[928uk] Wet patch

[Paul R Smith]

A dry sunny day today, so I got on with this job. I did warm the car up 
first for my comfort and to soften the old mastic. The recirc box came 
down without much force, but I did note that it does have to come 
straight down until it clears the studs which are quite long. I found 
why it had leaked. The noise absorbing wadding on the metalwork covered 
the area where the box seals to the metal. It looks like it has been 
like that since new as the adhesive backing from the wadding was on the 
sealing area. What it meant was there was metal, wadding, mastic, then 
the plastic box, so that water would soak through the wadding if there 
was sufficient water there for sufficient time, so either heavy ongoing 
rain, or being parked nose up in rain (the drain for this area is at the 
front). The old mastic came away quite easily. I trial fitted the box 
several times to get wiring out of the way and work out the angle of 
approach, then put new mastic around the join and put it all back 
together. Took about 3 hours.

Smiffy

On 05/01/2022 19:28, Ben Hodges wrote:

> Hi Smiffy
>
> Glad you’ve found it and it’s a easy enough fix compared to a 
> windscreen issue.
>
> The 3 blower fan screws (2 from the top and one longer one underneath) 
> need to be removed as you say.
> Ideally fan unit should be removed to allow even pressure on the box 
> from above to push the box down through the hole. You may damage it 
> trying to pry from underneath. Liberal use of heat gun/hair drier on 
> the old caulk first would help when it’s cold.
> Then remove old caulk and replace with new stuff.
> Clean all crap out from under the scuttle first to avoid an avalanche 
> of old leaves falling into the car when the box is removed. Worth 
> checking the re-circ vacuum actuator whilst you’re in there.
>
> Teaching granny to suck eggs here I’m sure but may be useful to others…
>
> Cheers
> Ben
>
> On Wed, 5 Jan 2022 at 17:05, Paul R Smith via 928uk 
> <928uk at lists.928.org.uk> wrote:
>
>     Thanks for all of the suggestions.
>
>     I took the side trim off the windscreen so I could see the where the
>     glass is glued on then started the soaking.
>
>     No sign of water inside so I started to reassemble in the foot-well,
>     then I saw a drip. The water must have been seeping through very
>     slowly.
>     The leak is (as originally expected) from the edge of the fan/re-circ
>     flap box. I've now got the electrics panel moved enough to get all
>     the
>     nuts off the "box", but it is still held in place by the mastic, and
>     presumably the fan above. It got a bit too cold for me this
>     afternoon,
>     so I have left it for now, but I think I will have to unbolt the fan
>     then lever the box down so I can all more sealant.
>
>     Smiffy
>
>
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