Coyote Heater Coolant Supply & Return?

[tcollins]

Does anyone know if that 5/16 dia. heater circuit flow connector that is specified in Coyote coolant system diagram is only for filling and purging?

Background: I plumbed my heater circuit per the instructions, but couldn’t get the heater to work until I plugged the “H” connector. The Vintage Air heater control valve I have is either open or closed when the car is on and the heater is off. So per the Coyote instructions, you need the heater supply and return ports to be connected to purge air from the RH head. So I designed this aluminum block with the 5/16 cross hole but when it was opened, no coolant was getting to the heater. The system was filled and vacuum purged, so it wasn’t an air trap.

Should I buy this upgraded Thermotion heater control valve that FFR seems to now be using?

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[CVOBill]

Tim,

I have the H-pipe in my heater hoses and the heater works great, I don't see a reason for you to buy the valve.

[1932]

However you do the heater there has to be water movement in both heads with heater off.

[nkw8181]

I had ther wrong thermostat trinary switch. Check it and check with factory five. Mine works with the correct one. I went through everything several times before we determined that to be the problem.

[nkw8181]

I believe it can be seen by the wire colors