1st gen 3.5 LHS (1996) cooling

Did that come from an Alldata account? If so, it should also give you
access to the schematic right out of the FSM.

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')



rob wrote:
> found this today....
>
> DESCRIPTION
> All models use electric motor driven fans. The fan modules include a motor
> support and shroud. The module is fastened to the radiator by screws with
> U-nuts and retaining clips.
>
> OPERATION
> The dual fan module is a combination of 2 fans mounted in a one piece shroud
> which operate at two speeds and are simultaneously activated. The dual fan
> system improves engine cooling and air conditioning performance in hot
> weather and severe driving conditions, while reducing fan noise and power
> consumption.
>
> CAUTION: Attempts to reduce high temperature gauge reading by increasing
> engine speed, at the same vehicle speed, can increase high temperature.
>
> CIRCUIT OPERATION
> The radiator fan system uses two relays located in the Power Distribution
> Center (PDC) . One relay is used for LOW speed fan operation and the other
> is for HIGH speed operation. The Powertrain Control Module (PCM) controls
> the operation of the relays depending on engine coolant temperature and/or
> A/C operation.
>
> Power for the coil side of both relays is provided on circuit F18. This
> circuit is protected by a 10 amp fuse located in cavity 20 of the junction
> block. Power for the contact side of the relays is provided on circuit A16.
> This circuit is protected by a 40 amp fuse located in cavity D of the PDC.
>
> When LOW speed fan operation is required, the PCM grounds circuit C24. This
> causes the contacts in the relay to CLOSE connecting circuits A16 and C23.
> Circuit C23 connects from the relay, and is spliced to the low speed fan
> motor and the Radio Frequency Interference (RFI) suppression module. Ground
> for the motor is provided on circuit Z1, which terminates at the left front
> frame rail.
>
> When HIGH speed fan operation is required the PCM grounds circuit C27. This
> causes the contacts in the relay to CLOSE connecting circuits A16 and C25.
> Circuit C25 connects from the relay, and is spliced to the high speed fan
> motor and the RFI suppression module. Ground for the motor is provided on
> circuit Z1, which terminates at the left front frame rail.
>
> Copyright © 2008 ALLDATA LLC
>
> "rob" > wrote in message
> g.com...
>> ditto
>>
>>
>> "Bill Putney" > wrote in message
>> ...
>>> Steve wrote:
>>>
>>>> ...The right-side motor is a screwball thing with two sets of winding.
>>>> On low speed, one of its windings is powered from the car, the other
>>>> acts as a generator and drives the left-side fan...
>>> Wow. That is screwball. You sure about that? I'd love to see the
>>> schematics for that. Anyway you could email that to me?
>>>
>>> Bill Putney
>>> (To reply by e-mail, replace the last letter of the alphabet in my
>>> address with the letter 'x')
>>
>
>

update. new fans working much better. new ones from local dealer were
700.00 bucks! i went parts jobber and got them for 254. now the only issue
is a short in the high side. jumping it only turns on the low side fan so
i'll need to do some wire searching tomorrow night.


