Start the engine and keep it running the entire time, but wait until it reaches normal operating temperature before you check it out. (marinochryslerjeepdodge.net)
This may cause other engine problems relating to the engine not warming up properly to run at normal operating temperature. (yourmechanic.com)
In colder temperatures, warm up your engine by driving at a slower speed until the engine achieves normal operating temperature. (drive-safely.net)