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Coolant Leak When Garaged


jharri92

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I don't drive my car over winter and usually, it gets all wrapped up and sits there in the garage until next spring with no problems. This year, however, I have noticed a small patch of coolant underneath the nose of the car. After a bit of investigation it seems that it has a very slow weep from the point at which the hoses enter and leave the radiator... hoses are all in good condition and clamps are nice and tight. It only seems to happen when it is very, very cold and it is only a few ml, but how can I stop this? 

(2016 310S)

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more likely to be the metal in the necks contracting, ally rads in particular, which has a loosening effect on the clamps.

If your running silicone hoses you can lube the inside of the clamps with a little vaseline to prevent the hoses wrinkling as you retighten the clamps, and use clamps with a small flare radius on the edge of the band too.

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I had similar problems when I fitted silicon hoses. As 7WOW suggests, a bit of lubricant and some better quality Norma clips with a stainless band liner cured it for me.

That said, I did have one brass rad crack the soldered joint on the bottom hose. The rad has two sets of fixing holes and I found with the bottom holes (higher rad position) it rubbed on the nose cone. In the upper holes the bottom hose pressed hard against the chassis tube which I think caused the cracked joint. I just drilled a hole in the rad fixing plate in between the upper and lower holes to get the optimum position.

Ian

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