Subaru?)  Huge difference between the two.

 

If any of those cause overheating - the coolant can boil and push out of the overflow as well. 

There's still a good chance it's the head gasket, but verify first before diving in.

 

Do not replace the head bolts.  It's pointless on Subaru's, they are not the type of bolt you replace and entirely reusable.

 

EJ25 headgaskets fail all the time.  It is best to be very thorough in the repair:
1. use Subaru gaskets or Six Star head gaskets

2.  resurface the heads

3.  resurface the block if you can

Coolant is full.

Both Fans is on.

Two upper and lower is full when overheating. Radiator should be ok.

Tstat from oreily.

 

Actually I was buy head gasket set from ebay (cheap)

Also installed old blots head.

I did send resurface heads from machince shop.

NEVER use cheap Ebay head gaskets, do as  Gary said, Subaru or SixStar.. Your head bolts are reuseable and not the problem.

Make sure you follow the torque procedure as listed in FSM.

 

O.

 

 

Actually I was buy head gasket set from ebay (cheap)

.

 

that sounds about right - a year/10,000 miles on those cheap headgaskets. best not to use cheap headgaskets on that particular motor.  can probably get away with them on some Subaru engines, but not that one.

Subaru MLS only or Six Star.

 

don't replace the head bolts, waste of time.

 

Subaru tstat is preferred - there's a HUGE difference, here's a picture showing the difference:

http://subaruvanagon.com/tom/Cooling/Thermostats%204%20sm.jpg

Ok, thank for very informative.

I'll going to buy Subaru dealership for tstat. If there's still overheat or not.

Still overheat..

 

So, should I get Fel-pro head gasket which is more better than cheap from ebay?

No. As they already said, subaru or six star head gaskets are the only ones you want.

It's silly price..

I'll try use Fel pro and new blots. Because I've been installed subaru on Fel pro without bolts, there's no problem.

If overheat again but I'm not goin mad.

For not much more money, Subaru or six star head gaskets are much better then Fel Pro, or anything else. I would hate to hear that you had to fix the head gasket problem again in the future, because the Fel Pro head gaskets did not last very long.

So you're wasting money on new bolts, and getting gaskets that are known to be crap on the ej25? Makes sense. Re use the bolts, and get the good gaskets.

As the saying goes, you can lead a horse to water, but you can't make him drink!!!

 

O.

Don't use the TStat from O'reiilys.  I used to work for them.  Get the Subie job.  In the pics above it just looks healthier, but it also has the bleed hole with the dangler check valve to bleed through air bubbles.

Ok. I did buy head gasket from Subaru dealership. This make me worry, already. Haha.

 

I will use re use bolts. Can do use copper spray on head gasket?

No, don't use anything at all on the gaskets. They go on dry.

Thank you for everyone.

End of thread.