When it rain hard my 2008 cadillac cts trunk lid fills with water then it leaks into the spare tire well

honeymokey

• 3113 Answers
• Posted on Apr 17, 2009

SOURCE: 1991 cadillac eldorado trunk lid pull down fuse

Try number 13. center of fuse block labeled deck lid. To fix the problem you will need a pull down switch. The always go bad from people slamming the trunk shut. See you gm dealer for this part.

Mark T

• 776 Answers
• Posted on Nov 17, 2009

SOURCE: how do i program a spare key for the 2006 cadillac

Take it to a Cadillac dealer. The dealer uses a Tech II (computer) to reprogram your car to recognize the new key fob.

SOURCE: Need to replace water pump on a 03 Cadillac cts I

I do not mean to be hurtful and it will take some time to do. Maybe all day if you have no experience. If you need instructions just maybe you should have some do it for you.

SOURCE: Found water in trunk with spare tire in 1999

After 11 years of use you can pretty much expect this as the trunk and lighting seals harden/shrink with age.

I'm based in the UK so I'm totally unfamiliar with the Eldorado, the following advice is generic to the many makes and models which suffer the same common fault.

Check the trunk lip seal for any damage or gaps. If damaged then you must replace the seal, but if there's a gap between two ends then it may be possible to gently work each end along until they comfortably meet. Start at least 18" each side of the gap to massage the seal along its length in the direction you need to shift it. Pulling on the end of the seal will either damage it or will just temporarily stretch it. If you cannot easily close the gap, renew the complete seal. Some folks advise smearing Vaseline (petroleum jelly) onto lip seals to help make them watertight, but don't. Many of these seals contain a proportion of natural rubber and mineral-oil based products corrode them. They're intended to work without any goop smeared onto them, but if you're on a tight budget then a hardened seal can be temporarily improved by smearing silicone grease onto it, but if you lean over the lip and get it on your clothes then you will understand why the seals are designed to work without additives.

Next, pull out the spare tire and check to see if the recess has any open drainage holes. If it has, then they've lost their rubber blanking plugs: the holes are only there to allow drainage of paint and chemicals used when the car body was being manufactured. If they do have rubber plugs then double check that they are not damaged and that the metal around the hole is not corroded. You may have to temporarily remove the plug in order to do this properly. Also check any other through -body plugs or grommets (allow cables and wires to pass through) in a similar fashion.

The final step is to check the seals around the lighting clusters. You can either remove the clusters and visually inspect the seals (it's often easiest to simply replace them as a matter of course) or you can thoroughly dry the inside of the trunk, and then sprinkle a dusting of talc, chalk or even flour around the inside of the trunk on the bodywork around where the cluster sits. Use the sprinkler head on a watering can or hosepipe to deposit water onto the cluster from all angles (close the trunk first!). Any leakage may show on the dusting powder and you can then trace the source, but this method is not always entirely dependable so I always opt to remove the clusters. When replacing the clusters, tighten the fasteners evenly to avoid distorting the cluster/body panel and I always smear silicone grease on the sealing faces.

Silicone grease is sold at plumbing shops as "o-ring lubricant" and also at diving shops where the same stuff is sold in tiny tubes for a far higher price as it's certified as food grade (non-toxic). Both are the same though apart from the expensive certification by the manufacturer. Do not use silicone sealant as used for sealing bath tubs, kitchen sinks and shower trays. This gives off corrosive acetic acid as it cures and will corrode any metalwork it touches.

Note that one other common cause is incorrect use of a pressure washer. High power jets directed straight at panel shut line and around lighting clusters can easily leak in as the pressure far exceeds what they were designed to resist.

I hop e that I've helped and provided some useful suggestions. Please take a moment to rate my reply.