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Are the heater core hoses hot? If so then you will need to replace the air temperature control blend door and its electric actuator. If this is the problem you can speed the repair time (10 hours) by using a kit called a Heaterbeater. You can buy the kits on eBay.
check the cooling system to make sure the system is full.next check the temperature of the heater hoses when the car is at operating temperature.they should be the same temp,if one is not as hot as the other then the heater core is plugged and will need to be replaced.you can try to run clr through the heater core to see if it will unplug the heater.the other thing is the temp door will have to be checked to make sure its moving through out its full travel by moving the temp knob/lever and looking at the door arm to see it travel full range.this is located under the dash on the passenger side on the duct work.
FLUSH RADIATOR, HEATER CORE AND ENGINE BLOCK.ADD 50 / 50 ANTIFREEZE AND WATER ALSO REPLACE RADIATOR PRESSURE CAP.IF TEMPERATURE GAUGE STILL STAY HIGH THE ENGINE COOLANT TEMPERATURE SENSOR COULD BE FAULTY.
Check if the blend door is working, do you hear any operation or change when temperature setting is changed? If not, possible blend door problem. Or do it is that you have heat at the floor and not on your face, it could be a mode door problem. If neitherr, then check thermostat? Hold hoses to and from, should be firm. Heater core itself can be plugged on these models. You can check the temperature of the inlet and outlet hoses at the firewall with an infared temperature gun. They should be equal. If drastic difference, core is plugged. Backflush the heater core if this is the issue. If improves and returns, new heater core will be required.
check if both heater hoses going into firewall are hot.. if only one is hot then your heater core is stopped up..you can take both lines loose and take a water hose and back flush,,, force hose on one inlet of heater core for a minute and then the other.. keep going to you get a good flow...make sure heater valve is open, not just valve position take loose and confirm clear..last make sure your thermostat is not stuck open keeping engine from comming up to temperature
From Haynes Repair Manual #36071, Ford Ranger Pickups 1993 - 2005: (1)Disarm the airbag system; (2)allow the cooling system to completely cool down; (3)using a thick cloth for protection, turn the radiator filler cap to the first stop; (4)step back and let the pressure release; (5)once the pressure has been released, completely drain the cooling system; (6) working within the engine compartment, loosen the ****,ps on the heater hoses at the engine compartment side of the firewall, twist the hoses and carefully sepseparate them from the heater core tubes; (7)plug or cap the heater core tubes to prevent coolant from spilling into the passenger compartment when the heater core is removed; (8)place a plastic sheet on the floor of the vehicle to prevent stains if the coolant spills; (9)remove the instrument panel; (10)remove the PCM heat sink and ground strap; (11)remove the heater plenum chamber; (12)separate the heater core from the heater plenum chamber; (13)installation is the reverse of the removal with the following additions; (a)fill the cooling system; (b)run the engine, check for leaks and test the heater.