Vehicle make/model = Olds Aurora
Year = 1996
Mileage = 264000 kms
Engine size = 4.0
dash lights = no
codes = no
work done prior = Numerous electrical issues, engine harness at
firewall (replaced entire harness, corrected most other issues)
work done to repair = Checked fuses, No 2 and no 3 cooling fan relays.
With ohm meter checked control circuit wire for these 2 relays back
to the pcm. Checked engine operating temp according to pcm via obd
scan port, above perceived fan cut in. Appears pcm is not signaling
relays. According to wiring diagrams pcm should ground the control circuit
in relay at cut-in and is not doing so. Wire back to pcm is intact
according to ohm meter. Can not locate #1 cooling fan relay (other 2 under
hood at rt frt)to perform same checks on it.
tech = KK
question = Cooling fans will not run with or without a/c on and well
above cut in temp. I would like to perform the same checks I did on the #
2 & 3 relays on the #1 relay but have been unable to locate it. Where
is the #1 (low speed) cooling fan located? Any other conditions that
will prevent the pcm from signalling the fan relays? It would seem
that it is the pcm, but I would like to be certain.
Thanks for any help you might provide.
KK:
The #1 (low speed) fan relay is on the rear of the engine compartment, left of the wiper motor.
Make sure all fuses are good. There are 2 fuses in this system. This system can get a little
complicated the way that all relays work with/through each other. Let me know if you need more
help, KK
Back
Year = 1996
Mileage = 264000 kms
Engine size = 4.0
dash lights = no
codes = no
work done prior = Numerous electrical issues, engine harness at
firewall (replaced entire harness, corrected most other issues)
work done to repair = Checked fuses, No 2 and no 3 cooling fan relays.
With ohm meter checked control circuit wire for these 2 relays back
to the pcm. Checked engine operating temp according to pcm via obd
scan port, above perceived fan cut in. Appears pcm is not signaling
relays. According to wiring diagrams pcm should ground the control circuit
in relay at cut-in and is not doing so. Wire back to pcm is intact
according to ohm meter. Can not locate #1 cooling fan relay (other 2 under
hood at rt frt)to perform same checks on it.
tech = KK
question = Cooling fans will not run with or without a/c on and well
above cut in temp. I would like to perform the same checks I did on the #
2 & 3 relays on the #1 relay but have been unable to locate it. Where
is the #1 (low speed) cooling fan located? Any other conditions that
will prevent the pcm from signalling the fan relays? It would seem
that it is the pcm, but I would like to be certain.
Thanks for any help you might provide.
KK:
The #1 (low speed) fan relay is on the rear of the engine compartment, left of the wiper motor.
Make sure all fuses are good. There are 2 fuses in this system. This system can get a little
complicated the way that all relays work with/through each other. Let me know if you need more
help, KK
Back
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