"Correction"

I drive a 2002 Renault Scenic 1.8 and. It is a very comfortable small van and good handling on the German Autobahns. However, the LCD Display shows false readings from time to time and there is a steady hissing to whistling sound coming from around the break peddle area from inside the vehicle, even though I recently had repaired the breaking system. Additionally, the Navigation and Radio system went out during jumping "starthilfe" and I cannot find a Dealer or Garage to find or fix the problem without scaring me with a 1600 plus Euro repair cost. I find it difficult to believe that a Radio / Navigation System would be totally destroyed just because I had it jump started (starthilfe) and if that is the case, then I certainly would not want to purchase another Renault Scenic no matter what year it was built. Information on the repair or even troubleshooting is seems almost impossible to find on this 2002 Renault Scenic 1.8 Liter Engine. I would appreciate help on where I can have the Radio / Navigation check or fixed at a reasonable cost. Thanking your in advance for any assistance you may have. Kind Regards to the reader.