i had the same problem with my f22b. i tried all kinds of stuff to get it to go away, finally one day it did. On the fxxb motors the iac is higher than the radiator cap and the bleeder. i think the air pocket that was in there finally bled out. I came up with an idea that might work you can try it for me. lol.
-remove neg battery cable
-take the iac and fitv(if equipt) off of the IM and let it hang lower than the bleeder and make sure the hoses aren't kinked.
-crack your bleeder open and start filling your coolant.
-Once it is full close the bleeder and replace the cap
-put your iac and fitv back on and replace the battery cable
-fire up your ride and let it run for 5 or 10 minutes and recheck coolant oh and don't forget to fill up your overflow.
-if it works pm me so i can do a write up.
-remove neg battery cable
-take the iac and fitv(if equipt) off of the IM and let it hang lower than the bleeder and make sure the hoses aren't kinked.
-crack your bleeder open and start filling your coolant.
-Once it is full close the bleeder and replace the cap
-put your iac and fitv back on and replace the battery cable
-fire up your ride and let it run for 5 or 10 minutes and recheck coolant oh and don't forget to fill up your overflow.
-if it works pm me so i can do a write up.
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