This is such a common problem with renaults of that age , and to be honest your Renault garage should be well aware of it ,phone 08000 723372 and speak to renault customer services and tell them about your problem your dealership name etc, i take it you had the work done at a renault dealer which means its under warranty as i think they have not did the job correctly ,you will get put intouch with with a customer service guy who takes your problem on and acts as a 3rd party to sort out your problem with your car with your renault dealer and keeps you up to date with going ons as well as telling then the most likly cause , these guys seem to have a amazing effect on there dealerships .Hope you get it sorted soon
Bigdave70
August 2010