Question about 1987 Chevrolet Cavalier 4 Door

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Cooling fan won't come on, have tested fan and replaced temperature sensor.

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First question to you is.. Have you checked the wiring or ECU codes?




check the cooling fan switch on the back of the block, unplug the connector and jumper.
2 wires, turn ignition on and fan should come on...

if it does-----replace the cooling fan switch
if it doesnt----- go to the cooling fan relay on the pass side inner fender
panel behind the headlight and check it, besides the fan itself and the fuse, those are the only things in the system.

Posted on May 11, 2009

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  • Master
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Fan relay?

Posted on May 11, 2009

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Posted on Jan 02, 2017

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SOURCE: Engine cooling fan not turning on.

The electric motor can go bad like my Tbird has 2 times in 10 years.
Most Ford's have a Temp Switch and Temp Sending unit.
The Temp Switch tells the guage on dash the temp and the Temp Sending unit tells the computer how hot engine is and then kicks fan on (assuming all relays and fuses ok).
or at local "Mighty Mart" making you late for something important

Posted on Aug 06, 2008

  • 1 Answer

SOURCE: Replace Cooling Fan sensor unit

Located behind passenger headlight. Must cut small acess hole in plastic to acess.(directly behind where headlight mounts) Plastic cuts easily. Remove just enough to install new unit. It is blue and black in color with a plug in the bottom. Remove 2 mounting screws,Slide red connector lock back,and squeeze rear of connector to release.

Posted on Jun 03, 2009

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SOURCE: 2000 Caravan-Engine cooling fans not running, replaced temperature sensor and fan relay, still not working-HELP

Have you had the vehicle scanned yet? Can you turn on the fans by using a jumper wire at the electronic control near the headlight? The module is controlled by the engine computer in front of the battery. There could be a broken/corroded power or ground wire to the module or a broken/corroded control wire to the engine controller. Scanning the engine controller will help in the diagnosis if there is a code for the module control circuit. A test light an multi-meter will greatly aid in the diagnosis rather than just thowing parts at the vehicle.\

Doug

Posted on Jun 03, 2009

jagjeffery
  • 318 Answers

SOURCE: replaced cooling fan relays,the cooling fan

remove the cooling fan relay you should have power on the pink and black wire and the solid red wire going to the base for the relay if you do then check then turn the a/c on and check for your ground sigal from the darkgreen and white wire if no ground you have a bad fan control module located on the right side of the engine compartment

Posted on Jun 04, 2009

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SOURCE: 2003 Audi TT Quatro Coupe.

The main reason for the over heating of the audi tt is to do with the water pump. The propeller within the first type of water pumps is made of plastic. This was to prevent corrosion, however was never designed to last longer than 5 years. What you need to do is purchase the new style water pump. These new style water pumps have been designed with a metallic propellor which should resolve the overheating. Let us know how you get on.

Posted on Aug 17, 2009

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1 Answer

What is the difference between the Intake Air Temperature Sensor and the cool temperature Valve?


The Intake Air Temperature Sensor detects the temperature of the AIR being drawn into the engine intake. The ECM uses this do determine the proper fuel-air ratio as cooler air is denser than warmer air. The Cool Temperature Valve is actually called the coolant temperature sensor and tells the ECM the temperature of the coolant in the engine. The ECM uses this to control fuel delivery as the engine warms up (choke function), and it also uses this to control the turning on and off of the radiator cooling fans. In order to determine of the problem is the sensor or the fan circuit, a simple test is to start the engine and turn on the A/C. The cooling fans must run at all times when the A/C is on. If they are not running, it is not the coolant temperature sensor, but a problem in the fan control circuit.

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Where are the sensors for radiator fan merc.2002 villager


Sensors for radiator Fan ? What sensor ? The coolant temperature sensor is an input to the PCM - engine computer ! When the engine temperature reaches 200 degree's the PCM energizes 1 to 3 Cooling fan relay's in the battery junction box (fuse-relays ) The low speed fan relay , High speed fan control relay 1 , an high speed fan control relay 2 . Now what problem are you having ? Go on you tube an check out videos on testing cooling fan's , testing relay's .Before you replace a sensor you don't need too .

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2000 radiator fan test, is there any way to test the fan before o get a new one


check cooling fan fuse or fuse link.it all is good. fan relay or engine coolant temperature sensor.could have ECM FAULT it controls coolant fan relay and coolant fan.code scan for ECM FAULT YOU WILL SEE CHECK ENGINE FLASH IF PROBLEM IN THE ECM.but check cooling fan hot wire it using jumper wires to battery.if fan okay replace engine coolant temperature sensor.

Feb 20, 2013 | 1999 Volvo S80

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Engine cooling fan only works when ac or defrost is on


if engine at long stand still,the engine temperature will rise about 190 degrees the cooling fan suppose to automaticaly turn on when coolant temperature sensor get hot it cause its resistance decrease causing pcm to send power to coolant fan relays and cooling fans, when you turn on AC the cooling fans suppose to turn on to cool down AC CONDENSOR, IF NOT AC WONT WORK COOLING FAN COOLS DOWN REFRIGERANT SO IT CAN RECYCLE THROUGH THE SYSTEM AGAIN.your cooling is suppose to turn on when engine at a sit still if vechicle not moving as coolant temperature rises at a set point the cooling fans will turn on cool down engine.cooling fans dont turn on when you first cold stsrt vechicle unless you have AC SWITCH ON.if cooling fans dont turn on when vechicle at a long stand still or moving along slow traffic.if coolant temperature sensor been replaced and fuses and relays okay have dealership check see if pcm driver circuit working faulty pcm will cause cooling fans not to turn on.

