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Looking at the front of my disco, with the light and bull bar, there really isn't good flow for air to the radiator so i'm wondering if i should change it somehow.
Between the grill and the radiator is the condenser, looks kinda like a thin raditor, has very fine fins which over time can clog easily, cutting air flow to the radiator
I usually give it a hit with a can of degreaser just to loosen any crap and then clean it with my small pressure washer, it's just right , not to powerful.
Best to remove the radiator to do this although i just unbolted the raditor with the hoses still on and was able to make a gap between the radiator and condenser, did this to save my new coolant, otherwise i would of just removed it.
Also this was on a petrol RRC, but most vehicles with aircon have a condenser in front of the radiator,
Check your viscous fan also as suggested!
good luck
