Question about 1992 Toyota Corolla

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Cooling system fan

I have the same problem as attitudechec that the fan is not working but car is not overheating can you tell me where the relay is

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Try checking the fan by unplugging it then using a jumper wire connect one end to the positive and another to the negative directly from the battery.the fan should run smoothly and at the accurate speed using 12 volts. if it does not run, the fan motor is bad and has to be replaced. if it does run, a relay or fuse may be breaking the circuit. check the fuse box inside the cab and the relay fuse box under the hood.

Posted on Nov 20, 2008

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FANS WONT COME ON ,,ALL FUSES,RELAYS AND ELECTRIC FAN MOTORS ARE NEW,,THERMOSTAT IS GOOD,,WHERE IS ELECTRIC FAN TEMP SENSOR LOCATION


op
why not post symptoms first and not a barrage of parts.
must we decode that to a symptom,. kinda hard right.

I will not guess. what is wrong, nor what is not working on your car. now what fans you are talking about, up to 4 fans on cars.

cab blower fan (wild guess blower is ok) and so is HVAC, ?
radiator fans
Condenser fan.

my wild guess to , engine over heats?????????
if yes, the scan it first. no not last FIRST.
it dont work like you think its not a 1988 Samurai.
sorry,
on modern cars, they got smarter, the engine goes
gee the PCM knows water temp why have a fan temp regulator.
hark , now it dont. (saves cash on useless parts)
but has a relay , (well until you have my car and the relay is now 100% electronic, called a huge transistor)
we've used this tech in industry for years, but car makers just learning how still.
i digress. but evolution and history helps diagnosis.
what is there?

Ill look for you, ive posted this 100s of times
the book is 4 bucks to see online. the real deal
lets look now.
XL-7 (the dash matters big time)
answering for , overheats engine, and fans on RAD dead.
(some are staged, PCM brains... now. and also chain ops based on if A/C is on or not) facts.
first I see 2 fans... ok.
the next page shows nice block diagram of the fan system
yup, NOT Simple.

ill post those words for you.
"The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the engine control module (ECM) to operate both fans together at low or high speeds. The cooling fans receive positive voltage from the cooling fan relays which receive battery positive voltage from the underhood fuse block.
During low speed operation, the ECM supplies the ground path for the low speed cooling fan relay which is fan 1 relay through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the fan 1 fuse through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the series/parallel relay which is fan 2 relay, and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. The ECM grounds the high speed fan relay, which is fan 3 relay, and the series/parallel relay, which is fan 2 relay through the high speed cooling fan relay control circuit. This energizes the series/parallel relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the high speed fan relay coil is energized closing the relay contacts and provides battery positive voltage from the fan 2 fuse 1 on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.
When the request for fan activation is withdrawn, the fan may not turn OFF until the ignition switch is moved to the OFF position or the vehicle speed exceeds approximately 16 km/h (10 mph). This is to prevent a fan from cycling ON and OFF excessively at idle.
end quote.

i bet you didnt scan it , like 99.9 % of all posters here dont.
DTC Descriptors
DTC P0480: Cooling Fan Relay 1 Control Circuit
DTC P0481: Cooling Fan Relay 2 Control Circuit
DTC P0691: Cooling Fan Relay 1 Control Circuit Low Voltage
DTC P0692: Cooling Fan Relay 1 Control Circuit High Voltage
DTC P0693: Cooling Fan Relay 2 Control Circuit Low Voltage
DTC P0694: Cooling Fan Relay 2 Control Circuit High Voltage
Diagnostic Fault Information

is the ECT showing overheat, yes no?
if yes, it must operate a fan or 2.
the book even covers all tests for fans dead, in a large truth table.
both the FSM and alldata.com have that, its no secret ,its published in 4 major places.

lets back up
if the engine coolant is low (no that side tank the engine and rad)
the ECT will lie. if that happens the fans may not come one
that is because the ECT is useless measuring air, for water.
that water must touch ECT for ECT to work.
this is FIRST
then scan the ECT does it show overheating, IT must if it IS overheating. fix that next if it lies to you,(IR gun in hand)

The system has staged fans.
i cant find the trip points in my crappyy online pages.
but is like 225f then 250f trips. is my guess...
about. if the engine over heats, check fuses first then scan it.
it will simply tell you why its bad.
eg, fan1 output dead.
or if you hot wire a fan and its dead, then it is.
(only on cars with non modulated fans,,hot wire them,else not.)

now the link to the 4 buck real book.
the non dash XL7 (my guess) you this pick yourself... cant see car.
https://suzukipitstopplus.com/Products/10182-2007-xl7-service-manual.aspx

this is how it really works
the ECU has software that decide trip points for fans.
hard coded, this is. based on how hot it is and if A/C is on not.
its way smarter than 1988 and better.
the DTC errors can see an open line, shorted to ground or stuck 12v.(runs all time error)
(tells you relay is good or not)

25839272-0kjd5huq4lpr130nt243wle5-3-0.jpg no scanner no joy , sorry, tis a fact.....

25839272-0kjd5huq4lpr130nt243wle5-3-2.jpg

Aug 27, 2015 | 2007 Suzuki XL-7

1 Answer

Cooling fans don't work


Did you recently change the coolant or have it changed? The system needs to be 'bled' or 'burped' of any air in the system. I did this for a friend once to fix an overheating issue.

