> i don't think using 100% coolant will cause the engine to take a longer time reaching operating temperature. pure ethylene glycol has a higher boiling point, but that won't mean the engine will take longer to reach the proper temperature (since the operating temp of the engine isn't dictated by the boiling point of the coolant; the engine doesn't reach proper operating temp by boiling the coolant).

i stand corrected and you're right. the engine cooling system has its own temp threshold that activates the circulation of the coolant or water mixture. thanks for the info!