Main question:
Does anyone know where the air bleeder valve is for the coolant system? I have attached a picture to show how the coolant system and engine looks.

In depth description:
I replaced the radiator, water pump, and thermostat. When refilling the coolant I cannot get all of the air out of the system. I have tried jacking the front end up and doing everything recommended online for burping cooling systems. I even bought a pressure tester and tested the system. It holds pressure (I pumped it up to slightly higher than 16psi and it stayed there for 30min), so there are no leaks. I know that there are vacuum systems to pull the air out and add the coolant without air, but my compressor is broken, so if I could just find the bleed screw that would solve my issues.



Where the thermostat outputs to the radiator (big hose that ends up going to the top of the radiator) and heater core. I cannot see a bleeder valve there. For reference that's on the passenger side and that's the alternator you see there to the right.

 

Hello greeny5155,

There are no "bleeders".
I had a 5.2 Magnum powered '97 LTD ZJ which I gave to my Eldest Son. The PITA will be/when the blend door fails and one has to pull the dash to resolve it.

 

Thank you for your reply.

I've come to the conclusion that there is probably a crack in one of the head gaskets. I have gotten about the same amount of coolant into the system as came out when I emptied it and there is still air (can still hear the gurgling in the heater core). Also, it won't accept any more coolant. I can see bubbles in the funnel when I rev, but the coolant level never goes down which makes me think that it's basically full and the head gasket is pushing air into it, but no more coolant is being accepted because it is already full.

 

I have the same behaviour in my 5.2 zj, i can hear "grugling" sounds one in a while and when filling the tank, it's completely full, but occasionally getting bubbles. Lately started to have some random coolant leaks in the mix, today, second time, threw off the top radiator hose from the bracket (overpressure?). Tried filling it for 1.5h from cold start with open cap, same thing, engine is warm, radiator full. No idea wheres the problem. Did u find anything? Though, my jeep has done the grugling sound since beginning but now with the leaks started to check deeper as previous owner said it's okay lol