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Leaks – Roadster

Mod Description
It is not a secret, the roadster can leak from one of about ten places and each one has its own fix. Not owning a Roadster I don't have first hand of these leaks but I will try to bring you a bit of info as and when I come across it.
Mod Details
PremiumNo Difficulty Mod ID374 CreditEvilution For452 Roadster Link Copy to Clipboard

Roadster Leak Appendix

Here is a list of link to all of the leak fixes, repairs, ideas and guides on this site.

Leak Detection
Official Leak Guide
Rubber Seal Care
Waterproofing The SAM Unit
Roadster Bonnet Removal
Roadster Carpet Removal
Roadster Roof Drain Spout
Roadster Sagging Doors
Door Seal Drain Reinforcement
Roadster Rear Roof Leak
Roadster Exterior Water Channels
Roadster Wiper Motor Sealing
Roadster Wing Mirror Leaks
Roadster AC Drain
Roadster Scuttle Tray Leak

What Is The Problem?

If you don’t ever look for leaks or see any obvious signs of water ingress, the first thing you will probably know about the problem is when the car goes mental. Water gets into the electrics and cause problems such as the wipers not stopping, the horn not working or working when it shouldn’t, the gearbox playing up, headlights flashing or not working, unusual lights appearing on the dashboard etc. The worst problem is that the car just will not start.

Generally this means it is time to get a new SAM unit which isn’t cheap and unless you have the leak fixed, it will soon happen again. You could be throwing money away.

Drying The SAM Unit

If your car doesn’t start, you really have nothing to lose, you may as well try to dry it out. Firstly, I don’t suggest sticking it in the oven, or using a hot air gun on it. Depending on your talent…

Disconnect the battery and remove the SAM unit from the car
Don’t attempt to dry it in the car.

You have 3 sensible options to removing the moisture.

Try gently heating it up evenly with a hair dryer on the lowest setting, This should evaporate any moisture inside.

Stick the SAM into a pillow case and zip tie the end closed. Place it in a plastic bag with a load of uncooked rice and seal the bag.
Place this in your airing cupboard or in a sunny place for as long as you can. The water should evaporate and be drawn out and held in the rice.

The best way is to open the SAM unit casing, clean the PCB with electrical cleaner spray, Visually check the PCB for water damage and corrosion before putting it all back together.

Refit and see if that has helped at all. Now try to find the leak that caused the problem. If the dried out SAM works then consider waterproofing it.

Leaks And The Problems

The obvious problem with water getting into the car is the soggy carpet, initially it’s very hard to spot unless you lift it up and feel underneath. The results can range anywhere between slightly damp and swimming. After that first problem you get the extra problem of the smell that will eventually occur and removing the carpet for drying isn’t an easy task.

If your wing mirror seals leak you can look forward to soggy speakers which don’t tend to work for long, plus the door card fabric can suffer badly from water marks.

Roof seal leaks can drip onto the seats which again cause water marks and are very hard to dry out due to the expanse of foam used in each one. The first sign is a wet bum.

Boot and rear window seals on the coupe have been known to leak too but not as common, this can fill the boot with a nice hidden puddle causing damage and a bad smell before you realise.

The bulkhead leak is a tricky one as you can’t see it and the ingress area is big. During manufacture, the bulkhead between the engine and the cabin is well sealed using an automotive mastic product, this is common on many makes of car. The problem occurs because smart sprayed the tridion before the sealant had a chance to dry and as a result the sealant is partially washed away or displaced.

The scuttle tray leak is the one that does the most damage. Under the windscreen wiper motor is a plastic tray, this is mirrored on the other side of the car with the air inlet tray. The drain ports very rarely get blocked so it’s unlikely that the tray will fill up. The problem
is that the seal used between the wiper tray and the body is very poor at stopping water. It’s a closed foam rubber strip but it’s not under much pressure and has been known to move out of its seating channel.

Water running over the top of the scuttle tray seal would normally drip into the footwell but due to the amount of wiring in that area the water almost always ends up running down a few wires.

To make matters worse, one of the lowest points is the SAM unit (fuse box). The water obeys gravity and drips into it causing a host of electrical malfunctions. Once the SAM unit is water damaged, the only option is to replace it at a cost of over £400.

Replacing the SAM unit is just delaying the inevitable, without the leaks fixed, the new SAM unit will fall foul of the water again.

Can You Help?

Do you have any information on the subject of leaks or the fixing of them that you would like to share? If so please contact me using the contact page.

Every submission is credited to the person who sent it or the originator. I have no interest in taking the credit for other people’s work.