I'm at a loss for what to do on my 318 overheating after major repair.
Ok, here's the story. I have just recently put on a head and refreshed all the gaskets on the M42. I have replaced the water pump, thermostat, and radiator. I have done the mess under the intake fix. The PO had looped the heater core due to it leaking, and I haven't replaced it yet, so I have run a hose from the large rear port on head to the rear of the plastic coolant pipe. I have run a hose from the small head port to the plastic coolant pipe as well. The middle port on the plastic pipe runs to the bottom of the expansion tank as before. I've got a working electric fan hooked up to a manual switch for the time being.
My procedure so far:
Jack up front of car.
Fill expansion tank with bleed screw removed, and keep filling until no more bubbles come out of bleed hole. Suck out water until back at cold level mark.
Start car and run until gauge is @ 1/2. Upper hose is hot, lower hose is warm/hot, thermostat is open.
Rev up to 3k, open bleed screw...no coolant even close to coming out. I can squeeze the lower hose and get a little spray, but nothing when engine is revved. The expansion tank level does drop a bit when revved, so I am pretty positive the pump is working.
No flow of coolant is coming out of the little hole under the expansion tank. Every BMW I've ever worked on streams out coolant from the hole under the cap when revved. Which I have never seen before.
I hooked up my pressure tester to the ex. tank and pumped it up to 15 psi, crack the bleed screw and then I do get coolant out of the hole, but still none when revved.
I let it run long enough and the temp will creep to 3/4 and when I shut it off the upper rad hose boils.
I've tried filling the rad hoses before starting as well.
The only variable is that I had this same issue with the original head after replacing the head gasket. So I figured it was cracked and got another one which I did not have tested before install, but it was off a solid runner from a legit seller. However, at this time I do not have combustion gases in the expansion tank.
I'm baffled guys, I work on BMW's all day, every day for a living, and I have never had this much difficulty with a cooling system!
Anyone have any ideas on what I can check? Encouragement? Offers for a niceish 318is?
Sorry for the lengthy post, just trying to make sure I didn't leave anything out.
Thanks.
Ok, here's the story. I have just recently put on a head and refreshed all the gaskets on the M42. I have replaced the water pump, thermostat, and radiator. I have done the mess under the intake fix. The PO had looped the heater core due to it leaking, and I haven't replaced it yet, so I have run a hose from the large rear port on head to the rear of the plastic coolant pipe. I have run a hose from the small head port to the plastic coolant pipe as well. The middle port on the plastic pipe runs to the bottom of the expansion tank as before. I've got a working electric fan hooked up to a manual switch for the time being.
My procedure so far:
Jack up front of car.
Fill expansion tank with bleed screw removed, and keep filling until no more bubbles come out of bleed hole. Suck out water until back at cold level mark.
Start car and run until gauge is @ 1/2. Upper hose is hot, lower hose is warm/hot, thermostat is open.
Rev up to 3k, open bleed screw...no coolant even close to coming out. I can squeeze the lower hose and get a little spray, but nothing when engine is revved. The expansion tank level does drop a bit when revved, so I am pretty positive the pump is working.
No flow of coolant is coming out of the little hole under the expansion tank. Every BMW I've ever worked on streams out coolant from the hole under the cap when revved. Which I have never seen before.
I hooked up my pressure tester to the ex. tank and pumped it up to 15 psi, crack the bleed screw and then I do get coolant out of the hole, but still none when revved.
I let it run long enough and the temp will creep to 3/4 and when I shut it off the upper rad hose boils.
I've tried filling the rad hoses before starting as well.
The only variable is that I had this same issue with the original head after replacing the head gasket. So I figured it was cracked and got another one which I did not have tested before install, but it was off a solid runner from a legit seller. However, at this time I do not have combustion gases in the expansion tank.
I'm baffled guys, I work on BMW's all day, every day for a living, and I have never had this much difficulty with a cooling system!
Anyone have any ideas on what I can check? Encouragement? Offers for a niceish 318is?
Sorry for the lengthy post, just trying to make sure I didn't leave anything out.
Thanks.
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