4.3 GL-D carbureted.

[krazykatz911]

What is the best way to get RV antifreeze through the whole block without issues of getting thermostat to open?

i have been using the 5 gallon Jug of rv antifreeze using earmuffs but it always seems I end up overheating the impeller. Couple of times the impeller housing got red hot. Ughhh.

I always run rv antifreeze through and then drain the block plugs, intake and exhaust manifolds and then store.

thanks in advance

 

[Scott Danforth]

first, you drain the block, heads, exhaust manifold, raw water hose, large J hose and the thermostat cross over on the intake like the manual states

then if you want to add antifreeze, you use a funnel and pour antifreeze into the thermostat housing like the manual states

you need to drain first to get the water and crud out prior to adding antifreeze