I have just bought a 2002 RR VOUGE SE the air con doesn't come on i was told by a garage last week that its common to go but needs a part costing £80 before i get it regassed can anyone tell me what the common leaky part is called thanks

Hello all this is my first post so go easy just bought an 02 RR Vouge p38 se with the sound not working its a Harman Kardon system i saw a nokia mic from a hands free kit and found the box in pasenger side footwell removed all associated parts the main power wires go all the way back to the...