Question about 2002 Honda Civic

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Connection between Climate CTRL and the Radiator Fan?

When the clim control is on the windshield or windshield&legs the radiator fan is working ON and OFF even if the engeen is could (just started in winter time). If the blower is turned OFF or the climate control is not on the windshield or windshield&legs the radiator fan stops.

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The cooling fan is designed to come on when the setting is in defrost or A/C mode . the a/c compressor is set up to come on in the winter to help keep the seals flexible by running and cooling fans run to help provide air across the condenser and radiator to cool engine water and makes a/c cold in summer time use . cooling fan will cycle as it reads data from related sensors. this is a normal condition with your car

Posted on Apr 18, 2015

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How do I fix cooling fans that run when car is off


Replace the fan relays. The Radiator Cooling Fan Motor Relay is located: Under hood, driver side, front side of strut tower, mounted in relay panel
Application:
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My chevrolet uplander radiator cooling motor fan only working, when the A/C is turn on. Any relay or fuse that I need to check?


It would be useful if you had mentioned whether it was a radiator cooling fan motor or a heater/ventilation fan.

It is usual for the cooling fan to switch on with the A/C is on unless the ambient temperature is quite low, otherwise it only operates subject to engine coolant temperature via a thermal switch fitted into the cooling system and/or the engine management system.

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Aug 22, 2015 | 2006 Chevrolet Uplander

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Radiator fans randomly shut off


  • Relays carry high-amperage current controlled by a low-current switch
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1999 Dodge Neon Issues (HELP)


Here's a link to the P0340 code,and P1491.Powertrain Diagnostics Manual P-1491 Radiator Fan control relay circuit
Set condition: An open or shorted condition is detected in the radiator fan relay control circuit.

Possibilities:
Fan relay ground circuit open
Fused B+ circuit open
Rad fan control relay defective
RF relay output circuit volt cycles over to batt voltage
RF relay control circuit open
RF relay ctrl rly ckt wir harness observable or intermittant defect
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Defective PCM

Get out your Multimeter.

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Need to replace radiator fan and its motor


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1 Answer

2000 durango cooling system fan running non-stop


Many engine control system faults can cause the radiator cooling fan to come on and run non-stop. Also, if your A/C is on or if you have your heating and cooling controls in DEFROST mode, this can cause the radiator cooling fan to come on (normal operation). Or there could be a cooling fan circuit malfunction (like a stuck relay) causing this to happen.

Check to see what mode your climate controls are in. If the climate controls are not in A/C or DEFROST modes, then you should have your engine control system properly diagnosed to determine the cause of the radiator fan being on continuously.

Also, if the Check Engine light is on, this is a clue that the engine control system is malfunctioning.

Nov 24, 2011 | 2000 Dodge Durango

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Fuel line burst causing fire ever since car keeps over heating and now its blown the head help please!!! I can fix the head but need any ideas on whym its overheating checked the thermostat it fine no...


Check that the fan is working properly, whether it is electric or a belt driven fan. A car will overheat if the fan doesn't function as originally designed.

Nov 04, 2011 | Cars & Trucks

1 Answer

1999 Jeep Cherokee Sport wont shift into overdrive P1491


P1491 - Radiator Fan Control Relay Circuit Open Or Shorted

When monitored: with the ignition key on, battery voltage greater than 10.0 volts and
the pcm requests the radiator fan to be turned on.
Set condition: an open or shorted circuit is detected in the radiator fan relay control
circuit.

Possible causes
radiator fan ctrl rly circuit wire harn intermittent defect
radiator fan ctrl rly circuit wire harn observable defect
radiator fan relay ground circuit open
rad fan relay control circuit open
radiator fan relay control circuit short to ground
rad fan control relay defective
pcm defective

Check ot and keep us updared.

Oct 15, 2011 | 1999 Jeep Cherokee

1 Answer

Have two codes 1490 and 1489 what are they and how do i fix them


It's most likely low speed fan control relay circuit trouble.
There are separate relays and control circuits for high and low speed for the fans. This way if one messes up the other one should still work. Relays are in relay/fuse block under the hood. There is a diagram under the relay box cover that shows the function of each relay. The relays just plug in.

1489 = High Speed Fan CTRL Relay Circuit - An open or shorted condition detected in the control
circuit of the high speed radiator fan control relay.

1490 = Low Speed Fan CTRL Relay Circuit - An open or shorted condition detected in control circuit of
the low speed radiator fan control relay.

Either the relays are gone or the connector isn't plugged in, probably the connector if both the low and high circuit is out.

May 06, 2011 | 1998 Dodge Intrepid

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