Dina_DJ, I think ok lang nman yung aircon kahit malamig pa makina...ang importante do not labor the engine when it is cold. OR in the safer side, NEVER labor your engine malamig man or normal temp.

fast69, depende yan sa kotse. Sa mga lumang kotse required talaga na i-warm up muna.

Para naman sa mga performance-modified engines, ibang istorya na ito..better consult your performance shops.