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sedan truck lid latch acting up in freezing weather 200 1988

After a freezing rain, the trunk lock was frozen so I used the electronic central unlock from the driver's door.
The trunk opened but the latch would not catch when closed.

I thought it was ice in the lock but there have been enough intervals of warm thawing to have gotten rid of it and the condition comes and goes seemingly with freezing conditions without snow or rain.

latching conditions:
- trunk is latched (no snow or ice but freezing conditions), I open it, it will not latch when closed
- trunk is unlatched and I use the truck key to lock it and it latches (but no always)
- trunk is unlatched and I use the front door electronic central lock to lock it and it latches (but no always)
- trunk is latched and as I drive down the road I hear tapping that is the trunk lid moving due to the latch having released.
- trunk is unlatched and there is nothing I can do to latch it.

These condition are intermittent not progressive or if they are progressive I have not put it together yet.
The trunk is currently latched.

Clues?
Thank you
--
1988 244 DL; B230F; LH-2.2; Manual 5-speed (M47)








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    sedan truck lid latch acting up in freezing weather 200 1988

    The rear of the car leads a tough life. It gets plenty of dirt in road spray and almost never gets a nice wash of rain.

    My only experience with latch problems only comes with wagons, but perhaps internal corrosion is your problem.

    Does the little door in the key slot close properly?

    If you can, you should remove and disassemble everything.

    In our '88 GLE 745, about a dozen years ago, I had to wire brush and sand some parts to remove corrosion. Then I lubed everything well.

    The latch may have so much corrosion that its springs cannot close it.

    Get a spare set of parts at a junk yard and rebuild them?








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    sedan truck lid latch acting up in freezing weather 200 1988

    I had a bad feeling about spraying anything sticky (oily) into my key locks that would hold dirt (lint) in the lock.

    Graphite was the method of choice for door locks before all the fancy sprays. It took some looking but I found Lock-Ease; graphited, Lock Fluid. It is what I consider a dry lubricant. As best as I was able to find out it is graphite in alcohol delivered by an aerosol mix. The graphite mixed in alcohol is delivered under pressure by the aerosol to seep into all the sliding surfaces, then the delivery system evaporates.

    Truck lock has worked so far. I will not swear by this fix until we have another season of freezing weather.

    I also found this worked wonders on the latch at the open end of the driver's door - no more still, hard to pull handle.
    --
    1988 244 DL; B230F; LH-2.2; Manual 5-speed (M47)








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    sedan truck lid latch acting up in freezing weather 200 1988

    WD40 or White Lithium grease on the latch mechanism. done.








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      sedan truck lid latch acting up in freezing weather 200 1988

      Yes, just sounds like a good service is needed. WD-40 might be OK for cleaning everything up but useless for lubrication. Use the lithium grease after it's clean and free moving. Do all of your lock mechanisms while you're at it.







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