2000 V70 XC ejecting coolant at return tank

[Eddystone]

Erikv11 definitely has better manners than I do and more patience, too.

It has been a stressful week, and I'm about out of patience with people.

God bless you, Neil, for taking us all in and providing a nice home for us..

[Rocket99]

So...we are on the right track.

Misha would these make sense to you:
1. "Coolant should not boil at temp. Thermostat is 190. 50:50 boils at 223. I’ve driven 5 hours with the cap off (by accident) and didn’t blow the motor or overheat it. "
My comment:
Running 5 hr without coolant pressurized?? .... these systems require pressure to not boil, I believe. Maybe ok on a freezin ass cold day.

2. A V70 thread: My temp gauge sits at 3 o'clock as long as the engine temp is between 150-220 (F presumably) (measured by my Scan Gauge).

[misha]

Pressurised coolant (50-50 mix)will boil at 120C.

Driving with cap off will not overheat the engine as long as it have coolant in the system.
There is ECT which will turn on the cooling fan around 100-110C...pressurised or not.

Proper pressure in the system is just helping the engine not to overheat if cooling fan is not turning on or not working,when temp needle climbs to red mark(well just a hair under it),because red mark should be 120C.

[FLXC90]

So...we are on the right track.

Misha would these make sense to you:
1. "Coolant should not boil at temp. Thermostat is 190. 50:50 boils at 223. I’ve driven 5 hours with the cap off (by accident) and didn’t blow the motor or overheat it. "
My comment:
Running 5 hr without coolant pressurized?? .... these systems require pressure to not boil, I believe. Maybe ok on a freezin ass cold day.

2. A V70 thread: My temp gauge sits at 3 o'clock as long as the engine temp is between 150-220 (F presumably) (measured by my Scan Gauge).

Glad to hear the result:

1, if your coolant mix has a boiling temp of 223, unless you heat the motor to that, it will not boil. If it is circulating, and the radiator is effectively removing heat from the system, you may never boil the coolant. But not consent to run unpressurized.
2. The gauge in the cluster is not a precision instrument. It will show if the engine is getting hot, or the difference between cold and operating temperature. It won't tell you the difference between 180 and 220 though. If the temp light comes on, pull over and tend to it.

But as said many ways in this thread. This is a well designed system. Materials (plastics) have defined lifespans. But don't go cheap, get OEM replacement caps and bottles, they will serve for another 20 years.

Also, the chemical solutions of coolants can affect the parts of the system. So keep a proper mix of a proper coolant, and don't let it get contaminated if you have to top it off.