Could have air pockets in the cooling system. The coolant sensor on the intake needs liquid coolant to tell the computer to turn the fan relay on.
Replace ect and burp air out of system
It's most likely the thermal relay. Remove the air cleaner completely including the lower portion. It's on the driver's side in front of the radiator support. I believe on a '97 the wires are green and black. It's held in with two small (1/4 I think) nuts. It takes a little patience to get it out but it's relatively easy.
The relay controls the fans and if it's bad it could have caused the initial cooling problem.
SOURCE: fan relay
I had this problem with my 98. There is a relay mounted on the wheel well below the battery. There is also a relay in the ecm. The engine computer. Hope this helps.
SOURCE: 1997 plymouth voyager radiator fans
I don't believe your particular vehicle's cooling system needs to be bled during coolant filling, but check the coolant level first. It seems that the coolant level is too low for the sensors to be able to sense the temperature, or the sensors are disconnected. Look for a connector on the intake manifold, near the coolant outlet. Ensure it is properly connected.
SOURCE: 96 plymouth grand voyager, transmission slipping,not shifting
trans is shot very common problem you can rebuid it but thats not cheap finding a used one will be very difficult as 96 is a one year only model and there where 2 within that year depending on the buid date of the van
SOURCE: my 1999 plymouth voyager van's radiator fan constantly on
There is a fan relay in the fuse box in the engine compartment. Usually that is the reason why it won't turn off. It fuses in the on position. If you have the manual it will say which one is the fan relay. just pull it out and get a new one. They are not expensive.
Hope this helps
SOURCE: Both radiator cooling fans won't turn on vehicle overheats
The fans come on only when hot or the AC is on. There are many fuses that have to be good for it to work. The fan relay should have 2 pins hot with the key on, The other 2 should be ground. with the key off one should be hot and the other can then be ground the other pins that are ground one of them is the fan. the other becomes ground when the computer turns the fans on. If you don't have a pin thats hot at the relay all the time then theres a blown fuse or even the power wire from the battery at the battery
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