AC replacement in Belgium is 70 Euros.
So not too bad, your prices are ... Norwegian prices unfortunately.
There is a test on the AC system, have you done that? Perhaps is shows errors and that could be of help.
But AC systems need to be used and when old you are not getting away with topping up/replacement every 2-3 years (that is my frequency). Especially for the oil as that keeps the seals healthy (by using the AC at least every quarter but better every month to have 'fresh' oil keeping the seals in a good condition). Put it off too long and it won't work at all and repair is even dearer.
Nothing to do with the interior fan, but if the radiator fan is not working as is should, perhaps it can trigger what you are experiencing.
Don't think so as have no two 75 without AC and fans work as they should.
Rob
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75 KV6 2.5 Sterling automatic, 3x 75 CDT (2 manual + automatic), MG ZT 190+, 620i, SD1 2300S, P6 2000SC & TVR 350i
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