bai -- i dont know if this is relevant to your query but here goes. i used to drive a box type corona (yep the 90s macho machine model but it was 4 door model lang) and it had a bad bad vibration problem that always happens whenever the aircon was turned on. there was no problem with the aircon though as it was still cold

it turned out that kulang sa support or dampeners ang area around the compressor. i never got to fix it though and just sold the car

basig mao ni ang problema nimo?