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Hi there, can anyone help? after finding that my 450 Smart 2003 kept loosing water from coolant bottle ( in front) , I was told that head gasket needed replacing.......this done......then mechanic said fan did not work , 4 blobs appeared.....now im told that its back to original problem.....fill litres of water into coolant bottle.....water ends up in silencer/exhaust......... im at wits end
Thank you for any assistance
 

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1st remember there is normally a little water from combustion and the catalytic convertor in the exhaust. But if you are losing coolant then they either didn't fix the problem with the head/head gasket or you have a cracked block. Or possibly a coolant leak.

For coolant to get to the exhaust it has to get into the combustion chamber. It can only do that through either a crack in the block or head. Or due to a bad head gasket that is not sealing. A warped head or block could be part of the gasket sealing problem. The coolant jacket and the combustion chamber should never ever meet.

The job wasn't done properly! Whoever did it failed to ID all the issues such as a cracked head. Or they just didn't do it right.

When head gasket blows it is usually due to over heating or sometimes a failed injector causing locallized overheating. Or just bad design materials.

Anytime this happens the head needs to be sent a GOOD machine shop to check it for flatness and to make sure it has no cracks. In reality it is just dumb to not do a valve job while the head is off as well. The mechanic should also check the block deck for flatness with a straight edge and feeler gauges to make sure it is in spec.

I've done this job twice in the last year on cars other than a Smart. The process is the same. An engine is an engine. Skip a step and you are likely to have to do it again. Cover your bases and you get another 100k miles before the engine gets opened again.

There is a test to check the coolant for combustion gases. On a car like a Smart with the radiator so far away from the engine you may not see bubbling. So it can be analyzed chemically. It's just a test strip and a good mechanic should be able to check this.

A smart requires jumping through some hoops to get all the air out of the colling system. If this is not done properly then it's possible to get an air pocket in the coolant passeges of the head and this will cause overheating and a cracked head.
 
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