Radiator Expansion Water Tank Cap Compatible for Fiesta Focus C-Max Mondeo

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The leak has definitely been repaired and despite the coolant bubbling after every trip to/from work, it doesn't look to have decreased in volume in the reservoir. The running temp (on the dashboard at least) seems to be normal, the only thing that's changed is that the fan boots in a lot sooner than it ever had done beforehand (I don't really expect it to have to come on for a 25 minute drive on residential roads). One thing I have noticed is that the fan doesn't seem to come on if I run the heater inside the car. Not entirely sure why this is, but in all honesty I know next to nothing about the internal workings of cars, hence why I went to a mechanic in the first place! Make sure your engine is off and cool, the vehicle is in Park or Neutral, and the parking brake is set. If you are not loosing coolant I too doubt if you have a head gasket leak. Yes the garage can test for gases in the coolant but if you have a leak then if the gas comes out into the coolant then coolant would pass the same way when stationary. and be lost.

Clarkson cut holes in his classic Range Rover bonnet on the Bolivia Special to ameliorate an overheating problem, but that would affect resale. Less permanently you could remove the whole bonnet, but I donno how legal that would be in the famously anal UK.

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Never remove the coolant reservoir cap when the engine is running or still hot. Let it cool down first. IIRC, the OP did not tell us the reasons for the water pump replacement, referring only to a coolant leak, but the reservoir blowing was said to follow-on from it, You can buy products in Halfords to seal leaks. There is no need to drain the coolant, just remove enough from the filler tank and add and follow the instructions. There is a lot of pressure in the cylinder head so how effective a seal you could get here is debateable, Coolant circulates through the engine and absorbs heat, helping keep the engine at the right operating temperature. Heater in a car acts the same as the radiator under the bonnet, which is why when the engine starts overheating its a help to use the heater in the car on max hot to help keep engine cooler

The reservoir has a fill range marked on the side. If your engine is cold, the coolant level should be up to the cold fill line. IF you aren''t losing'coolant, I don't quite see what the leak stopper is for. I suppose if an undetectable amount of coolant is passing into the combustion chamber some leak stopper would be drawn in too, but it doesn't seem very likely to seal against combustion pressures.If you had a water pump failure its a fair bet you had overheating. Head gasket or head failure is a common consequence of overheating, so no big surprise there.