I had almost the same problem. All air came out defrost and heat vents. Found that vacuum line under hood was not connected to the intake hose near the mass air flow sensor. Also a line that "T"ed off the line mentioned above was broken. A very simple fix.
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if all your air or heat comes out of your defrost than the problem is more than likely your switch or a vacuum hose to the switch. Car's default to defrost when there is a problem. I can't recall off the top of my head but I do believe that vacuum controls the blend doors on the 98 Ranger. I can't quite remember but I think the white one is the main vacuum. Either way. pull out your heater switches, disconnect the rubbery plug with all the vacuum hoses, start the engine....1 of those should have constant vacuum, if not...chase it.....there will be 1 that goes through the firewall to the engine, the rest go to the blend doors.
The vacuum motor is located under the dash in a most inaccesable location. Will be located above the air ducts about center dash. Follow the heater control vacuum hoses to the motor unit. Remember that it is connected by linkage to an air duct.
The first thing is to check the vacuum lines in the engine bay and coming off the HVAC. Your system is vacuum controlled. It sounds like a hose either rotted and split or you might get away with one having come off.
Check the hoses real well in the engine bay running to the HVAC. Which will be the blower motor area.
Do you hear the actuator moving when you switch the temp/heat to AC?
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WARNING Windshield washer solution contains methanol which is poisonous. Observe all cautions and warnings indicated on label of washer solution container. NOTE: Windshield washer fluid should be collected in a container after the windshield washer hose is disconnected. To Install: WARNING Windshield washer solution contains methanol which is poisonous. Observe all cautions and warnings indicated on label of washer solution container.
Install washer pump in reservoir.
Install washer pump reservoir assembly.
Connect washer hose.
Connect washer electrical connector.
Install air cleaner assembly.
The windshield wiper fluid pump is located in the tank which is not in the heater motor or defroster area in the dash.
The defroster/heat control door is located in the dash board area:
I had this problem and noticed a faint clunking sound behind the radio. It was the blend door motor that needed to be replaced. The motor has small fine tooth plastic gears that wear out and won't open to allow heat.
There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.
Car manufacturers use the defrost mode as a default for safety reasons. Being they want you to be able to defrost the windshield no matter what. So when something goes wrong the system automatically goes to the defrost mode. You most likely don't have the vacuum hose connected under the dash at the climate control assy. Or if this vehicle doesn't use the vacuum hose style you may have not plugged in one of the connectors under the dash or behind the climate control assy. Good luck.
a kink in the hose will cause poor water flow so it will be slow to heat and may cause the heat not to be as hot, as for the defrost, check the operation of all diverter doors, should be vacuum controlled, you may have a vacuum leak under dash or missing hose
The switch that does this is the mode control, You will need to pull the heater control out and check that it is sending a vacuum signal to the defrost air diversion door vacuum motor, if it is then the hose is either restricted or the vacuum motor is bad or more likely something has fallen down into the dash and jammed the defrost door, this is the most common problem I saw as a Ford dealer tech for 20 years. The usual item found is a pen or pencil.