There is likely a relay for the fans or the coolant temperature sensor that is bad. You'll need to get a Haynes repair manual (library) or look online for a service manual for your car...also, search the online dodge/plymouth/chrysler forums.

My guess is the relay that is bad IS causing a fault to ground that is draining the battery, too.

You could just remove the Negative battery terminal every night 'til you get the fans figured out.

Since it's overheating while idling it could be:
-water pump
-thermostat
-radiator plugged
-low coolant

Unfortunately, these engines have a history of blowing the head gaskets, too.


GL,
Td

Oct 03, 2012 | 2004 Dodge Intrepid

1 Answer

1997 Dodge Avenger Missing Radiator relays


It is common for some relay positions to not be used on many cars. These are places for relays that control things that your vehicle is not equipped with. For example, if your vehicle is not equipped with fog lamps, the spot where the fog lamp relay would go will be empty and there will be no connectors in that spot either.

As for your overheating problem, it needs to be properly diagnosed. Most Dodge engines are VERY unforgiving when it comes to being overheated. Even if it was not caused by a blown head gasket, there is a really good chance that it has one now.

Combustion gasses in your cooling system can keep your fans from running, because the gasses push the water down and away from the Engine Coolant Temperature (ECT) sensor that tells the Powertrain Control Module (PCM) when to operate the fans.

Your Avenger is actually equipped with four different fan control relays. It is very unlikely that all of the relays would be bad (or missing).

Proper diagnosis required.

Jun 15, 2012 | 1997 Dodge Avenger

1 Answer

Fan comes on when switch ignition on instead of when hot Tazz


If the fan not turning on when car engine getting hot,then car will notice overheating.Click this link below for troubleshooting:---http://technoanswers.blogspot.in/2012/02/car-running-hot.html--------To know how engine cooling system works ,click the link below :----Engine cooling components working?

http://repairhelpcenter.blogspot.com/2011/11/engine-cooling-components-working.html

------------------
How does Vehicles Engine cooling system works? http://repairhelpcenter.blogspot.com/2011/11/how-does-vehicles-engine-cooling-system.html
------------How to Replace Engine cooling Fan:-- http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-engine-cooling-fan-on.html
-----------Replace Fan Relay but still Radiator cooling fans not working? http://schematicsdiagram.blogspot.com/2011/12/replace-fan-relay-but-still-radiator.html
----------DIC says "COOLING FAN FAULT"? http://schematicsdiagram.blogspot.com/2011/12/dic-says-cooling-fan-fault.html
---------Where Is Radiator Fan relay and Fuse Located?

http://schematicsdiagram.blogspot.com/2011/12/where-is-radiator-fan-relay-and-fuse.html

--------

This will help.

Thanks.

Feb 09, 2012 | Cars & Trucks

1 Answer

My raditor fan stays on in my 1997 town and country


cooling fans stay on, engine could be overheating, faulty cooling fan relay or pcm could be faulty.best get vechicle code scan before spending too much money you need scan to see what engine coolant temperature is,scanner can tell you if engine getting too hot could have partially closed thermostat,clogged radiator cores clogged engine block coolant passages clogged also the heater core, if engine not overheating the code scanner will tell you if you have faulty cooling fans relay or pcm failure.

Dec 15, 2011 | 1997 Chrysler Town & Country

4 Answers

My 1997 cadillac eldorado overheats plugs, thermostat, water pump, intake value have been replaced and still over heats.


Make sure the air in the cooling system is bled out,and make sure the cooling fans are coming on,and going off on there own.If they come on,they have to go off too,when it cools down.If the cooling fans do not come on,bled the cooling system,and replace the coolant sensor,this tells the computer to activate the cooling fan relays.Also check the fuse,and the cooling fan relay.

Apr 14, 2010 | 1997 Cadillac Eldorado

1 Answer

My1996 acura is overheating but my fans does not come on


check tempature switch for the cooling fans or maybe a bad fan relay check all cooling fan fuses,relays,if that doesn't work the theres a sensor on the engine that tells them when to come on

Nov 13, 2009 | 1996 Acura TL Series

1 Answer

At first the ac stopped cooling. then the car overheated with the ac off. there appears to be no loss of radiator coolant


Turn your engine on with the A/C on high. Watch your cooling fans mounted behind the radiator to make sure they are running. If they're not running, you have something wrong in the electrical side of the fan system. The cooling fans are essential for cooling as they pull air through the radiator when the vehicle is not moving fast enough to cool the coolant. The problem probably lies in a relay, so replace the high speed fan relay with one you know works but is not essential for moment (rear window defrost or something similar) and put that in the relay spot for the high speed fans. If the fans kick on now, you need to replace your relay and this will probably also fix your overheating.

Jul 12, 2009 | 2002 Mazda 626

1 Answer

2002 jeep cherokee overheating AGAIN


You say you changed the fan relay and the thermostat? when was the last time you had the cooling system flushed? you could have a blockage in your cooling system that could be keeping the coolant from circulating..

May 25, 2009 | 2002 Jeep Grand Cherokee

1 Answer

2000 Plymouth Voyager Overheating


The radiator cooling fan relay has most likely failed. It is underneath the air cleaner on the frame rail just behind the radiator. NO cooling fan = overheating. This is the first thing i would look at. Best way to tell is when the van gets hot see if the cooling fan is on. You will hear it running if it is coming on. It will set a code for the cooling fan relay also.

Feb 17, 2009 | 1998 Plymouth Voyager

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