Airlock

[Geowiz]

I have an airlock in my Duratech engine. How do I clear it?

[Slonie]

So just to clarify — you've got an air bubble in your cooling system? What are the symptoms you're experiencing? Thermostat not opening? There are plenty of resources if you search about bleeding/purging a cooling system, but the upshot is usually to try and get your bleed port (either the top of the radiator or the top of the expansion tank) higher than everything else, lifting the front of the car can aid in this. And of course, having a big funnel fitted to the top of the expansion tank that you can keep topped up while the car is idling and you're giving the radiator hoses a good squeeze.

 

Although, after many experiences of bleeding a cooling system the old fashioned way, I've become a believer in a vacuum cooling system filler tool, myself. I also added a bleed tee to the upper radiator hose (before settling on the vacuum tool) as that part is higher than the expansion tank on my car.

 

https://www.amazon.com/dp/B01BW39HJS

 

This is the tool I used when I filled my system last year.