My Hyundai Elite i20(2017 model) was running fine till I gave service in one of the hyundai showroom. Last week I gave my vehicle to service at authorised Hyundai showroom(odometer - 33000km). After giving the vehicle for regular service whenever I depress accelerator I get this loud sound like a race car. Previously it used to run very very silent. one week after this, my car AC is not working well and blows warm air even at the lowest temperature setting (18°C). When I opened the bonnet, I can see that the car compressor's clutch is always engaged and never disengage even when AC is switched off. Can anyone tell me what could be the actual problem? Is the compressor gone bad?