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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  • 184 Answers

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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See? So you do need a wiring diagram to see how the circuit is wired. But the first step is to verify fan motor is good. Good luck, Nigel.

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1 Answer

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.

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