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Might be mostly water. Check the gravity of the coolant, one of those little floaty ball things at walmart, $2, If it is not up to par with 50/50 coolant, fill it up or drain some of the water out. It is building up too much pressure and releasing the boiling stuff into the reserve tank, the cap could be bad, not tight, could be a blown head gasket, check this stuff out. Look for oil in the top of the radiator, steam out the exhaust, usually loses water though. Water boils at 220 and coolant 260 in a closed system, keep an eye on the temp gauge, do not let it over heat. It will be shot if it does. Hope this helps.
It can be if it keeps boiling the water. Your tank will have a pressure relief valve with a copper pipe dropping down near the floor...is there signs of water coming out of the pipe? Be certain it is working by testing it...lift the lever in the center of the relief (Place a bucket under the pipe first to catch the water that will flow out). Over time these valves can rust up and not work.
In the worst case, boiling the water causes steam build up in the tank which is under pressure. Enough steam can cause the tank to rupture and that is a bad thing.
I am not certain but you probably need a new temperature probe if the tank is over heating the water inside.
If the water tends to keep going down then there has to be a leak somewhere. Try also looking at the hose coming from the overflow tank and see if the hose might be kinked. You might also be blowing antifreeze out the tailpipe. Take a look and if there is bluish white smoke then you have confirmed that theory,
What's happening is that it isn't leaking, it's boiling over. You need to turn down the thermostat under the top lid. Also, before you brew coffee, add water to the tank and let it pour into an empty pot. Once it stops brewing, let it heat up for a few minutes then make your pot of coffee.
I would suggest descaling the unit, or replacing your thermostat.
A defective thermostat would not cut out the heater after the water is boiled, excessive scale would render the thermostat ineffective, but not to the extent you describe.
Hi you need to put 5ml of Kal Stop fo Polti machines into 1000/1500ml of water into the tank, The stronger solution is better (1000ml) Let it heat up and this should break down the limescale on the solenoid. I tried this today and it has worked saving ££££'s in repair by Polti.