My 97' Ford Ranger does not blow cold air. All other parts of the system works, When I turn the knob to A/C it only blows the outside temp. air. Please help me.... (Other details are... The heat works great and it blows on all modes and through all the vents that I choose.)
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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.
Cold air like, really cold or just cool. Sounds like your hot/cold blend door motor has perhaps failed with the blend door in the semi hot position. Blend door motor failure is very common on the Ford truck HVAC systems. Is is located behind the glovebox on top of the HVAC housing assembly.
The most common cause of this in the Ranger and the Explorer is that a part called the air temeperature control blend door acuator or the blend door shaft that the electric actuator moves has broken, this door is what shuttles between the heater core and the AC core and provides either heated or cooled air, or a blend of the two hot and cold air streams.
Not an expert by any means, but i know my ranger.. I had a small leak at the top of my radiator that still cooled the engine but didnt have enough pressure to get to the heater. The heater hoses travel up over the engine and just were not gettin anything to my heater core. That or make sure the heater control valve is operating.
It sounds like you have air trapped in the cooling system. Try filling the radiator and coolant reservoir cold. Then leave the radiator cap loose and run engine at 1500 rpm until it warms up and the thermostat opens. Make sure heater is on full warm setting.