I had a job where all of us were ordered to take a random within 24hrs due to a suspected thief among us and we were allowed to go alone.The heat pad that came with my qf 5.7 seemed to be inferior to the hand warmers I buy now at my local 7-11 or gas station mini mart (pkg with 2 costed $1.29) and they are bigger and work great.Without access to micro or a car defroster maybe a hot coffee or if you could go in a bathroom and run the hot water on it until its warmer then add heat pad and crotch it.