Condensation on windscreen

[P4D]

I’ve got a Leon Cupra 300 that I’ve owned just over a year. I’ve noticed recently that the windscreen gets quite bad condensation as well as my pan roof.

Everywhere I’ve looked seems to be bone dry. I’ve checked the carpets, including pressing down quite firmly incase the foam underneath was absorbing any moisture - seems to be dry.

Pillars are dry, and the pan roof seems to drain properly. Areas around the pan roof inside the car are also dry.

Boot floor underneath the spare wheel is bone dry too.

I’ve no idea where else to look. I have wind deflectors fitted to the car, I’m not sure if this affects anything but worth a mention. The owner previous to me had a new windscreen fitted so I’m starting to wonder if it’s been sealed correctly.

Can anyone else give some pointers? It’s starting to drive me crazy.

Cheers

[EdmondDantes]

My golfs the same, and it’s also had a replacement windscreen fitted.

[s94wht]

Yep, I've been noticing the same recently. Also had a new windscreen a few months back

[CraigyMc]

P4D said:

I’ve got a Leon Cupra 300 that I’ve owned just over a year. I’ve noticed recently that the windscreen gets quite bad condensation as well as my pan roof.

Everywhere I’ve looked seems to be bone dry. I’ve checked the carpets, including pressing down quite firmly incase the foam underneath was absorbing any moisture - seems to be dry.

Pillars are dry, and the pan roof seems to drain properly. Areas around the pan roof inside the car are also dry.

Boot floor underneath the spare wheel is bone dry too.

I’ve no idea where else to look. I have wind deflectors fitted to the car, I’m not sure if this affects anything but worth a mention. The owner previous to me had a new windscreen fitted so I’m starting to wonder if it’s been sealed correctly.

Can anyone else give some pointers? It’s starting to drive me crazy.

Cheers

Switch on the aircon. Leave it on.

[sherman]

Throw a couple of large Silica gel bags in the car and see if things improve over a week or so.

https://www.amazon.co.uk/Pingi-LV2-A350-Dehumidifi...

[What The Deuces]

I’ve never had a Vag based car that doesn’t suffer condensation.

ste things

[normalbloke]

It’ll be the rear lights and slam vents I expect, as per every other VAG product. Literally litres of water will sit in the boot corners,out of sight, before becoming apparent under the main boot carpet. You may also find the rear seat passengers get a wet arse.

[530dTPhil]

normalbloke said:

It’ll be the rear lights and slam vents I expect, as per every other VAG product. Literally litres of water will sit in the boot corners,out of sight, before becoming apparent under the main boot carpet. You may also find the rear seat passengers get a wet arse.

I had the same problem on a 2014 Golf 7. I tried all of the usual sources of water ingress with no change in condensation forming. Finally removed the rear bumper and found that the rubber flap vents in the lower rear quarters were loose in the body allowing water to collect in the lower rear wing corners. There was a good three inches of water in each side, but not enough to flow over into the main boot area.
The outer frame for the vents on the Golf had a rubber seal which fitted against the body when the vent outer frame was clipped into place. I removed both vents, cleaned the mating surfaces and refitted with silicone sealer on the faces. Problem solved.

[normalbloke]

530dTPhil said:

normalbloke said:

It’ll be the rear lights and slam vents I expect, as per every other VAG product. Literally litres of water will sit in the boot corners,out of sight, before becoming apparent under the main boot carpet. You may also find the rear seat passengers get a wet arse.

I had the same problem on a 2014 Golf 7. I tried all of the usual sources of water ingress with no change in condensation forming. Finally removed the rear bumper and found that the rubber flap vents in the lower rear quarters were loose in the body allowing water to collect in the lower rear wing corners. There was a good three inches of water in each side, but not enough to flow over into the main boot area.
The outer frame for the vents on the Golf had a rubber seal which fitted against the body when the vent outer frame was clipped into place. I removed both vents, cleaned the mating surfaces and refitted with silicone sealer on the faces. Problem solved.

Exactly this. There are revised parts for the slam vents and the light seals. Don’t bother, they still leak, so just seal them carefully with silicone. Also replace the rubber drain hose in the tailgate that runs from the rear badge to the boot lid bottom lip( if it’s the same as the Golf). The revised part is less than a tenner and this part is worth putting in.