My Cultus model 2011 started reducing coolant water, the coolant on the reservoir bottle going to low level. It never happened in last 7 years with 83000km on ODO. i got it tuned from Suzuki 3S at 80,000km. Recent changes made to the car was changing of timing belt, ac belt, timing bearing and water pump. this all was done from a local workshop. rest of all the work has been done from 3s dealership always. Can anybody tell me the reason behind reducing of coolant. I filled twice but it still reducing.