Suffered a breakdown myself the other week...engine temp shot up on motorway so pulled over immediately.
RAC came out, it was a bleed valve on one of the hoses that had failed (plastic) and leaked all the coolant out.
Recovered car to dealer, who said the whole hose needed replacing as the valve itself is an integral part of the hose.
Car is pre-reg and in 3rd year, so only an AA-supplied dealer warranty in effect, and of course hoses are not covered under the warranty (why would they be, I mean there's no point in having a useful warranty now is there?!).
Total cost to fix was a not-too-unreasonable £108 and luckily no head gasket damage.
RAC came out, it was a bleed valve on one of the hoses that had failed (plastic) and leaked all the coolant out.
Recovered car to dealer, who said the whole hose needed replacing as the valve itself is an integral part of the hose.
Car is pre-reg and in 3rd year, so only an AA-supplied dealer warranty in effect, and of course hoses are not covered under the warranty (why would they be, I mean there's no point in having a useful warranty now is there?!).
Total cost to fix was a not-too-unreasonable £108 and luckily no head gasket damage.