Originally Posted By DaveW

So the upper drain serves no purpose unless you get over an inch of water in there...................
I fitted the rubber bulb from an eye dropper over the top one, and some drain tube over the lower one. The angle is tight, but this is better than having the heater drain over the ECU box. I can blow through the tube so its not blocked.
I also fitted this drain tube to the Roadster way back. Only one each side though, and two at the front.






On a car with aircon it is really important to get this tube draining well because of the accumulation of condensed water from the cooling system. Water runs out of the lower drain tube and can run under the ECU box and from there past the cable grommet and into the footwell.

I have fitted a heavier silicon tube and a neoprene gasket to the ECU box to stop the entry of any water. I left the lower edge of the box without a gasket so that any water that did get past the gasket could drain away or evaporate.

In my opinion the lack of suitable seals and drain tubes is a design fault.

Peter

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