Originally Posted by mk378
Don't you have a mess when the purge is complete and there is extra coolant in the funnel? How do you not spill that?
The vacuum filler Puts the cooling system under vacuum. Then you close off the vacuum pump and let the vacuum suck in coolant.
Really most cars do fine with the old fashioned topping up the radiator while the engine is running method.
Many of the cars I work (Euro stuff) on cannot be filled properly with a funnel, any funnel. they will begin to overheat in a few min and not show it on the gauge because the gauge is in air not liquid as it should be and as a side not the electric fans may not come on either.
Back in the day we used a hand vacuum pump on the bottle return to draw the coolant into the block or fill the block through a heater hose, A PITA really.