"rob" > wrote in message
ng.com...
> found this today....
>
> DESCRIPTION
> All models use electric motor driven fans. The fan modules include a motor
> support and shroud. The module is fastened to the radiator by screws with
> U-nuts and retaining clips.
>
> OPERATION
> The dual fan module is a combination of 2 fans mounted in a one piece
> shroud which operate at two speeds and are simultaneously activated. The
> dual fan system improves engine cooling and air conditioning performance
> in hot weather and severe driving conditions, while reducing fan noise and
> power consumption.
>
> CAUTION: Attempts to reduce high temperature gauge reading by increasing
> engine speed, at the same vehicle speed, can increase high temperature.
>
> CIRCUIT OPERATION
> The radiator fan system uses two relays located in the Power Distribution
> Center (PDC) . One relay is used for LOW speed fan operation and the other
> is for HIGH speed operation. The Powertrain Control Module (PCM) controls
> the operation of the relays depending on engine coolant temperature and/or
> A/C operation.
>
> Power for the coil side of both relays is provided on circuit F18. This
> circuit is protected by a 10 amp fuse located in cavity 20 of the junction
> block. Power for the contact side of the relays is provided on circuit
> A16. This circuit is protected by a 40 amp fuse located in cavity D of the
> PDC.
>
> When LOW speed fan operation is required, the PCM grounds circuit C24.
> This causes the contacts in the relay to CLOSE connecting circuits A16 and
> C23. Circuit C23 connects from the relay, and is spliced to the low speed
> fan motor and the Radio Frequency Interference (RFI) suppression module.
> Ground for the motor is provided on circuit Z1, which terminates at the
> left front frame rail.
>
> When HIGH speed fan operation is required the PCM grounds circuit C27.
> This causes the contacts in the relay to CLOSE connecting circuits A16 and
> C25. Circuit C25 connects from the relay, and is spliced to the high speed
> fan motor and the RFI suppression module. Ground for the motor is provided
> on circuit Z1, which terminates at the left front frame rail.
>
> Copyright © 2008 ALLDATA LLC
>
> "rob" > wrote in message
> g.com...
>> ditto
>>
>>
>> "Bill Putney" > wrote in message
>> ...
>>> Steve wrote:
>>>
>>>> ...The right-side motor is a screwball thing with two sets of winding.
>>>> On low speed, one of its windings is powered from the car, the other
>>>> acts as a generator and drives the left-side fan...
>>>
>>> Wow. That is screwball. You sure about that? I'd love to see the
>>> schematics for that. Anyway you could email that to me?
>>>
>>> Bill Putney
>>> (To reply by e-mail, replace the last letter of the alphabet in my
>>> address with the letter 'x')
>>
>>
>
>

yeah there's an updated TSB on the wiring diagram
NUMBER: 26-10-95A



i can email it to you if you want.....



also found Cooling Fan - Noise/Poor Idle Quality
NO: 18-20-96



"Bill Putney" > wrote in message
...
> Did that come from an Alldata account? If so, it should also give you
> access to the schematic right out of the FSM.
>
> Bill Putney
> (To reply by e-mail, replace the last letter of the alphabet in my address
> with the letter 'x')
>
>
>
> rob wrote:
>> found this today....
>>
>> DESCRIPTION
>> All models use electric motor driven fans. The fan modules include a
>> motor support and shroud. The module is fastened to the radiator by
>> screws with U-nuts and retaining clips.
>>
>> OPERATION
>> The dual fan module is a combination of 2 fans mounted in a one piece
>> shroud which operate at two speeds and are simultaneously activated. The
>> dual fan system improves engine cooling and air conditioning performance
>> in hot weather and severe driving conditions, while reducing fan noise
>> and power consumption.
>>
>> CAUTION: Attempts to reduce high temperature gauge reading by increasing
>> engine speed, at the same vehicle speed, can increase high temperature.
>>
>> CIRCUIT OPERATION
>> The radiator fan system uses two relays located in the Power Distribution
>> Center (PDC) . One relay is used for LOW speed fan operation and the
>> other is for HIGH speed operation. The Powertrain Control Module (PCM)
>> controls the operation of the relays depending on engine coolant
>> temperature and/or A/C operation.
>>
>> Power for the coil side of both relays is provided on circuit F18. This
>> circuit is protected by a 10 amp fuse located in cavity 20 of the
>> junction block. Power for the contact side of the relays is provided on
>> circuit A16. This circuit is protected by a 40 amp fuse located in cavity
>> D of the PDC.
>>
>> When LOW speed fan operation is required, the PCM grounds circuit C24.
>> This causes the contacts in the relay to CLOSE connecting circuits A16
>> and C23. Circuit C23 connects from the relay, and is spliced to the low
>> speed fan motor and the Radio Frequency Interference (RFI) suppression
>> module. Ground for the motor is provided on circuit Z1, which terminates
>> at the left front frame rail.
>>
>> When HIGH speed fan operation is required the PCM grounds circuit C27.
>> This causes the contacts in the relay to CLOSE connecting circuits A16
>> and C25. Circuit C25 connects from the relay, and is spliced to the high
>> speed fan motor and the RFI suppression module. Ground for the motor is
>> provided on circuit Z1, which terminates at the left front frame rail.
>>
>> Copyright © 2008 ALLDATA LLC
>>
>> "rob" > wrote in message
>> g.com...
>>> ditto
>>>
>>>
>>> "Bill Putney" > wrote in message
>>> ...
>>>> Steve wrote:
>>>>
>>>>> ...The right-side motor is a screwball thing with two sets of winding.
>>>>> On low speed, one of its windings is powered from the car, the other
>>>>> acts as a generator and drives the left-side fan...
>>>> Wow. That is screwball. You sure about that? I'd love to see the
>>>> schematics for that. Anyway you could email that to me?
>>>>
>>>> Bill Putney
>>>> (To reply by e-mail, replace the last letter of the alphabet in my
>>>> address with the letter 'x')
>>>
>>

