Originally Posted by mbrick

Yes, it is possible to try to work around it, but that is a lot of steps, time, and heat cycles/run time for the engine. And the heater core is still tough to get all of the air out.

The vacuum tool is a fill and done procedure. Thanks for the detail for those who don't want to use one though.

Originally Posted by SHIFT_Lock

I think it usually comes down to whether or not they have an air compressor already.

Originally Posted by Joethefordguy

so we would need the vacuum fill tool, AND and air compressor?