Hi BMW members,Today I went back from work and discovered my air cond is little bit warm, even after 10 minutes driving the temperature is still warm. Is there any air cond service workshop that is reliable, reputable and can be trusted to look at my Z3 air cond prob? I send to one shop in USJ but their reason seems ridiculous to me, need to park my car there for 3 days, they want to open up my dashboard, check my wiring, compressor, something-something coil etc..and they told me the cost is 2500++...I seriously think the problem is out of air cond gas, maybe some leakage as well..help needed..