First priority has to be to fix any leaks, as you have already decided to change the light seals, I would also use sealant as well, there is a small area that the gasket doesn't cover, to double ensure the boot stays watertight, engine bay, how far do you want to go, a good degreasing spray and hose off often works wonders, but be very careful where you aim the hose, as Artic has already instructed test the slow speed fan, if the fans toast its a front end off job, not hard, but its quite involved often brushed having worn out is the culprit.
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