Posts: 30
Since: 6/9/2008
Status: offline
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WET CARPETS AIR CONDITIOING WATER LEAK FIXED!!!
OK, quite straightforward really. Firstly if you are getting water on the drivers side (UK cars only) then you are at the early stages of a blockage and if you are getting them on the passenger side or you can hear water moving about then the system is fully blocked and full of water. If so then you will need a new pollen filter (DESMO B838 £20-40) before you start taking things to bits as the old one will be full of water. Although the quick fix procedure is worth doing straight away anyway.
Basically it would appear that the drain tube that exists throught the transmission tunnel just by the drivers left foot gets blocked and then the water backs up into the matrix then the pollen filter and then over to the blower motor on the passenger side, leaking out of the seals in the motor or where the wiring for the fan unit is.
Quick Fix
Without removing any trim (although its easier if you remove the drivers side tunnel carpet and mats). There is a big black drain tube that runs from the middle of the tunnel top to where the foot rest is for your left leg. pull the tube up and out and the unit should dispense all the water on to the carpet, so have a cloth ready. Where the tube entered the tunnel there is a square rubber surround with a funnel end that goes to the outside of the car, remove that and you will probably find its blocked where it narrows at the bottom. This is to stop stuff from coming back into the car from outside. I cut the end off mine to stop it blocking again, much easier. Replace the square funnel, check the rubber tube is not blocked by running the fans (in econ mode) and you should be able to feel air pressure thought the tube. If all well then refit the drain hose otherwise check that the drain tube is not kinked or blocked by getting your head in down by the pedals. JOB DONE!
Clean out
If water has got as far as the passenger foot well then you are going to need to clean everything out which is probably a good idea anyway as the original blockage looks to be caused by a small build up of decaying matter that has entered the system from either the internal vents or the outside vent. First off make sure you have a replacement pollen filter DESMO B838 although most motor factors have them listed from the cars make and model. Remove the middle wiper arm with a nut and a small amount of prying. Remove the scuttle panel (lots of screws) only unscrew the top screws a few turns as they have square block connectors on the other side that should pull out and will fall off if you unscrew too much. The scuttle panel hooks under the windscreen so gently ease it out. Disconnect the washer jets or just place it out the way. There is an additional panel with four screws on the passenger side that reveals a mess covering the air intake for the fan, remove all this, clean out the leaves and vac out fan motor to make sure there is no leaves in their. Water was visible in the bottom of the fan motor. Next unbolt the wiper arm mechanism (two bolts) so that you can move it out of the way enough to access the centre panel. Remove the Allen key bolts in the centre panel and the cover which will then allow you to access the pollen filter. The pollen filter is held in place with two bolts and then you need to move the wiper arms in order to get the filter out. Mine was soaked and again full of water and leaves. Clean all of that out (we used a Henry wet and dry vac with a thin hose attachment) and fit the new pollen filter. We also ran a blower into the fan motor area to dry out the area before refitting everything in reverse.
Time will tell if this has been a complete success but as we found a blockage the rest does appear to be logical. I took some pics so will try and upload them at some point to give people a better idea of what to do. Let me know if this helps of if you need something explaining in more detail.
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