If you can't change the vent arrangement (I'm reading that you are stuck in defrost), then it is likely a problem in your blender doors.
However, some grands (not all) have rear heater cores, so it is possible your front core is bad but your rear isn't. If that is the case you can try disconnecting the hoses to the your front heater core and hooking up a hose for a good flush.
I would not bother trying that if you can't adjust the vent arrangement though. In that case, your going to need to take your dash off and troubleshoot the vent chamber, which is a pain btw.
I had same problem...my heater control valve was plugged. but I was told it could be anyone of following things or it could be blender doors. or low coolant level or bubbles in line. hopefully this helps you.
on my 98 heater hoses are at the firewall to the right as you go under the hood. voyager have a tendency to clog up heater cores
The Plymouth Grand Voyager.
.the heater core is behind the dash .
lacing windshield fluid reseroir on 198 plymouth grand voyager
It doesn't, a 1996 Plymouth Voyager does not have a cabin filter.
The 1987 Plymouth Voyager weighs in at about 3,305 pounds. The 1987 Plymouth Grand Voyager weighs right around 3,531 pounds.
what do I need to change the 1997 Plymouth voyager transmission oil
yes of course you can people
were is the cooling temperature sensor located on my 96 Plymouth grand voyager
The Gran Voyager has more bells and whistles added to the vehicle as to a Voyager and with the year difference, advanced technology.
Transmission control module.
I'm looking for the same answer but mine is for a Plymouth Grand Voyager.... I'm looking for the same answer but mine is for a Plymouth Grand Voyager.... I'm looking for the same answer but mine is for a Plymouth Grand Voyager....
Why does the engine slow down when you press the accelerator on a 90 Plymouth grand voyager LE 3.3L?
Go to Rockauto. com and look up the part # on them. You do have the same size motor in both vehicles?
where is crankshaft sensor located on 1999 plymouth grand voyager 3.0 litre
it is the completion of the codes
The fuse box diagram for a 1996 Plymouth Grand Voyager is on the inside fuse box cover. It is also found in the owners manual of the car.
If the cooling fan on a 1998 Plymouth Grand Voyager won't come it, the fuse could be blown. The fan can also be froze up.