I don't think its actually detailed in the FSM (Rob posted a very good
verbal description from alldata in a subsequent post). I figured out
what was going on with a DVM and some experimentation when my wife's car
suffered its first fan motor casualty a few years back.


Bill Putney wrote:
> Steve wrote:
>
>> ...The right-side motor is a screwball thing with two sets of winding.
>> On low speed, one of its windings is powered from the car, the other
>> acts as a generator and drives the left-side fan...
>
> Wow. That is screwball. You sure about that? I'd love to see the
> schematics for that. Anyway you could email that to me?
>
> Bill Putney
> (To reply by e-mail, replace the last letter of the alphabet in my
> address with the letter 'x')

rob wrote:
> update. new fans working much better. new ones from local dealer were
> 700.00 bucks! i went parts jobber and got them for 254.

Well, now I don't feel so bad about paying $280 (tax and shipping
included) for my new module. It does still cheese me off that I can't
still get a replacement passenger-side motor like I did the first time I
had problems years ago. Everywhere I went they had plenty of DRIVER side
motors- but in my experience they never fail. The original one on wife's
93 was still working fine.

254.00 for mine at CARQUEST. everyone else i called could get them in 3
days, but that does help me get back and forth to work.

WARNING! they and a lot of other parts dealers carry DORMAN? fans now and i
was told this is a new product for them. i got my new one and it worked for
about a day and half. the connections to the high side fan (drivers side)
was loose all the time and the passenger side fan was doing all the work,
but then it got to the point it got hot and stopped working. the parts guy
that originally sold it to me said they have an issue with their quality
from time to time (duhhhh) but its lifetime warranted. so out it came and
back for another. works fine now.

also the parts guy at my local Chrysler told me he could maybe get me a
right side motor if i needed one but there was only 7 or 8 left, and they
would be about a week or 2 coming, and no guarantees on that. also he said
they superseded it with the full unit (both fans and shroud) since they were
only selling about 5 right side motors a year and that was nationwide!



"Steve" > wrote in message
...
>I don't think its actually detailed in the FSM (Rob posted a very good
>verbal description from alldata in a subsequent post). I figured out what
>was going on with a DVM and some experimentation when my wife's car
>suffered its first fan motor casualty a few years back.
>
>
> Bill Putney wrote:
>> Steve wrote:
>>
>>> ...The right-side motor is a screwball thing with two sets of winding.
>>> On low speed, one of its windings is powered from the car, the other
>>> acts as a generator and drives the left-side fan...
>>
>> Wow. That is screwball. You sure about that? I'd love to see the
>> schematics for that. Anyway you could email that to me?
>>
>> Bill Putney
>> (To reply by e-mail, replace the last letter of the alphabet in my
>> address with the letter 'x')