Question about Buick Century

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Cooling fan relay not working - Century Buick Cars & Trucks

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  • arwennov68 Sep 27, 2008

    Having a relay issue with my fan. Now that I know what the problem is, I need to fix it, but don't know which relay is connected to the fan. Haven't been able to find a book and REALLY need it fixed ASAP as the car is overheating. Any idea where the relay to the fan is on a 97 buick skylark 2.4 liter?

  • penpen220 Nov 27, 2008

    I have a 1992 buick century and the cooling fan is not working. It will work when connected to battery and all the fuses are good. What else could it be?

  • Kathy Barnett Jan 18, 2009

    I have the same problem with my 1988 le sabre. I found 2 relays in the front driver's side, but the numbers don't match the numbers on the new relay I bought. One of them looks like the same "plug" pattern as the new part. Should I try it?

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The relay is easily replaceable. Either a gray or black box located on the passenger side, front of the engine compartment mounted to the frame that the radiator mounts to as well, there should be 4(that's how many my 94 Century 3.0L has) of the relays side by side, readily visible when you open the hood. Using a new relay, you can test each relay one at a time switching them out, until you find which one activates your cooling fan. On the flip side, it is an electric fan, so it only turns on typically when your engine exceeds 200+ (i think it's 225) degrees, or you activate the a/c on max setting, so maybe it's possible that it does operate under those conditions, but you're not able to witness it...? good luck, I chased that issue on my Century for quite some time...

Posted on Dec 08, 2008

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Check fuse, check for voltage at the relay, if so then change the relay.you can try interchanging with other same relay for test...

Posted on Jul 21, 2008

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jagjeffery
  • 316 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

  • 199 Answers

SOURCE: where is the fuse or relay for the cooling fan in

You have to refer to your owners manual or an after market service manual for fuse locations but that is not the issue. There is a sending unit screwed into the block with a temp sensor that closes the circuit on the ground side when the cooling system reaches a specified temperature. There is a fuse between the hot side and the fan for over current protection (see manual). A bad sending unit is most likely the culprit. Measure the resistance or continuity when the engine is hot from the sending unit body which is grounded to the block, and the output terminal or black wire running to the fan motor. It should be closed or read less than 0.5 Ohms. If it is open or very high resistance replace it. Good luck to you. I hope thishelps

Posted on Jul 26, 2009

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During low speed operation, the PCM supplies the ground path for the low speed fan 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 low fan 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 cooling fan s/p relay and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. After a 3 second delay, the PCM supplies a ground path for the high speed fan relay and the cooling fan s/p relay through the high speed cooling fan relay control circuit. This energizes the cooling fan s/p 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 high fan fuse on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have there own ground path. The result is a parallel circuit with both fans running at high speed.
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So ,what's the problem Paul , car overheating ? Fans not working ?
During low speed operation, the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the cooling fan 1 relay coil, closes the relay contacts, and supplies battery positive voltage from the cool fan 1 fuse through the cooling fan motor supply voltage circuit to the right cooling fan. The ground path for the right cooling fan is through the cooling fan 2 relay and the left cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the PCM supplies the ground path for the cooling fan 1 relay through the low speed cooling fan relay control circuit. After a 3-second delay, the PCM supplies a ground path for the cooling fan 2 relay and the cooling fan 3 relay through the high speed cooling fan relay control circuit. This energizes the cooling fan 2 relay coil, closes the relay contacts, and provides a ground path for the right cooling fan. At the same time the cooling fan 3 relay coil is energized closing the relay contacts and provides battery positive voltage from the cool fan 2 fuse on the cooling fan motor supply voltage circuit to the left cooling fan. During high speed fan operation, both engine cooling fans have there own ground path. The result is a parallel circuit with both fans running at high speed.
The PCM commands Low Speed Fans on under the following conditions:
?€¢
Engine coolant temperature exceeds approximately 106?°C (223?°F).


?€¢
When the A/C is requested and the ambient temperature is more than 50?°C (122?°F).


?€¢
A/C refrigerant pressure exceeds 1310 kPa (190 psi).


?€¢
After the vehicle is shut off if the engine coolant temperature at key-off is greater than 140?°C (284?°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.

The PCM commands High Speed Fans on under the following conditions:
?€¢
Engine coolant temperature reaches 110?°C (230?°F).


?€¢
A/C refrigerant pressure exceeds 1655 kPa (240 psi).


?€¢
When certain DTCs set.



So

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1 Answer

My ac is not working I have a Chevy Tahoe 2005 the fans won't turn on either .


