i have a mazda, 2.0 ts6. reg 03. how do i locate the recharge valve, so i can use my air con recharge kit; i have located 2 valves .they both have blue dust caps on them one with, h,on top the other with ,L, on top .are these the ones i use, if so ,which one do i use.

anthony, July 2013

Yes you have located the top up valves. With the engine not running the whole circuit should be the same pressure so it should make no difference to which one you use. Personally, I would get it done professionally, as you could be under/over adding and your kit can only add so any moisture in your circuit will remain.

Vince, July 2013