I doubt you need better pump then 655B for your set up.
I seems that something is blocking the flow and my money on air lock. I would try following:
1. Try to tilt case to the back so radiator will have more horizontal position (if there is air lock it should break). Squishing tube helps (just remove useless untikinking coils before squishing ) Shake and bang the case. Switch pump off and on (with pause) to help with breaking air lock.
2. Double check that no tubing is simply bent
3. Start problem isolation. Bypass big radiator and see if that will work, then small rad.
Let me know..........
I seems that something is blocking the flow and my money on air lock. I would try following:
1. Try to tilt case to the back so radiator will have more horizontal position (if there is air lock it should break). Squishing tube helps (just remove useless untikinking coils before squishing ) Shake and bang the case. Switch pump off and on (with pause) to help with breaking air lock.
2. Double check that no tubing is simply bent
3. Start problem isolation. Bypass big radiator and see if that will work, then small rad.
Let me know..........
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