Cold legs?

[Luckyone]

I finaly tested the properly sealed up footwell the other day on a long drive, the laptop was showing an intake temp of 2deg but I was nice & warm in the car at motorway speeds. (I need to check why the ice warning light didn't come on now though!)
I always use to get a very cold right leg. So I pulled this out of my rather long rebuild thread

I hope the pictures still work...

Luckyone said:

Many years ago I tried to seal the cover panel back on better to stop those cold drafts you get on your right leg in the winter, but even after my best efforts (with the pedals getting in the way) there was still quite a lot of leakage of air from the high pressure inner wing into the car. I was pleased to find this hole (circled in red):



This is an open gap up to the inner wing that would have been letting air through, so I’ve sealed it up from the inside of the wing. Not all Cerbs will be the same but if yours has this hole too it would be easy to seal with expanding foam, only needing the carpet to be move to get at it.

Ram air effect may be a bit dubious when it comes to tuning engine but for cooling your noggin you need all you can get, if the high pressure (in the summer time hot) air in the inner wing isn’t all being forced though the A/C evaporator it’s just a waist, not only that, hot external air is leaking with some force into the car heating it up as the A/C is trying to cool it.

If it’s still crap after all that I’ll just use my inline fan again:



Here is the foot well panel fully sealed back in after I’d taken the AC unit out back up the page:




There is a large gap at the top on mine, so I used a bit of glass shaped to fit with the edges left raw so I could sick it in nicely with a hot glue gun to really seal it. The hot glue should be easy to get out if I ever need to take the panel out again.

I do still sometimes use my in line fan, but not quite as much as I did before that sealing up.
There is more about the fan on at the end of my old rebuild thread.

[FarmyardPants]

The main cause of my Cold Leg Syndrome is that the ball air vent leaks cold air even when closed. There seems to be a lot of pressure in them there hoses.

[Luckyone]

FarmyardPants said:

The main cause of my Cold Leg Syndrome is that the ball air vent leaks cold air even when closed. There seems to be a lot of pressure in them there hoses.

There should be a bit of pressure in them at motorway speeds.

There is also a one way valve (a bit of aluminium hanging from a hinge) where the cold feed pipe enters the centre air box (the pipe that runs over the top of the drives foot well) that should get pushed shut by the pressure of the hot fan when that is on, so stopping the flow of cold air in. When you get the speed of the hot fan matching the pressure of the cold air being forced in by road speed you can here a little klinking noise of that valve.
I think someone on here found there's was stuck after one of my other posts about converting the earlier Cerbs to having the hot air in recirculation like the later ones do.

Otherwise you could try a new vent, there are loads of types about now, I fitted some here:

[Mr Cerbera]

Brilliant Thread