my heater in my 94 ford ranger went out about a month ago today i flushed the heater core and it worked for a while and started going out again after i was driving for 15 to 20 mins. the hose going into the heater core was warm but coming out wasnt. could it have gotten clogged again or could it be something else.
You need to find the Heater Core water valve.. That's the part that works as the TEMP. Control.. Water Pumps don't die slowly..and leak tremendously.. === Sometimes the Water Control valve(seizes).. So..you need somebody to throw the TEMP Lever back and forth..until you can find the valve location.. You may see the cable moving--put not acting upon the valve.. Usually the valve is shot--spraying a lubricant at it won't do anything.. It needs to be removed--too be worked upon.. Also check all the heater hoses for wear--damage--you may need to rebuild that part of the system.
your right on the problem so to really figure it out take the hose off or lose enough to make a mess and see it flowing. Take it off at the water pump thats where it comes out at. the water pump pumps water into the radiator or up, not the other way around.
