99 S80 Coolant Loss Diagnose
 

My friend are leaving US, and he would trash the S80 as it has a blown head gasket. I told him I will take care of it. Now I am the owner of it.

Head gasket symptom: Coolant loss due to water came out of tailpipe. Coolant tank smells gas like. Milky engine oil. Miss fire.

I am now trying to use gasket sealer to temporarily fix it. When I was flushing the cooling system, I found the driver side carpet was wet: heater core leakage.

Moreover, the cooling system seems to be under high pressure, the upper radiator hose was hardly to squeeze when engine was running. Is this normal?

I have a 97 850 and been working on it a lot. S80 is a little new to me. Is it similar to fix the heater core as 850?

The S80 is a little harder for the heater core.

2 things I can think of
1. Thermostat is stuck.
2. The plastic impellers on the water pump broke and there is no circulation.

There is circulation I think. The upper radiator hose can get hot when engine is in normal temp. The water is warm when I drain it after it got normal temp. This also indicates that the thermostat is good.

That might only be heat from the motor. It is just a thought I have seen a few broken water pumps and thermostats cause the exact same issue.

Yes, I hope if it is due to these things. They are easy to fix!

They are not that bad.

Progress:
Check the spark plug holes. I can see water in No.4. Oil filled No.6.

For heater core, I just bypass it right now. Cut the hoses and connect them.

Tech, how to disable fuel injector in S80? Just unplug the attached electrical switches?

Why do you wan them to not work?

While I checked the spark plugs, I found water in No.4 cylinder and oil in No.6.

Disable the No.4 injector will allow the gasket/block sealer to work. Let it fire will keep sealer from passing through the holes due to combustion gas pressure.

Am I right?

Not sure I do not use that stuff. You can just unplug the injector if you want.

Where can I find replacement hoses that go to the heater core?