I used to install AC in those, so I might be able to help. It is either the temp adjustment linkage, or it is the accessory selector. When you go from AC to heater does the air move from the vents to blowing on the floor? If so then it is possible that the linkage to the temp controller has probably slipped off one of the levers that controls the incoming air, from cold to hot. It is an easy fix. It would have to be that, because if you couldn't switch from AC to heat, you can always make the AC hot with the temp control lever.
SOURCE: 1999 plymouth grand voyager overheats when the ac is on
when the ac is on the computer is looking at pressure in the ac system to control the cooling fan operation if the pressure is increasing the cooling fan is commanded on now if the pressure switch is bad or if the ac system is low on refrigerant it is not building pressure and the cooling fans are not going to come on.
SOURCE: 1996 plymouth voyager van blower --high only
YOUR BLOWER MOTOR RESISTOR IS BAD OR THE BLOWER MOTOR CONTROL SWITCH COULD BE FAULTY.
SOURCE: '99 Plymouth Grand Voyager fan switch issues
The problem is not with the switch, it's the blower motor resistor. The resistor is usually located in duct work near the blower motor. It will have 4or 5 wires going to it and is held in place with a couple screws. These things generate heat, so they put them in duct work so the fan blows air across them to keep them cool. Sometimes the plug gets hot and melts, you should be able to buy the resitor and the plug with wires (pig tail) from an auto parts store or a dealer. The resistors are usually about $50 the pig tail is about $30.
SOURCE: heater blows cold air 1995 plymouth voyager
With the engine cold & the radiator full remove the radiator cap and start the engine. Let the engine reach operating temperature which will open the thermostat. When it opens the water in the radiator will start circulating if the pump & thermostat are operating properly. If all is ok replace the cap and turn the temperature lever on the heater to hot If you still have no heat check the heater valve on the engine firewall. Open it manually and see if you have heat. If yes check the cable from the velve to the temperature lever.
SOURCE: The heater in my 1995 PLymouth voyager mini van is
with the engine warmed up + the heater on fan off check the heater control valve make sure it's not
physicaly damaged then have somone turn the heat
on+off if it is vacum controled pull vac line make sure you have vacum+it starts and stops if it is mechanical you can see if it works or not still the
best test is to pull the valve + blow through it if it's
vacum leave the line on to open and close it
if the valve works it is most likely a pluged heater
core. if you're gonna DIY stop by the library and
check out a chilton/moter/mitchells or haynes
repair manual or you can go to any auto parts store
and buy the haynes repair manual specific to your
car for about $10.00 any of these books will give
you the step by steps and diagrams you need to
do the job. hope this helps any other ? gimme a
shout good luck
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