Have the FFR old style heater. The hose to the heater from manifold is hot (with valve), but the hose exiting the heater is cold? IN other words, one hose hot other cold? Could they be backwards ? Does it matter which hose feeds the heater. The elbow closest to the firewall is the warm hose. Installed per FFR instructions. Thanks
Hoses hooked up, return to water pump and feed from top of manifold. I disconnected the lines from the heater and they are dry. So I will trace back to valve and see.
It does'nt really matter which hose conects to the inlet or outlet of the heater core.
But if one hose is hot but other not. Heater control valve is closed. Or heater core is blocked.
Another cause is coolant level is too low,or sstem still needs burping
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