Hi Maria , The A/C system wouldn't keep the fans from running but none working cooling fans will keep the A/C from working ! This is a fairly complex system if your not familiar with this sort of thing ! I will add the description from the factory service manual.
Cooling Fan Control - Two Fan System
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 powertrain control module (PCM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block.
During low speed operation, the PCM supplies the ground path for the low speed fan 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 low fan 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 cooling fan s/p relay and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. After a 3 second delay, the PCM supplies a ground path for the high speed fan relay and the cooling fan s/p relay through the high speed cooling fan relay control circuit. This energizes the cooling fan s/p 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 high fan fuse on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have there own ground path. The result is a parallel circuit with both fans running at high speed.
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FAN NOT WORKING


It can be issue with faulty motor or its faulty fan control relay.


Bother are to be inspected.

Test volt at fan relay and fan motor.

-------------

For more help, I suggest you to go through the troubleshooting links mentioned below:-----

Click the link below: ------

How to replace Cooling Fan on Acura Car models?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-cooling-fan-on-acura-car.html

--------------

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http://schematicsdiagram.blogspot.com/2012/11/obd-code-p1490-low-speed-fan-relay-ckt.html

---------------

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

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------------

These will help.

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3 Answers

Fan won't work


It can be issue with faulty motor or its faulty fan control relay.
Bother are to be inspected.Test volt at fan relay and fan motor.-------------
For more help,i suggest you to go through the troubleshooting links mentioned below:-----Click the link below:------

How to replace Cooling Fan on Acura Car models?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-cooling-fan-on-acura-car.html
--------------

OBD Code P1490 low speed fan relay ckt open-short
http://schematicsdiagram.blogspot.com/2012/11/obd-code-p1490-low-speed-fan-relay-ckt.html
---------------

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

----------

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http://repairhelpcenter.blogspot.com/2011/11/how-does-vehicles-engine-cooling-system.html

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http://schematicsdiagram.blogspot.in/2012/02/hyundai-sonata-cooling-fan-not-working.html

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http://repairhelpcenter.blogspot.com/2011/10/fuel-pump-relay-and-cooling-fan-relay.html
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http://carbeltrouting.blogspot.com/2011/12/fan-belt-routing-diagram-for-2004.html
---------

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http://carbeltrouting.blogspot.in/2012/02/timing-beltdrive-beltserpentine.html
-------------

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http://technoanswers.blogspot.in/2012/02/ac-heater-defroster-fan-not-working.html
---------

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http://technoanswers.blogspot.in/2012/02/blower-fan-not-running-on-isuzu-trooper.html
---------

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http://repairhelpcenter.blogspot.com/2012/01/how-to-replace-blower-motor-fan.html
----------

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------------These will help.Thanks.

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1 Answer

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

--------

This will help.

Thanks.

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1 Answer

My radiator fan is not working


For radiator replacement procedure and radiator problem troubleshooting. I suggest you to click the link below and follow the detailed procedure :-----

------------

How to Replace Engine cooling Fan on car? http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-engine-cooling-fan-on.html

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-----------

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--------

Cooling fan relays location? http://technoanswers.blogspot.in/2012/02/cooling-fan-relays-location-on-1998.html----------DIC says "COOLING FAN FAULT"? http://schematicsdiagram.blogspot.com/2011/12/dic-says-cooling-fan-fault.html
------------

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http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-cooling-fan-on-acura-car.html

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

-------------
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----------

cooling fan not working http://schematicsdiagram.blogspot.in/2012/02/hyundai-sonata-cooling-fan-not-working.html----------- Fuel pump relay and cooling fan relay troubleshooting? http://repairhelpcenter.blogspot.com/2011/10/fuel-pump-relay-and-cooling-fan-relay.html

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http://technoanswers.blogspot.in/2012/02/ford-windstar-transmission-fluid.html


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http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-radiator-on-audi-and-vw.html

----------
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http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-upper-radiator-hose.html

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http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-lower-radiator-hose.html

-------------
How to replace Radiator on Car models?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-radiator-on-acura-car.html

------------
How to flush cars radiator?

http://repairhelpcenter.blogspot.com/2011/11/how-to-flush-cars-radiator.html

--------
HOW TO PRESSURE TEST A RADIATOR AND CAP

http://schematicsdiagram.blogspot.com/2011/07/how-to-pressure-test-radiator-and-cap.html

----------------
HOW TO REPLACE A RADIATOR

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-radiator.html
------------------

HOW TO REPLACE A RADIATOR SUPPORT

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-radiator-support.html

-----------

This details will help.

Thanks.

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