Hi The garage say the head gasket is blown and the block probably cracked. They say that is why the water is not circulating and boiling in the header tank and creating lots of steam. They say steelseal won't work. But is it worth a try? I've nothing to lose except for £30. Does this analysis by the garage sound correct. There is no water in the oil you see.
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1) Cracked or warped cylinder head 2) Cracked engine block 3) Blown head gasket
Blown head gasket is the best you can hope for. And cracked or warped cylinder head is next most likely. A cracked engine block is least likely of the three. Have you noticed anything unusual, heard any noises? And has the car overheated really badly?
Try removing the thermostat and then remove the bleeder screw, put in the water hose in the radiator/expansion tank and see if the water comes out with pressure. If yes the system is not restricted but otherwise probably the radiator is blocked.
A cracked block often results in oil in the antifreeze. A cracked head or blown gasket is often heard while accelerating plus it my chug or miss. Take it to another garage and get the system pressure tested. I am not sure if thats what you meant by "a carbonation test". Check for milky looking oil on the dipstick first. If its normal then have the garage inspect the head for leaks using an ultraviolet light around the heads. It may a clogged rad or a faulty water pump too, even a faulty rad cap. Let me know any more info when this is checked. I hate to see someone ripped off.