Sence I bought my 61 several months ago, and it has always run nice, I have spent very little time under the hood, so i never noticed this before. It takes a long time for the engine to warm up and it overheats on long drives over 60 MPH. Figured it doesn't have a thermostat and for all I know, that MIGHT affect temps on the highway also[?]. Pulled off the thernostat housing and it has a good working thermostat. Then I noticed it has a hose off the bottom of the radiator. It runs up to an inline pump or heater[has regular 115 Volt plug] that's mounted to the firewall. From there the hose goes into a T on the driverside heater hose. What is this hose for? Could the water be bypassing the thermostat making it take longer to heat? Might it be flowing by at higher speeds and not spending as much time in the radiator? Is this a factory set up? If its not, where should this hose go?