Pretty sure I have another blown head gasket because I'm losing a lot of coolant. I'm getting the waterfall behind the dash every few days and have to add several pints of fluid via the bleed screw in the T. However, the reservoir always stays full. Is this an indication of a bad thermostat, or is there another possibility?

 

 

Yes, there is absolutely air in the system. That's what is responsible for the waterfall, and that's what I'm displacing when I'm pouring in the coolant. But with the amount of fluid I'm adding the level in the reservoir should be going down a bit, even if there are air pockets still remaining fterwards. But it's not going down at all.

 

 

The system is pressurising and when I fill via the bleed screw it starts to drip from the overflow pipe on the reservoir. I will check the other hoses going to the reservoir though.

 

 

The tank is full. The system is not. Adding more to the tank would literally just be pouring it on the ground.