A little while back when i was doing my rear springs and i was under the car i noticed this connector had corroded pic 1 and broken away it might be worth checking yours out if you have time i rejoined it with a scotch lock connector as below. Also sometimes these can leak so i am informed, also worth checking at the same time.
Note the connector on the right by the brake sensor which had also be tucked up there for some reason not now though.
Broken connector note allen key bolt.
Connector just placed close to show where it belongs.
Old end chopped off and new connector fitted.
All finished note in some of the pics how the fins have got bent from road debris i presume ? you need to check for leaks were the welded pipe fit into the little radiator in two places front and back. Also make sure the rubber pipes are secure.
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