Join Date: Jul 2005
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Anything's possible with the bonnet open. Yes, they may have damaged the air-con, though these things can happen spontaneously too.
My second Lag I sprung a leak in the air-con for no apparent reason one day. I noticed the faint hissing when I parked it up one night, and the following morning, the 'SERV' indicator was lit on the climate panel and I had no cooling.
How close were the two events? Get it regassed (or DIY it if possible) and see how long the new charge lasts. If it lasts as long as the time between your dealer fixing the Top Dead Centre and you first experiencing the fault, then use this as evidence that the dealer broke it while they were working on the car.
Currently in Horatio's garage:
2010 Laguna III Initiale.