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Could it possibly be coming through when the water goes down the drainage hole below the windscreen? Thanks
On some of the Passats and/or Jettas I had between 2000 and 2014, water used to regularly collect in a trench behind a bulkhead at the rear of the engine compartment. This was maybe about 6-8 inches in front of the main cabin bulkhead and was where fresh air entered for the heating and ventilation system so was open to water from the windscreen. There were drain holes with rubber pipes at the bottom but these often got blocked with leaves etc. I don't think any of the water ever got into the passenger cabin though.

The design of the T-Roc is different and I can't see any equivalent trench, although that may be under the large plastic apron at the rear of the engine compartment, so I would say it is not impossible for water to build up and leak into the cabin. It would be worth raising this with the workshop to get their view.
 

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Discussion Starter · #22 ·
Just an update on the water ingress issue which is still ongoing at the moment. Latest is the car was taken back in to the dealers after Christmas for two weeks for the carpet and underlay to be dried out properly as they seemed to think the issue was fixed by changing the two speakers but wasn't dried out properly. The car was put on water test for 3 days under a number of different areas of the car and found no water ingress present. I had the car back around three weeks ago, however we've had a few days of heavy rain fall which has resulted in water inside the car again. Dealer seems to think its now when the car is facing uphill the water is getting in. Running out of ideas any thoughts?
 

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It certainly sounds like the water is from the top down rather than coming in from the bottom. That area behind the engine bulkhead would potentially drain/fill according to any slope, with facing uphill causing a partial filling as the drain holes would be at the front and hence probably higher than the seam at the back. It's also the area where air is taken in for the heating/ventilation system, so the water might be going in through that rather than getting through the seam, or screw/bolt holes. The area behind the bulkhead was open at the top in my previous cars, so you could see when water was building up, as happened with one of mine due to blocked drain holes but ti didn't get in to the interior of the car. Not sure how much work would be involved in removing the plastic tray covering that now, but I'd guess it should be possible.

I would park the car facing uphill and fix a garden hose pipe (without the spray/nozzle) to run water either from the top of the screen or into the area at the wiper arms. Leave it running for a while and check the inside for water ingress, although that might be harder to ascertain if the carpets etc. are already damp.

If that doesn't find anything then I suppose you would have to repeat this with the car facing downhill, but as I said above, I think that is less likely.
 

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R-line 1.5 TSI MANUAL
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Sorry to hear the problem wasn't solved, so disheartening 🙈🤷‍♂️
Fingers crossed they get it sorted for you 🤞
 

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Watching a wheeler dealers, they diagnosed a leak by using a smoke machine IN the car and watching for where it appeared outside! Quite good I thought, as the smoke was quite visible, and nothing got wet.
 

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T-Roc Sport 1.5 TSI 2021 MGB6
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These problems of water ingress are always a nightmare.
I had some on my first old cars but having that on a new car with the price of a T-Roc is surprising.
Unforunately, as I don't know the car (still waiting delivery) I can not help...
But I would like to give a "moral support" and cross finger for you.
 
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