Stuck linkages are the number one problem in non-working sunroofs.  These linkages easily corrode and stick to their guide tubes.  There isn't very much clearance between the linkages and the guide tubes; exposure to crud and moisture just makes things worse.  Once the linkage is frozen in the guide tube, it's a pain to cut the guide tube open to salvage the linkage.  Most times, the linkage is very rusty, so reusing them is not recommended.  Good, used sunroof assemblies are plentiful and relatively cheap.  It is recommended to get a good used linkage (and guide tube) to replace your bad one, if this is the case.  You can form your own replacement guide tube out of ¼" O.D. copper tubing, easily obtained from most hardware stores.

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