Need help guys! Very minimal amount of heat coming out of my system(almost none). I have topped up coolant, replaced thermostat, and checked lines leading to and coming from heating core and both are hot at operating heat level. The blower motor is working right as well as the designated direction for air flow in cabin. What am I missing as to why no heat is coming out? Current temp is -18 C and cannot take my kids anywhere like this, let alone the fact that I work all midnight freezing cold to drive shift work...lol. Please help someone?