Hi, this is my first post, sorry to start with a question. My C4 VTS 2006 aircon isn't blowing cold, I get hot air and cool air (both sides) but switching on the aircon on seems to make no difference at all, i've checked both the fuses under the bonnet and the glove box, although they had brown marks on them the fuses look intact, is there anything else I can check before getting it re-gassed? cheers