My cousin who knows a lot more than l basically did this . He cracked the housing and bled it off this way and it worked a while. He did it several times and it lasted a mnth. So basically it seems somehow after a mnth of running l pull air somehow and have to deal with this again. Is my fluid getting too low and then sucking air? Not sure . For now l am gonna pull the bleed bolt again and do it several times and see if l can get all the air out. This MUST be what's wrong from everything l have read. When l change the thermostat out it seems to resolve for a while. But not always. Now lm using the bleeder bolt and seeing if this is a better location at higher level above the thermostat level to get it all out. Fingers crossed.