Nissan Altima: radiator fans not working

It sounds like you either need a quick course in basic
electricity/electronics or a friend who has some background in
electricity.

It should be a simple circuit tracing exercise if you have a circuit
diagram.

Without a wiring diagram, it's more difficult and some of us have a hard
time tracing out what is going on without that crutch.

Lacking that you'll have to bite the bullet and have a shop work on it.
Your own time is probably worth something isn't it??? How much time do
you want to spend trying to figure it out when you might be doing
something else that is productive and which you have the experience and
background to do?



sunny wrote:
 

sunny wrote: 
I didn't want to make any assumptions here. Are you sure the motor is
warm enough for the fan to run? I believe for that year, the fan only
runs when the motor needs additional cooling. Of course, if you need
air conditioning, then it's probably warm enough for the fan(s) to run.
What does the temp gauge say?

On Tue, 27 Apr 2004 10:13:00 -0700, sunny wrote:
 

---snip---
 

Does the A/C blow cold air at steady speeds above 35 mph? If so, then
your fans have a problem. If not, your A/C system is probably low on
refrigerant, and neither the compressor nor the fans will run.

com wrote in message news:<6AAjc.28699$columbus.rr.com>... 

According to Chilton's they say both fans must rotate at a low speed
when the ac is switched on. This isnt happening

"James M. Blaschak" <localdomain> wrote in message news:<localdomain>... 


The AC is not blowing any cold air at any speed. I guess I will check
the fans after the car is warm.

On 4/28/04 2:28 PM, in article
google.com, "sunny"
<com> wrote:
 


It is unlikely that both fans are bad. If they don't come on when you
switch on the AC, then the problem is in the switching. Either they are not
getting power, or the switch is bad. First thing to check is fuses and
breakers, then connections and grounds.

I think it will be easier to solve the problem of the fans not coming on
with the AC before looking into whether they work when the engine is warm.
Switching on the AC should make the fans come on regardless of engine temp.

"E. Meyer" <org> wrote in message news:<BCB67CAD.6D0CA%org>... 

Thanks. I think it is likely a connection problem. I guess I will
trace it. I am only hoping that the ac not blowing cold air is a
symptom of the fans not coming on and not a problem with the ac
itself. Thank to all who responded.

com (sunny) wrote in message news:<google.com>... 

The compressor doesnt seem to be engaging. I see no voltage being
delivered to the fans. I followed the diagnostic procedure in Chiltons
manual -

1. Start engine, turn on ac. Both fans must rotate at low speed -
FAILED, go to next step
2. Stop engine, disconnect fan relay-1 and jumper relay terminals 3
and 5. Disconnect both fan motor harness connectors, Turn ignition
switch on. Check voltage between terminal a and ground. Must get
Battery voltage - FAILED, go to next step
3. Check "GY" fusible link - I assume this is the fusible link
attached to the positive battery. Tested ok
Check "R" fusible link - I assume this is the 45 amps (red) fusible
link in the fusible link box. Tested ok
Check Joint Connector (J/C) E51 - I dont know how to locate this or
what it looks like. Anyone know ?
If step 3 were ok, then it says to repair the harness or connectors. I
dont know which connectors they mean.

I also checked the fuses in the car (dash compartment) are ok.

From the wiring diagram, it looked like the Battery voltage is
directly fed to the fan harness via the above fusible links, J/C,
relay. Is the ECU involved in any way to get voltage to the fan. I am
assuming the ECU is only involved in the control aspect. The voltage
part is just a feed from the battery. If so, could it just be a wire
continuity problem ? Kinda unlikely for wires to both fans to go bad.