Yeah, it's possible that it needs some topping up.
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Personally, I'd start with a thorough cleaning of the radiator and the front dust filters of the case. You can do this with an old paintbrush (to loosen the dust more easily) and a vacuum cleaner held to where you're brushing. Alternatively, if you have a can of compressed air or some kind of air blower, take the whole rig outside or onto the balcony and blow the dust out that way.
So where are things connected? Where do the pump and the radiator fan cables go to?