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I have a 92 plymouth voyager. The cooling fans won't turn on. I,ve checked
the fans they both work directly connected to the battery. I've unplugeed
the sensor (near the thermostat) and they still did not kick on. Does this
mean the relay is shot? any input would help alot . I,m pulling what little
hair I have left.
fishn4dabig1
simply unplugging the sensor most likely would not engage the relay. If it
works similar to most systems then the sensor's resistance will decrease
with the temp of the engine until it reaches near 0-ohms. which will ground
the relay completing the circuit and engage the fan(s).
Ok in simple terms. if the sensor is a one wire sensor, when you unplug it
connect the wire to a good ground, then listen for the relay to click. If
it does then the sensor is bad, if not then the relay is most likely to
blame. Due to the low cost of each and troubleshooting it is giving you a
headache, just replace both.
If you do want to continue with the troubleshooting let me know and I can
walk you through a few checks.
Here are a few more things to check:
the relay should have a constance 12V on on of the terminals, if not it
may just be a fuse
is the coolant level correct, if not the sensor may not be in the water
and will not read correctly
one of the fans is sometimes connected to the A/C switch, does one of the
fans come on with the A/C?
corbett_auto
The sensor is a 2 wire plug and I,m not even sure it,s the right sensor,
but its
the only one that seems to attach to the thermostat housing. and I don't
know which relay it is ther is 4 on the drivers side fender and 2 on the
passangers side. does anybody know where to get the prints for this,
without having to buy a chiltons.but I definetly will take your advise and
just replace all the probabilities of cause. Thankyou for your help.
fishn4dabig1
I forgot to mention that the fans do not work when A/C turned on. and even
stranger is that the dash guage reads normal operating temp, while the van
is overheating. Ive been reading around to find out which relay I need to
check but there seems to be some kind of confusion on the amount of relays
on the driver side fender. I only have 4 relays some people seem to have
5.?
fishn4dabig1
Have you recently had to add a large quantity of coolant to the system?
I suspect the problem may be a vapor lock condition.This happens when the
coolant level drops and more coolant is added and the engine is not vented
and air is trapped in the top of the engine. The sensors will not read
correctly if they are not submerged in coolant.
If this is the problem the cure is very simple. Try to find a sensor on the
top of the engine (but not located in the thermostat housing). Remove it
and add coolant until the level reaches the threads, then reinstall the
sensor and finish filling the radiator. If you can not find a sensor (or
plug) to remove you can always just remove the thermostat housing and
follow the same steps.... and while you are at it go ahead and replace the
thermostat (remember to bu a new gasket).
corbett_auto
just by chance if this is not the problem, can I tie into the ignition
directly and have the fans on as soon as I turn the car on. (just as a temp
fix until I get my new car) and if I can do this should I tie a inline fuse
in?
fishn4dabig1
That would be fine to tie in with the ignition switch, and yes use a fuse.
20amps should be a good size. Just be sure to tie into a wire that is only
hot with the key on....
Also, most parts places have a thermostatic switch you can mount under the
hood to control the fans.
corbett_auto
Thank you very much for your help, I really appreciated all of your input.
Also nice pictures. Dave...
fishn4dabig1
Use this site, with access number 123456789.
http://arrc.epnet.com.oh0049.oplin.org/autoasp/framerq.asp
Just in case you have problems:
The power to the radiator fan is via a fuseable link from the battery. The
interposing relay is controlled by the powertrain control module.
The wire from the fusable link to the relay is grey. From the relay to the
plug, it is light green. From the plug to the fan it is light green, or
black, or black & white.
The +12V to the relay coil is dark blue. The other side of the coil is dark
blue with pink trace, finally connected to pin 31 of the powertrain module
(cooling fan relay).
Wally
Thanks for the specifics Wally. He should be able to trace down the problem
with this info.
BTW: after you enter in the access ID the link does not take you to the
info. Is there a specific branch to search? Just in case he needs more
info...
corbett_auto
I found it it in the third Uni dropdown choice
Wally
Totally awsome information!!! I needed something like that. Thanks
Wally!!:thumbs:
dvdrose18
