I started getting a lot of air from what I assume are exhaust gases into my coolant after I replaced a head gasket. I’m really scratching my head at the source of this air because it’s a lot of air very quickly. A full radiator of coolant can be displaced and the coolant shoots out around the overflow reservoir cap within 20 minutes of driving … any ideas of where I look next that are not head gasket would be helpful

 

It’s a 2006 RL J35

 

bleed the system. If that doesn’t work , you have to diagnose where air is coming in feom

 

Ya gotta burp it---like a baby.

 

Assuming you have already bled the system properly, use this to test whether the air is indeed exhaust gas (it almost certainly is though, because it's the only source of gas that has enough pressure to force itself into the cooling system).

It can only really be one of the head gaskets or a cracked block/head ... although I noticed the RL incorporates the exhaust manifold into the cooling system, so I suppose a crack in that manifold (or a failed gasket there ?) could also let the two mix.