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Relay switch goes on and off. Fan is running.

Relay switch goes on and off. Fan is running. Not cooling

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The starter relay on the compressor may be faulty, I presume that is what you are hearing, a sort of click noise?

Posted on Mar 05, 2009

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Why the cooling fan on my car will not stop running?


The cooling fan has two wires going to it.
One goes to the ground, one to the "hot" wire.
The hot wire is connected to the sensor on the engine block that tells the fan to turn on whenever the engine temperature reaches a certain point.
I am thinking either the engine block sensor or possibly a relay in the electrical box under the hood has failed, and is sending electricity to the fan when it shouldn't.
Replacing the sensor or the relay will solve the problem.
God bless your efforts.

Jan 19, 2016 | 1999 Lincoln Continental

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How to wire a fan relay


A fan relay has 2 switches, a NC, normally closed switch
and a NO, normally open switch.
The relay has a coil that acts as an electromagnet and when energized with 24 volts from the thermostat will close the NO and open the NC switches.
The NO switch is the High speed , the NC switch goes to Low speed however as it is NC a temperature or time delay is what actually controls the low speed, low speed is the heat speed.
The NO switch in the fan relay goes directly to the High speed lead, this is the Cooling speed and the Fan On speed.
The 24 volt coil in the fan relay is wired to Green from the thermostat and Common 24 volt neutral leg.

on Oct 14, 2013 | Ruud Rheem Enclosed Fan Relay 42-25104-06...

2 Answers

2004 Chevy Monte Carlo 3.4 the a/c stopped blowing,then it started overheating to the red within a couple miles,replaced the thermostat,the relay switch some days it overheats sometimes it runs fine


Are the cooling fans coming on ? What relay switch did you replace ?
The BCM will request low speed cooling fan operation from the PCM under the following conditions:
?€¢
Engine coolant temperature exceeds approximately 103?°C (217?°F).


?€¢
When A/C is requested and the ambient temperature is more than 10?°C (50?°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 more than 117?°C (243?°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.


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 PCM to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the engine wiring harness junction block. The ground path is provided at G101.
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 FAN CONT #1 relay coil, closes the relay contacts, and supplies battery positive voltage from the FAN CONT #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 FAN CONT #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 FAN CONT #1 relay through the low speed cooling fan relay control circuit. After a 3-second delay, the PCM supplies a ground path for the FAN CONT #2 relay and the FAN CONT #3 relay through the high speed cooling fan relay control circuit. This energizes the FAN CONT #2 relay coil, closes the relay contacts, and provides a ground path for the right cooling fan. At the same time the FAN CONT #3 relay coil is energized closing the relay contacts and provides battery positive voltage from the FAN CONT #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.
Is your vehicles check engine light lit ?
Is the

Jul 10, 2015 | Cars & Trucks

1 Answer

Y does 2004 ac pontiac grand am


Need more info. Do you mean the blower doesn't seem to run or do you mean it doesn't cool sitting at a stop? Does the blower run at all four speeds? Raise the hood. Start the engine. Turn on the AC to MAX and fan switch set to High. Go to the front of the car and see if the radiator fan or fans if it has two, are working. If they aren't you need to check the cooling fan relay and possibly replace. Cavalier's have only a single fan (not two) so when the cooling relay goes out it doesn't cool at a stop and begins to overheat as well. Not sure if the Grand Am has one fan or two at the radiator.

Jul 11, 2014 | Vehicle Parts & Accessories

4 Answers

Why won't the fan motor shut off on my 1991 acura legend?


Hey chandralebea,

Try first by replacing the cooling fan engine temp sensor switch, as this may be the cause.



Good Luck

Jul 29, 2012 | 1991 Acura Legend

2 Answers

Radiator Fan Stays On


A simple test would involve disconnecting the fan switch while the fan is on. If the fan then stops the switch has failed. If the fan continues to run remove the relay , if the fan then stops the relay has failed.
Various inputs/outputs at the relay should be confirmed to be 100% certain something strange isn't going on.
Above all be careful of the fan itself , if it's running obviously but if it's not it could start during repair

Mar 01, 2010 | 2001 Buick LeSabre

3 Answers

Cooling fans will not come on


Hi,

Fan Relay switch is stuck open. This of course assumes your temperature sensor is working appropriately. Which I assumed since you seem to know that the engine is running hot.

Replace the fan relay switch. The relay switch is tripped when the temperature sensor tells the computer the engine is too hot.

Until you get the relay switch replaced, you can either by-pass the relay switch and directly connect the fans to the battery, or turn on your A/C ALL the time and use it at a minimum setting. This will keep the cooling fans running at all times.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Jul 26, 2009 | Volkswagen Jetta Cars & Trucks

2 Answers

Cooling fan for rad not working.. if relay is


either the relay has shorted out or the coolant temperature sensor has failed. start witht he relay, install a new one and see if the situation improves, if not then do the temp sensor.

Jul 18, 2009 | 2006 Chevrolet HHR

2 Answers

Fan will come on for heat(auto), but not for AC or set to ON


You have a blower relay in the furnace that's probably bad. In the heat mode the blower is on a temperature relay, in cooling mode the blower has to come on immediately so there is another relay for cooling. The green wire on the thermostat feeds that relay, so if you go to the furnace and shut the power off and find the green wire from the thermostat that feeds that relay and replace it, being careful to mark all the wires before removing them, also the relay terminals have numbers for identification.

Apr 07, 2009 | Heating & Cooling

1 Answer

1993 honda lx run cool while running ,but after it


check thermostat might be sticking or radiator may need flushing if it only heats up while idling check your electric fan may not be coming on try turning on the a/c the 2 cooling fans should come on then if they do then i would check the cooling fan switch if they do not come on when the a/c is switch on you may have a bad electric fan motor or wiring to the fan or fan relay

Feb 26, 2009 | 1993 Honda Accord

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