I have a 2003 m3 convertible and the trunk fills up with water
Im not sure if its from rain or car wash but there is at least 2 gallons of water in battery compartmemt and in the area where most cars would have a spare tire. the temperature is below freezing and the water turned to ice causing condensation inside car and electrical problems (lights, locks, dash, trunk etc.)
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Re: I have a 2003 m3 convertible and the trunk fills up...
I'm assuming you checked the seal around the trunk just to make sure it wasn't bumped off track in any way maybe taking groceries out or putting anything in? The car is too new to be suffering from any dry rot I should think. If you drain the water and it comes back I would think the seal around the trunk would be suspect in the matter.
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check the gasket inside your trunk, were it meets your trunk lid first, then if thats ok, pull your spare tire out and make sure the drain holes have the rubber plugs in them,
if you have had an accident and it was in the rear end area, bring it back to the shop that fixed it
oh one more thing, your trunk lid might need to be adjusted, check to see if it lines up, if the gaps around it are all the same, if not, not to adjust it,
There is no drain plug. For the leaks be certain to investigate: sunroof drains, taillight seals, and the trunk seal. Many trunk seals actually channel water into the trunk. New designs are available on many GMs.
This can come from the exhaust. Modern cars use a catalytic converter to reduce emmissions and part of the process can produce water which get s pushed out with the exhaust gases. You mention how large a pool it is. Normal exhaust would produce only a small amount of water.
Another reason could be a bad seal on the trunk which is allowing rain water into the trunk which then drains onto the floor. Check your trunk carpeting for dampness.
Many cars do have drain holes that are along the rain wells, or where the rain flows down around the lip of the trunk. If you pop open the trunk, look along the lip of the trunk for what appears to be craters or indentations along this trail. You may have to run your finger along the rim to find them. Many times they fill with dirt, or other debris and get plugged. This happened to me and I had someone blow them clear with an air hose.