Yes, your air con needs a recharge.
You do not need a new EGR, just put on some plastic gloves and give it a good clean and then leave the small flexible vacuum hose off with the end blocked off (there is no need to block the pipe fitting on the EGR itself). This means that it will not need cleaning again. The temperature guage should read at 9 0clock when warmed up but is only a very rough indicator of correct temperature ( it will read there between 74C and over 100C). Search for the 'in-hose'
mod.......a little work and less than £10 will solve that problem. this link gives you an idea of what is involved. I was the first to fit an additional stat' to the 75 diesels and it will be three years next October without any problems.
http://www.the75andztclub.co.uk/foru...t+renault+stat