A/C and radiator fans not spinning.

im having problems with my 92 honda civic DX A/C and radiator fans. both
are not working. but when i tried to connect it directly to the battery ,
it turns. i just noticed it because my A/C now is blowing warm to hot air
even though my A/C is on. so i tried to look at the fans and i noticed it
not turning even though i turn on my A/C. Pls. if anybody could give me
some answers to this, itll be much appreciated. 1 more thing, i checked
and replaced my relays already but still it didnt do anything at all.
thank you very much for your response. yours truly, igoodtoo

 

Check tegger.com on his heating/cooling section.

There are two fuses for both motors and one common fuse on newer civics that
drives one side of both relay coils -- check to make sure your car has this
common fuse. On my schematic, it is labled "13". The radiator and condensor
fuses are labled "33" and 35" on my schematic, respectively. I don't have a
92 schematic, so do check the designations.

Find the contact side of both relays and short them, one at a time. If the
fans do not come on, check if one side of that contact is 12V. The other
should go to the fan and the other side of the fan should go to ground. The
schematic does not show these grounds to be the same physical connection,
but you may want to make sure that this is true.
I suspect your fans will come on independently with these contacts shorted
because that circuitry does not have anything in common.

If they do come on, whatever drives the relays is missing - the relays share
a common drive signal in that both fans are supposed to come on with the AC
running. or overheating and the regular cooling fan is supposed to come on
if the thermoswitch closes -- that's probably not where your problem is
because those subsystems are almost independent.

Both relay contacts do share a common 12V. So check to make sure that you
have 12V on one side of each coil - that may be driven by that common fuse
mentioned above. It seems to drive a bunch of other things too (recirc
control, AC compressor clutch, blower motor, etc). If that common fuse is
good (probably is good), trace the wiring back to your relay - it must be
broken.

I'll be out over the next couple of days and can't respond - I am sure
others here can help you if you get stuck.
Hope you find it soon.

Remco