my heater fan stopped working in -30C, how to fix

What is your question?

after the truck got warm the fan started working again.the shop advised to put in heated garage overnite and it would fix it, will this work. when the vehicle sits for a prolonged period(over 8hrs)in this freezing weather, it won't work until the interior warms up...using a space heater. it is that time of year where the temp will be -20c or colder, plus windchill.