...It is My Opinion, Air in the System is Not Your Problem! Your Problem is, The 'Radiator' cap is NOT holding the PRESSURE. Not even close! I Run a 16 LB Cap. I've never done the 'raise the front, raise the rear'. Never had to. I just bleed the air out, at the Top Left corner of the Radiator. Nor, have I done the 'Hosed System Re-Route', Modification.
Most important is to have the 'Pressure Tank' (the Short One) Raised up Higher, with the Top Most Level of Coolant 3 Inches Higher than the Top of the Valve covers (See in Pic). This gives a 'Highest Chamber' for All air to Accumulate. And where the Air will be 'Burped-Out' into the Recovery tank, BEFORE the coolant. Then Upon Cooling Down, the Correct Cap is Designed to Allow a Reverse Flow of Coolant from the Recovery Tank Back into the Pressure Tank...FREE of Air.
If I should open the Cap on the Short Tank...When all is Cold, Coolant spills-Out, as there is NO Air in the Tank, at all, Because the Recovery system from the Over-Flow Tank, is working Perfectly. The Caps on Your Tanks May Not Do This.
The Sounds You are Hearing are Coolant Boiling into STEAM, because the System can Not hold the Pressure, which would PREVENT This from Happening. Last...all that 'Mud' spilling out of the CAP, Should Tell You, the System needs a Complete 'Flush-Out'. And then, get some 'Anti-Boil' mixed in Distilled Water (NOT DE-Ionized Water!) 50%-50%. I do a Ratio of Aprox. 40% Glycol-60% Water.
MJ
P.S. Double Clamp Every Hose End, Just a Recommendation, this will save You a lot of Heartache in the Future.
