Question about 2002 Honda Odyssey

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99 honda odyssey coolant fans turn too late

My odyssey coolant fans only turn on at a very high temperature(close to hot) i changed the coolant fan switch sensor and the sending sensor and still fans turn on too late why is this ?

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You might need a new ECT - engine coolant temperature sensor. If it's not reading the correct coolant temperature it's not going to tell the fan to turn on when it should.

Is the check engine light illuminated? I'd bet the ECT needs replacement.

Posted on Dec 17, 2008

  • Car Fixer Dec 17, 2008

    Sorry I didn't read your post all the way through ;-) I'd still be interested to know if a trouble code has been triggered.

    If the sensor has been replaced then I would focus on the wiring & connections next. The wires may be rubbing or shorting out and causing a wacky reading. Trace the wires leading to and from the appropriate sensors. Although this specifically isn't your code, it does give you some things to consider - http://www.obd-codes.com/p0118 Good luck!


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Mar 13, 2014 | 2001 Honda Accord

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Fan sensor is not working.


You need to change the relay and the temp sensor switch. If you have done that the reason it's not coming on is probably because the coolant is not getting hot enough to cause it to come on. Let me explain. The coolant fan when the A/C is off is activated by the coolant fan switch. The switch closes when coolant temperature is over 238F completing a path to ground through the coolant fan relay windings. The relay contacts then close and voltage is applied to the coolant fan. When the coolant temperature drops to 214F, the switch opens and the coolant fan stops. In A/C equipped vehicles, the A/C control head completes a path to ground for the coolant fan relay whenever the A/C is on no matter what the temperature. Voltage is then applied to the coolant fan. Essentially, the coolant fan switch is by-passed when the A/C is on, which is why the fan works whenever you turn the A/C on. Now, if the fan does not kick in when the coolant temperature is over 238F but works when the A/C is on, the problem has to be the coolant fan switch or the connectors or wiring to the CFS.

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I have a 1999 honda civic lx its was running hot so i changed the radiator the thermestat water pump timing belt but now it will not run hot but the temp gage goes real close to H before it goes back...


iam suspecting the temperature gauge here ,something is or could be wrong with its electrical conductivity ,or the cooling fan is coming on too late which could be caused by a similar problem with the fan temperature switch

Feb 15, 2011 | 1999 Honda Civic

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Engine runs hot


Hello,
Most often that is caused by a bad thermostat.

How to test the thermostat in most vehicles;

Make sure the heater is off, start the engine and let it run for 6 to 8 minutes, ( this will allow the
engine to reach, " normal operating temperature "), from the inside of the vehicle turn the heater
temperature on high and turn the fan speed on high.
1. Listen very closely for a click sound from the engine, ( most thermostats make a click when
they open )
2. Watch your temperature guage, it should begin to lower as the coolant starts to circulate.
3. Usually within a few minutes the radiator fan will kick.

What the thermostat does;

It seperates your coolant into two parts. The first part is in your engine, the second part is in your
radiator and the coolant reservior. When the coolant in the engine reaches the temperature rating
on the thermostat the thermostat opens to allow the two parts of coolant to change places. Now
the cooled coolant in the radiator and reservior flows into the engine while the heated coolant flows
from the engine into the radiator and reservior to be air cooled by the radiator fan.

I hope this helps you.

Feb 02, 2011 | 2001 Volkswagen Beetle

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Honda 2001 civic replaced radiator, electric fan not working and overheats..why/


HOT WIRE FAN IF ITS DONT WORK COOLANT FAN FAULTY.IF COOLANT FAN RUNS WHEN HOT WIRED. COOLANT TEMPERATURE SENSOR FAULTY OR LOOK FOR BLOWED FUSE AND FAULTY COOLANT FAN RELAY.WHEN YOUR FAN WORKING AND VECHICLE STILL OVERHEAT REPLACE THERMOSTAT.

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Hello... I got problem with my honda odyssey. For the past 3 days, if i start the engine, after 5 min the temperature will goes up to HOT and engine indicator light-up. I turn-off the engine and then start...


Your English is very good.

From what you have described, which is a rapid over heating of the radiator coolant fluid and therefore a hot engine condition, it would appear that the thermostat in the engine's cooling system is faulty.

If the thermostat is sticking in the closed or nearly closed position temporarily, there will be no flow or very little coolant flow between the engine and the radiator and the engine will overheat.

You have advised that after the engine is shut off , and radiator coolant fluid has cooled, you re-start the engine and drive the car without the overheating condition occurring again and the radiator coolant temperature is normal. This time there is no overheating because the thermostat is working normally.

You should have the thermostat replaced as soon as possible because allowing the engine to overheat can cause very expensive engine damage.

If you had a continuing overheating condition then I would suspect both the thermostat and the water pump. However as the overheating seems to be only temporary, and clears itself after you have shut down the engine and re-started it 10 minutes later (without further overheating arising) then I think you only have a faulty thermostat.

Please also check that the electric fans which draw air through the radiator are operating. These run on a temperature sensor and will switch on automatically once the radiator coolant fluid reaches a certain temperature and then switch off again when the fluid temperature reduces. You will hear them running once they start up. If these fans are not working the radiator coolant can quickly overheat in various driving and temperature conditions because there will be insufficient air flow through the radiator to cool the fluid. If the temperature sensor is faulty or has died, or if the electric motors running the fans are faulty, the fans will not operate.

I hope this helps.

Dec 18, 2010 | Honda Odyssey Cars & Trucks

1 Answer

2001 town&country had replaced radiator but now fan stop working van is not over heating and heat is good hanve no other problem just fan s not working olease help me to find out waht could be problem


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Engine fan will not turn off


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