Bleeding a Heater Core?
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"Or you can just open the hose connections, and pull forward, and wait on bubbles to stop..... " Did that too only without the boat but that didn't get it all either.
My much maligned piinch and surge technique seemed to be the most effective of all the things I tried, but there was still some air trapped in the core. I probably just need to get the thing out and run it with the engine above 2,500 rpms for a while to get the rate of coolant flow up and force the air out. I haven't had a chance to drive it any distance on the highway so I'll give that a try.
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And here I've been trying to stay out of the ditches. Anyway, seems like I got rid of the last of the "waterfall." Took it for a 25 mile trip at 75 to 80 mph and the sound is now gone. Having never emptied the heater core before, I was worried about what would happen as that air bubble moved into the rest of the cooling system but the temp gauge stayed around 190 for hte entire trip and the heat was working awesome so I should be all set. Maybe one more check at the bleed screw and I'll be done with mopping up green stuff for a while.
For anyone that replaces a heater core or empties it by blowing it out, when you refill the system follow the standard bleeding procedure and then take it out and drive it like you stole it to purge the last bit of air from the heater core. Pinching off the heater core return hose and releasing it emptied the bulk of the air but running it on the highway finished the job.
For anyone that replaces a heater core or empties it by blowing it out, when you refill the system follow the standard bleeding procedure and then take it out and drive it like you stole it to purge the last bit of air from the heater core. Pinching off the heater core return hose and releasing it emptied the bulk of the air but running it on the highway finished the job.