Cooling fan(s) wiring diagram

https://eautorepair.net/Marketing/Default.asp

No engine told so the HUNT ENds. now.
2.2L or 3.1L? engine./ (USA choice day1 new , 2 engines)
the manual is clear.
rad fan rear? dead, it can be hot wire tested.!
the ECT sensor is used. on all modern cars,,
if PCM scans fail to show ECT failing it is no failing
it will read using any real scan tool PID live data ECT at 180F to 200F
the same manual tells you the trip point, to run the fan,most cars are about 220F, 165F is boiling so 220f is NOT TOO HOT.
if the ECT reads correctly to REALITy, it is NOT BAD ever.
we use an IR THERMAL GUN TO PROVE THAT IN SECONDS WORK.
IF ENGINE IS TOO HOT, AND FOR SURE FAN IS DEAD
THE ECT MAY BE IN AN AIR POCKET AND THAT MAKES IT LIE;.
MAKE SURE FIRST ALL AIR IS BURPED OUT OF THE COOLANT LOOP.
THE CAR HAS LOW COOLANT SWITCH, AGAIN SCAN PCM SEE IT FAIL?
THERE ARE 2 FANS AND 3 RELAYS THE PCM CONTROLS
RELAY 28,29,AND 30
AND FUSE 17 AND FUSE 18 FOR FANS
Engine coolant must be drained below the level of the engine coolant temperature (ECT) sensor.
HERE IT IS #1
F = FLY WHEEL MEANS TRANNY END OF ENGINE.
T= THERMOSTAT.

I BET IT IS GOOD AS 99% ARE REPLACED GUESSING
I'D SAY BAD FUSES X2,BAD RELAYS X3 FIRST.
OR AIR POCKET WHERE #1 RESIDES, LEARN PURGE AND BURP ALL AIR OUT OF THE COOLANT LOOP.
THE FANS ONLY RUN WHEN THE PCM WANTS TO OR ECT READ SUPER HIGH, 220f UP.
OK FOUND IT IN THE MANUAL


223°F) the low speed engine cooling fans should engage.

At 110°C (230°F) the high speed engine cooling fans should engage.

SO 223 AND 230F ARE THE TRIP POINTS
SO 200F NORMAL ,NEVER RUNS FANS

if the scan tool ECT sensors show 180f to 200f it is not overheating
what are you talking about.
blower dash fan.
engine RAD fans < guess only this.
or front AC condenser fans.
overheats parked
overheats driving yes or now fast?
oveheats only AC on, none of this told an matters HUGE.
learn to use a scan tool?
you can not fix any modern car lacking one. $100 buy one.
here are the proofs of over heating. al or most.!!!
dash gauge pegs, see that can be coolant low, easy no>?
scan ECT shows temps way over 200F, 265 is boiling point.
coolant on the ground AF 50% green,yellow orange pink what eva.
coolant on the passengers toes(foot well heater core leaks)
coolant in oil pan , and dip stick end drips, chocolate milk.
engine pings, or under load (hills) dont let it. pings is too hot. or dead EGR.
huge engine power loss from ping. (and lots more)
engine guts make huge nasty metallic sounds. bad that. check oil levels.
dash gauge engine heat PEGs , can mean overheating.
dash gauge tad high is normal. z(operators guide said so)

the service manual tells you clear as day what temps trip the fans on if you just RTM/ 214 to 220f , if ECT show that the fans run in that range and lacking a scan tool you will NEVER KNOW IT.
'the dash gauges is NOT and instrument it is a just a crude, toy gauge, the ECT is what matters period. or IR thermal gun pointed to thermostat housing then to top and bottom RAD tanks,


this magic tool and skills I can find dead RAD tubes in 1min flat
love mine, Have 2.

shows 170 here, or 180f if drive 5 miles. your car is 200f stat
a parting shot
no 19 year old thermostat run that long.
the top usa maker claims a 7 year design life
I bet yours is bad. as the wax pellet ages in it ,it shrinks and the TEMPS go way way too high, or are sluggish.
seen it vast times and is frankly normal service.

Over heating the engine is a serious concern. With the hood raised you should hear the motorized fan turn on just behind the radiator as the engine requires additional cooling.. If you look in from the rear of the radiator you should see the fan blades.

This electric powered motor operates on a thermostat and when the engine temperature rises this fan should come on. I'm assuming from your description that when driving and air is flowing through the radiator as the car travels the engine is nor overheating.

Check fan motor thermostat, check fan motor and check wiring.

Wiring Diagrams related to the Honda Civic
http://www.wiringdiagrams21.com/category/automotive/honda-automotive/civic

Motor engine cooling fan only runs as engine temperature requires additional cooling.

bad engine thermostat, seems/
heater light? are you saying the cab fan heater is poor heat.
or are you saying engine heat is slow to hit 180F+ ???????
the fan only comes on when you over heat engine.
or if A/C is on.
the fan electric on newer cars is controlled by the PCM
if the coolant never hits the programmed trip point, the fan never goes on. (bad thermostat or air in the cooling of engine block)
if coolant really is hitting say 220f, at idle or more, (fan test is in FSM read that page)
then the ECT may be fibbing. Scan it.
scan the PCM does the ECT read , true reality or not.
????
that is it.

No, the fans have separate relays. You have to use the wiring diagram to sort it out. The pcm turns on the cooling fan relay with a ground signal on a purple/black wire when the temp sensor signal rises too high.

Welcome to Fixya

Sounds like you have a problem with the cooling system. First thing you need to check first if the auxillary fans are working from the time you are the engine is overheating. If the auxillary fans is not working then the problem would be the aux fan itself or relays. if Fan is working then you might have a poblem with the water pump.

Thank you for using Fixya!

If you need further help, reach me via phone at https://www.6ya.com/expert/elixirjose_00375ea24bd8141b

You have two fan's on your truck, 1 is a fan clutch runs with the drive belt, 2 elec fan motor, with test light and engine running at normal temp, just a little bit above 1/2 way on your temp gauge check voltage at elec. cooling fan harness if you have voltage at one of the two wire's and fan don't turn on, bad cooling fan motor, on the fan clutch after you check voltage at elec. fan motor turn engine off, with your hand spin drive belt fan if it spin's freely bad fan clutch, replace it.Also check cooling level.Hope this was very helpful

test

Above is the diagram for a 4 cylinder. It appears that you might have a fusible link which looks like a regular wire instead of a regular fuse. If you have A/C on your car you can turn it on and this automatically should turn the cooling fan on. If I remember correctly these cars have problems with the Coolant temperature sensor located near the thermostat. It will have one yellow wire going to it. You can also try to swap the cooling fan relay with the horn relay or another relay that looks similar under the fuse block. There should be a diagram of the fuses and relays under the cover. Try with the engine off and key out try to turn the fan by hand. If it does not move freely the cooling fan motor is bad. Other than that you will have to bring to a shop to have the circuits tested... Good luck.

Sounds like the temp switch for the fan or the fan motor itself. To check run jumper wires from your batter directly to fan.. If it turns on, then you have a bad switch. If not , your fan motor is bad. I do not have a diagram for your car but finding wires from your fan assemble should be easy. Trace starting from fan. There should be a harness soon after the fan for you to connect jumper wires to to check fan. And by the way it does not matter witch way you hook the jumper wires up. It will only change the direction the fan motor turns. Just make sure you disconnect the harness so that you do not create a back flow of current.The reason for your coolant overflow to be getting excessive pressure is the heat in the system is causing boil over(the car is too hot).