Question about 2007 Yamaha V Star 1300

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How do i check the coolant sensor. my fan is not coming on and i thought it might be the sensor. Is there a fan relay?

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Hi cross the two wires at the fan switch with the ignition on if the fan works it's the switch. If not check fuze if that's ok you need a fan. Regards Jim...

Posted on Apr 11, 2015

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Posted on Jan 02, 2017

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I have a 08 nitro that the cooling fan never comes in causing over heating I've replaced water pump radiator heater core because it was bad the relay seems fine power coming in and out but no fan on


check fuses and coolant temp sensor
the coolant temperature sensor unit ( that is SENSOR not gauge sender unit) sends a report to the ecm to turn on the radiator fan when the temp is reached
If the fan is not coming on then the circuit is broken--sensor, wires ,fuses relay, fan-ecm
all have to be checked out

Jan 09, 2017 | 2008 Dodge Nitro

1 Answer

Engine fan won't come on


IF COOLANT FAN FUSE AND RELAY OKAY.HOT WIRE COOLANT FAN TO SEE IF FAN MOTOR OKAY.IF FAN MOTOR OKAY.THE ENGINE COOLANT TEMPERATURE SENSOR MORE LIKELY BAD.THE ENGINE COOLANT SENSOR WHEN ENGINE COOLANT GETS HOT IT CAUSES ENGINE COOLANT TEMPERATURE RESISTANCE TO DECREASE CAUSE COMPLETE CIRCUIT IN WHICH POWER FROM PCM TO ECT SENSOR WILL SENT POWER TO COOLANT FAN RELAY THEN CAUSE COOLANT FAN TO TURN ON. HAVE ECT SENSOR OR ENGINE COOLANT TEMPERATURE SENSOR CHECK USING CODE SCANNER TO MAKE SURE ITS WORKING BEFORE SPENDING EXCESS MONEY.

Jun 18, 2011 | 1998 Ford Taurus

1 Answer

Fan will not come on by itsself. Where is the coolant sensor located?


coolant temp sensor is usually located on the radiator. also check fan fuse, fan relay (in fuse box and relay box), and intake air temp sensor (thats usually on the intake tubing before throttle after Mass air flow sensor)(can be check with diag scan tool specific for that vehicle). if the fan is on a belt, check the fan belt and check for rotted or broken wires going to the fan motor.

May 04, 2011 | Chrysler LeBaron Cars & Trucks

1 Answer

I have a 2008 Town and Country and the temp gage gets to dead center and I smell antifreeze. Never remember the gage ever reaching the center before either. So I Checked to see if the radiator cooling fan...


ok this might sound crazy but you say you smell coolant but never said if you checked to see if it was full posible bad coolant temp sensor or no coolant passing the sensor please more info on coolant usually if low coolant fan will stay on however you say you smell coolant. If the coolant sensor is bad fan wont command on it will have a high resistance a low coolant temps and low at high temps. I would check sensor since its obviously getting hotter than half way if you dont have coolant leak the relay behind the head light by the way is a common problem I would have just changed it if its original and it grounds to body thats why it is riveted however you can bolt them. Hope this helps check for thermostat opening at right temps to.

Jan 07, 2011 | 2008 Chrysler Town & Country

1 Answer

1999 Olds Alero 4 cyl running hotter than normal. One mechanic says it's Heat sensor that opens and closes. The other mechanic who ran car says it was thermostat that turns on dual fans. Ok well one was...


REPLACE THERMOSTAT.ITS STICKING CLOSE TO KEEP COOLANT FROM CIRCULATING THROUGH ENGINE AND RADIATOR. THE FANS SHOULD COME ON WHEN VECHICLE SETTING AT A LONG IDLE.THE COOLANT TEMPERATURE SENSOR GET TO CERTAIN TEMPERATURE WHICH WILL COMPLETE CIRCUIT PCM SEND POWER TO COOLANT SENSOR THEN TO COOLANT FANS RELAYS AND FANS.IF VECHICLE OVER HEATING WHILE MOVING THERMOSTAT FAULTY.IF YOU TURN AC AND COOLANT FANS DONT RUN CHECK COOLANT FANS FUSE AND RELAY.IF COOLING FANS DONT TURN ON WITH AIR CONDITIONER ON EITHER COOLANT TEMPERATURE SENSOR FAULTY OR PCM FAULTY.IF ALL LOOKS GOOD.IF ENGINE OIL LOOKS LIKE MILK SHAKE.YOU HAVE BLOWN HEAD GASKET.

Nov 11, 2010 | 1999 Oldsmobile Alero

1 Answer

Coolant fans won't come on. Changed coolant sensor and checked all relays and fuses all are good. Think that the pcm is not giving the command for the fans to come on how do I fix.


scan car to see witch problem code it is, any auto parts store will scan for free. check for 12 volts at coolant fans connection. if your getting voltage then the fans may be bad.

May 12, 2010 | 2001 Chevrolet Malibu

5 Answers

What would cause my radiator fans not to run


A lot of different things fall into this senario.Low coolant level,air in the cooling system,and a stuck thermostat,or,a bad coolant sensor,or even a bad cooling fan relay,or the cooling fans are bad.Turn the defrost on or the ac,the cooling fans should come on if the fans,and the relay are ok,if so,replace the thermostat,and coolant sensor,and bleed the cooling system of air.

Feb 01, 2010 | 1994 Toyota Camry

1 Answer

How do u change fan relays on a 92 seville 4.9l.


the fan relays are in with the other relays in the relay box,check the coolant sensor,or just replace it.If you turn on the ac,will the fans come on?If so,the relays are fine.be sure the coolant level is fine,and there is no air in the cooling system.This,along with the coolant sensor are the main causes for this problem.Is the cooling fan fuse good? I hope this will help you.

Oct 06, 2009 | 1988 Cadillac Sedan DeVille

1 Answer

Ac on max fan switch on high and neither coolant fans come on


Check relays (usually un.derhood) first See owner manual for location. Then check engine coolant temperature sensor. If it's not providing high temp signal, the fans won't come on. However, the fan usually comes on when a/c is engaged. Leaing towards relays

Mar 01, 2009 | 1998 Chevrolet Lumina

2 Answers

Fan won't come on


RADIATOR FAN WORKS OFF OF THE COOLANT SENSOR NOT THE IAT SENSOR. CHECK YOUR RELAYS AND ALSO SEE IF IT COMES ON WITH THE A/C AS THIS OVERIDES THE COOLANT SENSOR FOR THE FAN. MOST LIKELY CAUSE WOULD BE A FAN RELAY

Aug 25, 2008 | 2001 Jeep Grand Cherokee

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