[BILL WILLIAMSON]

With a perfectly sealed cap & a LARGE enough overflow tank, hosed to the overflow tube, you can keep the radiator VIRTUALLY FULL. Thus increasing the water capacity & eliminating AIR BUBBLES & increasing the EFFICIENCY of the system!
The INVENTOR of the QUICK, add-on system was a mechanic for Navajo Truck Lines, in the Southwest. Trucks were running HOT! By adding a clear plastic tube in the upper hose, he determined that FOAM & BUBBLES were the CULPRIT!
After setting up the tank system, the water ran CLEAR & they ran COOLER!!!
I was in the "heyday' of these add-on tanks & I do KNOW what I'm TALKIN' about.
Bill Restofthestory