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T6 XC90 boiling coolaint

Mr.Borrie

The Sneaky F*ing Ukrainian
Joined
Aug 1, 2006
Location
Netherlands
Got an strange issue with my T6 XC90 2004
Just replaced the head and Headgasket 3000 KM ago then now radiator gave out on the freeway.
Since my PVC trap (and coolant / breather pipe thing) was up for replacement and the radiator was out i replaced that along with a new radiator.
Situation now:
The temp will jump in minutes, when i take the rad cap off it pukes out all the coolant.
All cylinders have 8.5 bar, leak fluid test is negative for leak headgasket.
I did found one vacuumhose i left unattateced and have no clue where it goes , added photo
I am getting a bit sick off this car so help in diagnose this new thing would be very appricated
 
When you put in the radiator, did you remember to pull any possible plugs out of the ports?

This is speaking from experience. I had pretty much the same thing. Changed the rad, car would over heat within 5-10 minutes of driving. Pulled the rad hose off, found the plug pushed itself into the rad hose. Some of the plugs they use are near invisibile.

Jordan
 
Replaced the thermostat yesterday, tested the old one and it semed a bit slow compaired to the new one.

I did notice some more flow in the resevoir but not specteculair.

What i noticed now is that the upper rad hose gets super hard and hot.. temp sensor on the dash will pop up to warm again. when i open the cap it pukes coolaint still.

I guess the only thing now is the waterpump.. or am i missing something.
 
Did you check to make sure the upper radiator hose and radiator inlet isn't plugged?

"upper hose super hard" sounds to me like it's getting pressurized a lot more than it should...
 
Did you check to make sure the upper radiator hose and radiator inlet isn't plugged?

"upper hose super hard" sounds to me like it's getting pressurized a lot more than it should...

Like the plugs they seal some aftermarket rads with......

It does sound like a blockage.
 
Like the plugs they seal some aftermarket rads with......
I did that once. :wave:

First clue was "Why is this hose so hard to get back on? Must just be stiff".
Second clue was "Why is the coolant filling so slowly?"

Wouldn't be so bad if they actually were orange, but they're usually black, with a deep center, and a narrow flange that's easy(ish) to ram the hose over if you don't notice it's there.


nipplecap.jpg
 
I did that once. :wave:

First clue was "Why is this hose so hard to get back on? Must just be stiff".
Second clue was "Why is the coolant filling so slowly?"

Wouldn't be so bad if they actually were orange, but they're usually black, with a deep center, and a narrow flange that's easy(ish) to ram the hose over if you don't notice it's there.


nipplecap.jpg
Lol exactly what I did. Popped the top plug out, got pulled away, didn't remove the bottom. This was on an 850. Topped up the coolant without thinking much of it. Few minutes into the road test over heating. Checked EVERYTHING before listening to my foreman at the time. Found the plug in the hose. Oops.
 
I will be interested to see how this ends up because despite your combustion leak test giving you the all clear, this has every classic symptom of a head gasket or cylinder head failure, including the previous radiator failing (can we assume it failed catastrophically? That is, ruptured?)
 
You and me both.. this is so odd!
The radiator was blowing at the top side, the XC90 does not revail anything untill you drop the radiator but we pulled the top hose and it was intact and thus ordered the radiator.

However i cannot really seem to be able to find the crack in the old radiator... to add to the mystery. Not pressured tested it as the new one is already in there.. but yeah its a mystery
 
Today had a look at the radiator (nissens) , draining around 5 liters from as expected with that amount there are no plugs to be seen.
It seems to come down to the water pump.

I was thinking, undo the upper rad hose and wait for the thermostat to switch open, if the pump works it would blow out that hose crazy right.. as a final test before undoing the timing once again (taken this brand new belt of 2 times already in the last half year)
 
Just to report back it was the water pump, the plastic scoop came undone.
I put in a OEM Volvo one thats all metal and its all good now.
 
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