Glad the op got his solved. I decided I didn't want to make the 75 mile trip for parts so I popped in a couple of hose barbs. No luck. Took the hoses loose at the core and ran water through from the garden hose. Wondered what the ac was running? Unplugged the compressor.

All I can figure is the air lock. Parked it with the rear ab out 2 feet lower than the front. Still no heat. It is approaching time for the anfo cure.

 

Getting some heat now. Wonder if the core is partially plugged. Plan on flushing first chance I get.

Of course now the 2 1/2 year old battery decided to die. Free 2 year replacement. Just my luck.