My wife owns a Isuzu Ascender (rebadged TB/Envoy), and there's some whine. I know about the tensioner pulleys, idler, power steering pumps, etc.., but would it be safe to start the engine w/o the drivebelt installed? I'm trying to pinpoint a noise and want to remove it to see if the noise goes away indicating it's one of the pulley's or components connected to the drivebelt. Should I limit the amount of time the engine is on (since it could overheat because fan not attached)? Any other precautions I should take before starting it (like disconnect any component or turn off certain things)?