Question about 1991 Ford F250
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Posted on Jan 02, 2017
You just might have an air lock. Try bleeding the system from the heater hose at the firewall. Losen one hose a little, and at operating temp. open slightly to let air out. You will lose some coolant, but just refill the rad. Now, both hoses should get hot.
Posted on Jan 01, 2010
If your blend door actuator (HOT - COLD) control works, you probably have a clog in the heater core. Both hoses should be almost at the same temperature, it only takes coolant a few seconds to go thru the Heater core. Remove the outlet hose of the Heater core at the engine intake, plug intake using a piece of hose squeeze shut, route the hose downward into a container placed under vehicle to collect engine coolant, turn heater all the way up and start engine for a couple of seconds. This may unplug the heater core or at least will let you know if it is clogged. If you need to do this more than twice to clear heater core, make sure the coolant is refilled.
Good Luck! Keep me posted!
Posted on Dec 13, 2010
if the heater hoses are hot the only thing it could be is a blend door, if you can hear the door moving its not closing all the way, those are made of plastic and are common to brake at the actuator you will hear the actuator work but it will only partially close and open the door
Posted on Dec 20, 2010
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