Alright now for the troubleshooting party.
On bypass mode, cabin heater works well, but ONLY after accelerating & holding engine above 1700 RPM
otherwise, spent 20 minutes at 190 degree idle temp and rpm & no change in cabin heat.
I have not yet plumbed in the water pump to the "exchange side" of heat exchange, so unsure if this is a side effect or fault of that check valve-
When in shower mode, cabin will NOT warm up when heater is on. No exception here- only cold air blows out on full heat.
Took a very long time for heat exchange to get hot to the touch- my other concern is where the air bubble is-
Heat exchange was empty upon install & I filled the coolant reservoir before starting engine, leaving only a tiny bubble in reservoir empty- this bubble had not grown, meaning the reservoir has not refilled the void in this system that needs to be filled.
How do I flush the air out?
I did prime my hoses/exchanger with coolant before running engine.
I need to idle around 1050+ rpm for the exchanger to get really hot.