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[polilara]

Realized it Last Summer but thouht that boot had been open. No, it is not that. Very much water. Where can it come from. The spare weel in bottom is swimming in water. Only thing I see is the rear wiper shaft going through rear window is a bit loose, please help.

[Marks DTM Calib]

Check the seal where the wiring loom connects to the rear lights, pop the lights out for a better look

[Doctor Gollum]

That won't fill up the spare wheel well on an estate as it will drain into the rear quarters first... Unless sooo much water is getting in that it's running along the rear panel seam, but even then it would have to overflow the lip where the latch is. That said, it could be running down the loom between the rear lights, but it would be coming from higher up...

Any evidence of rust at the bottom rear corners of the rear quarter glass? If yes, then expect a hole behind the black trim. Easy enough to access: remove the inner trim from the C and D pillars and undo the twenty thousand 10mm nuts. Window then comes out and you can access the screws that hold the trim in place. Should be possible to effect a decent repair without it showing past the trim... But whatever you do, don't fill the trim with sealant.

The body vents are into the wheel well, but unless the car was reversed into a pond and left there it should drain out through them. Incidentally those vents are designed to open towards the low pressure at the back of the car as it moves forwards and hang closed when stopped. Ignore all of that, it's an Astra, not the Omega

[STEMO]

That won't fill up the spare wheel well on an estate as it will drain into the rear quarters first... Unless sooo much water is getting in that it's running along the rear panel seam, but even then it would have to overflow the lip where the latch is. That said, it could be running down the loom between the rear lights, but it would be coming from higher up...

Any evidence of rust at the bottom rear corners of the rear quarter glass? If yes, then expect a hole behind the black trim. Easy enough to access: remove the inner trim from the C and D pillars and undo the twenty thousand 10mm nuts. Window then comes out and you can access the screws that hold the trim in place. Should be possible to effect a decent repair without it showing past the trim... But whatever you do, don't fill the trim with sealant.

The body vents are into the wheel well, but unless the car was reversed into a pond and left there it should drain out through them. Incidentally those vents are designed to open towards the low pressure at the back of the car as it moves forwards and hang closed when stopped. Ignore all of that, it's an Astra, not the Omega

Estate? I thought he was describing a GTC, or hatch.

[polilara]

Ye@s, not Estate but Fastback meaning "Short Roof".

[STEMO]

Ye@s, not Estate but Fastback meaning "Short Roof".

So....back to Marks suggestion about the light seal then.

[polilara]

Yes, now in Mobile home, let's see on Monday.

[Sir Tigger KC]

The spare wheel well used to become a pond in my Mondeo hatch as well, and I found that behind the rear bumper there are two vents on each rear quarter where the bumper wraps around and the seals had failed on both, letting water into the boot.

Removed the bumper, refitted and resealed the vents with silicone, and that sorted the problem. 

You may or may not have a similar issue, but worth finding and checking the vents are watertight.