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How to change cooling fan relay

2000 chevy metro

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There are 3 of them. Relays rarely go bad. Could be the wires or PCM.

Posted on Dec 24, 2016

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Posted on Jan 02, 2017

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Its a 2000 chevy metro that overheated. there are no leaks and the coolant levels are full. its still overheating on short drive and smoking. is it a head gasket? cylinder? water pump? thermostat??


It could be a number of things. You need to have your cooling system trouble shoot. It could be something simple as a stuck thermostat or as extreme as a cracked head. You will need to find a mechanic that has a thorough understanding of cooling system operations.

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Where is the cooling fan relay switch located on a 2000. Chevy venture


Which one ? your van has three cooling fan relays an two fans ! The relays are located in the under hood fuse box # 9, 10 , 12 ! Relay Driven Dual Cooling Fan Diagnostics

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The headlight relay provides power to the dimmer relay, then power goes thru a fuse for each light for each circuit (4). The low beam fuses are in fuse block 2. The dimmer relay is controlled by the daytime running light module. The headlight and dimmer switches send signals to the DRL module. You may need a shop manual to troubleshoot the circuits.

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I have a 2000 chevy malibu with obvious electrical problems. blinkers and flashers rarely work, no dash lights, terrible radio signal, and car runs hot when stopped for too long. We Just replaced the fans...


Cooling Fan Operation
The Electronic Control Module (ECM) regulates the voltage to the cooling fan relay. The relay operates the fan when the engine coolant temperature exceeds 106°C (223°F) The cooling fan will turn on automatically during extended idle conditions under 5 miles per hour. For diagnosis and location of the relay, refer to Electrical Diagnosis.

Relay Driven Dual Cooling Fan Diagnostics

Electric Testing Techniques You Need to Know
Do you know what a wiring diagrams is ? free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine ! Under system click on engine then under subsystem click on cooling fans . Click the search button then the blue link .

Test the electrical circuits before replacing parts !
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
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Condenser Fan on my 2000 Geo Metro will only run when connected to battery? What's wrong?


CHECK FAN FUSE AND RELAY.IF FUSE RELAY GOOD IF FAN DONT RUN WHEN ENGINE GET HOT YOU COULD HAVE FAULTY COOLANT TEMPERATURE SENSOR.

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1999 Chevy Metro Engine Fans don't work


Have you tried running wires directly to the battery to see if the fan motor works or needs to be replaced. Just get some number 10 or 12 electrical wire and run them to the battery. Try that maybe it's just that your fan motor needs to be replaced. Thanks for using Fixya.com...........Enjoy your evening : )

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The engine fans do not come on.


befor you do that check the gorunds on the fan motors. jump the fan fuse so it's always on with the key on and ground the fan to the block or frame. if the fan comes on you don't need to worry about the ignition switch

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2001 Chevy Venture Cooling Fans always running on high


either the temp sensor is bad but, it sounds like the fan relay is stuck.
replace the relay its in the fuse box.

Mar 23, 2009 | 2000 Chevrolet Venture

3 Answers

Van chevrolet venture 2000


Fifteen minutes! you have bigger problems than only the fans the fans are controlled by a thermo switch that is heated by the coolant, If you have no coolant the sensor cannot activate But fifteen minutes seems like you may have a headgasket problem and steam cannot heat the coolant sensor.OperationNotesThe electric cooling fan operates when the engine cooling temperature exceeds a certain value. The cooling fan on this engine is controlled by the Powertrain Control Module (PCM) . The PCM turns the cooling fan ON by grounding the coil of the cooling fan relays when certain conditions are met. When the A/C is requested, the cooling fan will also be turned ON.

Power for the cooling fan motors are supplied through Maxifuses(R). The cooling fan relays are energized when current flows from the fuses in the Underhood Accessory Wiring Junction Block, and through the relay coils to ground through the PCM. The Coolant Fan 1 Relay Control Circuit is grounded for low speed fans operation. During low speed fans operation, both fans run at a slow speed. The Coolant Fan 1 Relay Control Circuit is grounded for high speed operation. During high speed fans operation, both fans run at high speed.

IMPORTANT: When certain Diagnostic Trouble Codes (DTCs) are present, the PCM may command the cooling fans to run all the time. Perform the A Powertrain On Board Diagnostic (OBD) System Check prior to diagnosing the engine cooling fans.

For more information regarding the Charging System, refer to Charging System Description , and Charging System Circuit Description in Starting and Charging.

If a problem that involves the low speed cooling fan relay control circuit exists, DTC P0480 Cooling Fan Relay 1 Control Circuit should set. If the problem affects the high speed cooling fan relay control circuit, DTC P0481 Cooling Fan Relay 2 Control Circuit should set. A problem with the ECT sensor should set DTC P0117 Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage, DTC P0118 Engine Coolant Temperature (ECT) Sensor Circuit High Voltage, DTC P1114 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage, DTC P1115 Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage. Any of these DTCs will affect cooling fan operation and should be diagnosed before using the Electric Cooling Fan Diagnosis.

For more information regarding the Cooling System refer to Engine Cooling Fan Description - Electric, and Cooling System Description in Cooling System.


Here is the electrical schematic and how it all is suppose to work,
If you need any further help please contact me Thank you,Randy If you find this information helpful please give me a good rating

www.aceautomotive1.com

Aug 16, 2008 | 2000 Chevrolet Venture

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