Sep 27, 2012 | 1996 Buick Century

1 Answer

Why won't my cooling fan turn on?ive checked the


ive been told that the cooling fan wont come until it gets hotter then mid range

May 09, 2012 | Honda Civic Cars & Trucks

1 Answer

Cooling fan does not come on


This is controlled by a cooling fan sensor/temperature sensor, as well as fuses, and a relay. These will have to be checked.

Make sure your coolant level is full, the coolant temperature switch won't work if the level is too low. If coolant is low, you need to find out where it went to by pressure testing the cooling system.

If it's not low and the fuses are good, the relay is working:

The fan should be tested, bypassing any sensors to make sure it is functioning properly.

The sensors can be tested to be sure they are working properly at the correct temperature with a voltmeter/ohm meter.

Reverse troubleshooting the wiring and ignition is the next step if you haven't found the problem.

Good luck !

Mar 29, 2012 | 2005 Kia Sorento

2 Answers

Cooling fan quit running and i cant find relay


Relay may be ok, check the temperature sending unit that signals the relay to run the fan, it may just provide the ground for the cooling fan! Temperature sensor for the cooling fan circuit!

Sep 06, 2010 | 2006 Chrysler PT Cruiser

3 Answers

The radiator cooling fan is not working. Upon


assuming fuse and relay are good..no fan should be running when the engine is cool/cold, the only time the fan should be running when it reach over operation temperature which then the fan kick on to bring the temperature back down to it operation temperature. both fan work in sync with one another, addition cooling is needed when the ac is running. when the last time have you replace thermostat and Thermos sensor/switch. I would replace both unit if you have not done so. The thermos/switch will turn the fan on when it reach certain temperature and cut off when it sense the temperature drop in the engine.

Aug 25, 2009 | 1999 Lincoln Town Car

1 Answer

I have a 95" model ford aspire. Right now am experiencing a problem on mostly the fuel gauge and the cooling fan. the gauge does not indicate the amount of gas, while the cooling fan does not run. What...


cooling fan has a relay. check it first. Then check the ECT, Engine Coolant Temperature Sensor. It is on the engine and sends a signal to the PCM, Engine Computer.
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Section 03-03: Engine Cooling 1996 Aspire Workshop Manual
DESCRIPTION AND OPERATION Cooling Fan, Electric sty~us~en~file=ani_caut.gif~gen~ref.gif WARNING: WHEN WORKING IN THE ENGINE COMPARTMENT, STAY CLEAR OF THE FAN BLADE. BECAUSE IT IS ELECTRIC AND TEMPERATURE SENSITIVE, IT CAN START AT ANY TIME IF THE IGNITION IS ON.
The electric cooling fan is an electro-drive type. Its operation depends upon engine temperature and ignition switch (11572) position. If engine coolant temperature reaches 97°C (207° F) and the ignition switch is in the ON position, the engine coolant temperature sensor (ECT sensor) (12A648) sends a signal to the powertrain control module (PCM) (12A650) which turns the engine cooling fan motor (8K621) and fan blade assembly on. Because it cannot operate unless the ignition switch is ON, the engine cooling fan motor and fan blade assembly does not operate after engine shutdown. The fan control relay (FC relay) is located in the LH front corner of the engine compartment, between the battery (10655) and the headlamp assembly. Circuit protection is provided by a 30A fuse labeled COOLING FAN in the main fuse junction panel to the left of the battery. If the vehicle is equipped with air conditioning, an additional relay is installed in the circuit. The A/C clutch control relay (19D572) bypasses the engine temperature portion of the circuit. The bypass circuit allows the engine cooling fan motor to operate whenever the A/C switch is engaged.
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Fuel pump/sender access is through cover under rear seat.


Fuel Gauge

  1. Remove the instrument cluster. Refer to the procedure in this section.
  1. Using a jumper, connect the battery positive terminal to the fuel gauge "+" terminal and the battery negative terminal to the fuel gauge "-" terminal.
  1. Connect one lead of a Rotunda Instrument Gauge System Tester 014-R1063 or equivalent to the "F-U" terminal of the fuel gauge (9280), and connect the other lead to the "-" terminal of the fuel gauge.
  1. Adjust the instrument gauge system tester to the resistances shown in the illustration.


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  1. If the fuel gauge does not operate as specified, replace the fuel gauge. If the fuel gauge is OK, return to the Pinpoint Test.


Fuel Level Sensor

  1. Remove the fuel level sensor (9275). Refer to Section 10-01 for the removal procedure.
  2. Measure the resistance between terminal A and terminal B of the fuel level sensor.

    Connector Shown From Component Side
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  1. Adjust the fuel tank float to the following positions:
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  1. If the resistances are not as specified, replace the fuel level sensor. If the fuel level sensor is OK, return to the Pinpoint Test.
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Mar 27, 2009 | 1995 Ford Aspire

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