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Discussion Starter #1
When our Clio went in to have its F3 brake band replaced it was dribbling water from somewhere - it got a bit hot driving it to the garage using the 3rd gear temporary fix.

The gearbox specialist investigated the leak while they had the car on the ramp and said the hoses were sound but it looked like water could be coming from a plastic blanking plug on the radiator. It only seems to happen when the system is very hot. Maybe somewhere near the fan switch? The cooling fan is cutting in and out ok, incidentally.

Stuck in traffic today I watched the temp gauge go up and then noticed steam coming from under the bonnet. I had topped up the expansion bottle earlier in the week as it was very low and when I parked and checked again it was back down to minimum.

So, anyone know anything about this mysterious plastic plug on the radiator and whether it can spring a leak when the system pressure gets high? If it can leak, is it possible to repair/replace it or is it a new radiator job?

All answers/suggestions (polite ones!) gratefully received as usual.

Thanks folks.
 

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Discussion Starter #2
This has now been fixed by our doughty local mechanic.

Turns out there *is* indeed a plastic blanking plug in the radiator and it was leaking when the system was under pressure because it had cracked - with age, presumably.

Our man fixed it by screwing in a random dud old sensor with the same thread size.

Problem solved.

But the air con still won't work - see my other posts - magnetic clutch won't kick in. Does it have a fuse? Any way to test it?

Plenty of pressure in system and of course ventilation fan is on first. Was working until a few months ago - mysterious!
 
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