BMW Z3 1999 | Water Leak Detection

Video transcript

0:00 Ok, today we have a BMW Z3 1999. So let's just quickly show you what we've found, because we've just carried out our water leak procedure. So what we're first going to concentrate is on the driver's door. Obviously we know that the water is collected in the driver's front footwell.

0:21 So if I just quickly put some water down the back of the window, just to simulate that it's out in the rain. Now if we come down the bottom, we can see that it's coming out the bottom of the door, which it should do. And but if we look closely, we can see a run mark. Well, there's one run mark here, we have a second one, and we have a third one. And what that's then going to do is it's going to sit on top of this rubber here,

0:46 and then when it then builds up it will then work its way into the car. So that kind of corresponds with the drivers footwell being wet. And another quick one as well: I don't know if you can see there, and but we've got water what's been dripping out, and that's actually a common fault on this model of car. And what it is is, underneath your front scuttle area they've got the drainage on either side, but they also have two drains in the centre, and when they get

1:19 blocked, what they then do is it lets it come through a seal which is holding your blower on. Apparently it's down to the sealant just gets old and falls off, or it could just be a case of the drains are deblocked, or needs to be deblocked. Just to quickly show you as well, for this one I'm going to have to shut the door. So we've got the door shut now, so what we're going to simulate is we're going to put some water on the outside of the car, but we can see that the window seal is not making a good seal.

1:53 And so if we just put some water down here in a second. There we go, so we can see it running down on the inside of the window. So it's not a lot, and obviously that's showing signs that that's leaking down the window on the inside. And also on the back of the window here we just put some water. Okay, so we can see that it's getting in on the inside of the window, and then what it's then doing is collecting down here, and then obviously it's overflowing on this bit here.

2:27 Which ain't going to cause major issues, but obviously as you can see here, this is all designed for it to run out. So obviously if this isn't running out the same way, it's going to cause it to possibly come on the inside of the rubber and also go into the drivers footwell. The passenger door membrane is doing exactly the same thing as well.

Jun
04
2021

This BMW is leaking through many of the places we would expect on a 22-year-old convertible, plus the heater matrix, which is a common problem on this model of car.

The drainage holes in the scuttle block up and then water can overflow back in through the bulkhead, a problem which can be exasperated by deterioration of the seals because of age. 

Aside from that, we have both door membranes leaking and a modest amount of water getting in past the rubbers around the windows.

Solution: We will clean out the scuttle, unblock any holes and reseal the heater.

The door membranes will be replaced, and we will clean the rubbers and use a rubber reviver which will hopefully help them find their original shape and plump up again, so they form a good seal. This should be enough to solve this problem.

We dry the car, and then it's having some other work done to it which you will be able to see on our other channel. 

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