Only fitting in 3.5 gallons after draining coolant?

[Itsnotme1988]

Working on flushing the cooling system on my 97 k1500 and can only get about 3.5 gallons to squeeze in. drained from heater core and lower radiator hose and filled with bleeder cracked until a steady stream, then closed to finish filling.

Tried last night, gave up and drained today only to find still coolant mixed in (flushing with distilled after lots of water pushing through from a hose just forgot heater core. Pushed a good 15gallons through.)

Am I missing something?

 

[bison]

There will always remain coolant You can't drain in the block below the waterpump inlet unless you drill and tap for and install draincocks on both banks.
Courtesy of the General.

 

[hookedup50]

Thats all I got in mine. After burping it and running it to purge air pockets it took another 3 quarts. This was from a engine swap though.

 

[tanman_2006]

Same here, I usually drain and refill with water. Take a short drive then repeat. Gotta flow through the T Stat. I do this until it looks like straight water then do it one more time. After that I assume I have ~1gal of water in the block and start with water wetter and coolant first and alternate until its full. Usually 2 days later I can squeeze another 1/2 gal in. My mix is usually perfect for my area.

 

[3500GMC]

Try to drain 'nose down'.. It'll let as much as possible run out.

The general did install block drains..... Right under the engine mount brackets..:skep: