I've had good luck filling the (Toyota) cooling system by loosening the hose clamp on the upper radiator hose and sliding a screwdriver between the hose and neck to let the air out. I've never had to burp after that.
Are the V8's more difficult?
Georg mentioned one of these...
Lisle 24680 Spill-Free Funnel https://www.amazon.com/dp/B00A6AS6LY/ref=cm_sw_r_awd_gTQ4ub0T1N54D
https://www.amazon.com/dp/B00A6AS6LY/ref=cm_sw_r_awd_gTQ4ub0T1N54D
I can say the 5.7 vortec wants to get a big air pocket in the engine for some reason when the coolant is drained...I'm sure this is not unique to the 5.7 or V8's, but it seemed to take forever in bleeding the system and at the time I was not seeing the thermostat cycle...so the process above is what I do....basically filling the system with as much coolant as it will take and then filling the engine as far as it will go (through the water neck on the intake) and then starting from there. I find that this works best for me or my setup...the engine holds a good bit of coolant by itself.
(I take the thermostat housing/water neck & thermostat out) and fill up through the resulting "hole" in the intake, makes the process work so much faster. Of course it might be smart to install some type of bleeder in the cooling system but I've not gotten to that level.
I let my truck run 30 min or more and kept seeing temp spikes on the gauge (false readings based on air pockets) and I knew for sure the thermostat was not cycling...so the above solved it for me.
Yes I need to get one of those funnels too.
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