I'm not 100% certain, but the heater control valve on our ranch wagon seems to be dripping coolant from the underside of the valve body. I thought it was from the new heater hose I put on, so I double clamped it, but I still get a drip than makes it's way down to the top of the intake. The car still has the stock heater with the vacuum line going through the firewall to the heater core (I think). So if I just replace the control valve with a 90 degree 5/8" - 1/2"NPT fitting will the heater still operate without the vacuum line?
Rono

  Ron Lane,  Meridian, ID