[Canuk40]

Hi Cliff,

Also check the vacumm to the hot water valve dashpot. I've seen them reversed or leaking, either way, no heat. You could also have an airlock in the heater. You can see the valve in the pic below.

Although not in this pic, we fit radiator back flush fittings in the hose entering the heater and fill the car from there. The heaters' vacumm valve has to be propped open while filling the car. FYI

Cheers