I had the same problem. What finally worked for me was to tee in a
bottle (I used a regular coolant overflow bottle) to the line leading to
the pump. I also have a brass tee with a plug at the highest point in
the system in the line leading from the tank. I opened that to let air out.
First I pulled the outlet hose on the tank (mine is on top) and filled
the tank up. Reattached the hose and filled the coolant bottle. Then I
disconnected the heating elements and just ran the pump. I kept the
coolant bottle filled. Eventually fluid started splashing around in the
brass tee. I loosely put the cap back on and kept filling until it was
oozing steadly. Sealed it up and reconnected the heating elements.
--Rick
On 10/18/2014 10:58 PM, Al via EV wrote:
It's that time of year, time to get the heater installed in my EV.
It consists of a 3kW tank heater, a 12V solar pump, piped to the OEM
heater core.
My problem? I can't figure out why it is so damn hard to get the air out
of the system.
The tank and the pump are down low, the heater core about 6 inches above.
My first guess was that a simple vertical tube with a small bottle on
the outlet of the core at the highest point should work.
It would allow expansion and any air should find its way up and out.
Doesn't work. The only thing I have done that even comes close to
working is to have a small diameter bypass around the core that runs
through a bottle.
Even then, it takes a long time to get a fairly solid fluid flow.
Am I missing something?
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