Originally Posted by Mikester

I personally would not drive at 230...

I think you have a leak somewhere. The system functions under pressure; which is what helps keep the coolant from boiling. Build heat by boosting, pressure escapes out of a weak point in the system (boils), temperature rises.

Check the coolant feed/return lines & crush washers (if applicable) on the turbine... It could be tight enough to keep the coolant in under cruise; but not enough to keep it in under boost (heat). To add insult to injury, if it's a leak like I described, only steam will escape and/or the coolant will boil off on the center section of the turbine... so you'll never really see a puddle or drips.



The thermostat is there to keep the coolant to within a specified heat range. Continuously flowing coolant thru the radiator will not cause an overheat; and will definitely not cause the temperature to rise quickly... It will cause the coolant to warm up slowly, then 'overcool' when driving. The reason it opens/closes is to keep it warm (thermo closes, coolant heats up)- but not allow it to get TOO hot.


I think it's a leak at the turbine. If it were the cap, I think there would be coolant boiling out of the reservoir.

I hear a lot of stories about burping the system etc. To this day, I have still never had to burp my coolant system- just fill her up; drive and service as needed until it doesn't need anymore- never overheated.

One last 'totally dumb' thing to check- and I promise I am not trying to insult anyone's intelligence...

since you've been doing all this servicing & flushing... maybe check the drain plug...