94 town and coutry, cooling fan wires

OK, so I'm trying to fix this overheating issue I have on my town and
country van. I may have to replace the cooling fan. Strange thing, the
cooling fan has four wires conected to the motor instead of two. Does
anyone know why there's more than two wires and what they all do?

TIA

Paul

 

The extra two wires are to prevent people like you from using a fan
you bought 10 years ago for a different car and have sitting on a shelf. ;-)

Seriously, it's probably for a sensor that tells the car computer how
fast the fan is turning.

Ted

 

Its a 2 speed radiator fan motor with a high and low speed relay

 

Hi Paul,
I've been through this with my '94 Grand Caravan and know all about it.
Max is right about the 2 speeds. The four wires are: low speed ground,
high speed ground, Low speed 12 volts and high speed 12 volts. A single
speed motor won't move enough air so forget that option. The way the 4
wire motor works is that there are 4 brushes on the commutator of the
motor. When the cooling demand is low, the computer will enngage the low
fan relay only. The low speed ground of the fan is permanetly connected to
the negative, chassis ground of the van and the fan will then run at low
speed. When you switch on the A/C or the engine needs more cooling the 2
High fan relays engage connecting the high speed ground wire to ground and
the high speed 12 volt wire to 12 volts. At this point all 4 wires/brushes
are in use and the fan runs at high speed. When the brushes of the motor
wear down, which is common, the motor starts shorting out as the springs
and brush wires fry the commutator. Low and or Hi fan fuses will blow in
the fuse/relay center under the hood. I priced the fan at the dealer- 350
Bucks!! In my opinion, robbery!. Also you can't get just the motor from
the dealer, just the whole assembly. I didn't bother with the junkyard
route, as what they have will have some, if not alot, of wear on the
brushes. I tried a single speed motor, which didn't move enough air even
though the manufacturer claimed it moves enough air to sub for an engine
mounted fan on a Chevy 350 V8. I ended up at autozone and spent $65 for an
aftermarket 4 wire motor which is manufactured by Siemens for these
vehicles. It is fantastic and appears to be better built than the original
from Chrysler. That was 3 years ago with never a problem since. Hope it
helps you out, Mike
P.S. The motor will bolt right into your factory shroud and please note,
the threads on the nut which attaches the fan blade are left hand.

 

Well done....are you looking for a job?