Apologies for delay, tried to post several times today, something was funky.
First off, make sure your radiator is not restricted....run a hose in the top (with all radiator hoses off) and see if the water runs freely through and out the bottom. If it doesn't you need a radiator. If it does:
Reconnect lower hose - with spring inside. Lower hose has vacuum since flow through radiator is top to bottom.
Fill radiator with water. Start engine. Let the thermostat open several times until water comes clear out of upper hose. Make sure upper hose pointed in safe directions. Keep radiator full.
Once water runs clear, shut off engine. Drain radiator and reattach upper hose. Fill radiator with 100% coolant, do the math so you get close to 50/50 in the entire system.
Run engine again, with radiator cap off. Probably want to have the front of the vehicle higher than the rear, to help air bubbles escape the system. Keep raditor filled as bubbles come out. Once the thermostat has cycled a couple of times with no bubbles, put the cap back on and fill the reservoir.