Cooling system

Start with checking that the thermostat is working, it may be stuck closed. Also, check that cooling fans are turning on and a part blocked radiator can also cause similar problems. A back flush will not be enough to clear any blocked core tubes. You will need to have the radiator out and professionally core cleaned. But look into the first two options before doing the radiator. Finally you can do ahead check, this is a quick and simple test for exhaust gasses in the cooling system, a mechanic can do this while you wait, it takes just a few minuets to do. If this is positive you will have a head or gasket problem causing your issues.

If I can put add my two cents. Check the radiator cap to make sure it can hold pressure.

Please let us know.

Supercharger reservoir? Not sure what you mean here, has the car a turbo charger (exhaust driven ) or a super charger (mechanical driven)?

Okay, have not see one like that, but you will have to treat it like a normal cooling system, pressure test for leaks, it the header tank for the super charger is the only section over heating, you will have to investigate why this is so. Is this an after market fit or was it factory?

Yep, we are confused because your car does not show a super charger. Here are the belt diagrams for both engine. But I do not see a super charger. Can you get a picture of the engine of us?

Check out the diagrams (below).

Please let us know what happens.

Cheers, Ken

Is this a EURO car? Can we get a picture?