no I never used any sealants . And yes the clutch fan is not that old and it’s nice and tight and when it’s on I can feel big air flow going thro from the top of the radiator , I tried to bleed the system multiple times but see last night when I took her for a ride the hoses were rock hard and the reservoir hose look swollen from the pressure and the reservoir was bubbling. I don’t know why there are a lot of pressure. When it’s on idle it’s no problem it’s only when you take it for a drive. I even ran a pressure test 15psi after I installed the new radiator and the pressure was good and didn’t drop. Is it possible that my head gasket leaking pressure to the coolant passage? Like a bad head gasket ?

 

do you have a boriscope? maybe you can look down into your pistons to see if there are pistons that look cleaner then the others or a sign of coolant in the combustion chamber while you have the coolant system under pressure..

 

I do yes I am gonna check out also I am gonna also do leak down test to confirm more on what is it

 

There is nothing to bleed in the I5 cooling system, it will bleed itself in a couple cooling cycles through the reservoir.

Did it have the problem/symptoms before you changed the T Stat?

220F is not overheating either. It is hot, but a long way from an overheat at 250F +.

 

No it happened before i changed it. Yes but the fact that the hose is rock hard and bubbling is not good

 

@NFS I don't see if you have reported the actual coolant temperature you are seeing? Your check for exhaust gases in the coolant indicates its not a leaking head gasket, so it seems the most likely thing is overheating. Perhaps you have an internal hot spot producing vapor bubbles that are getting vented into the overflow tank, which could be a byproduct of @bronxteck's suggestion of clogged passages.

Has the head gasket been replaced recently? IIRC the I5 gasket can be physically installed upside down (all but 1 bolt holes align), but doing so blocks cooling passages and causes overheating.

 

it was getting hot like 225, and I didnt continue to drive it because it probably will raise more

I did replace the head gasket a while back but I never had issues till now

 

Did you check the entire coolant system for a huge temperature variance(cold spots/blockage) with an

Infrared Laser Thermometer?

 

no i dont have that? But how and where to i point that too? Also what this can make a difference?

 

How long after you replaced the head gasket did you start to notice this bubbling coolant issue? A few hundred miles, or thousands of miles? What was going on that made you notice the bubbling coolant tank issue?

About the IR thermometer, you use it to measure the temperature at different points along the block and at different components in the cooling system looking for abnormal temperatures, which will help reveal if you have excessive hot spots in the system that would indicate a blockage or some other type of issue causing high temperatures.