tsiriman:
Hello guys please i need help, I have a 2008 Honda Accord EX-L, for some time I've noticed that my radiator fan does not come on while my car is on even after running for a long while, but immediately i switch on the AC both the radiator and condenser grabs come on and remain on, if i switch off the AC both fans go off.
Little research I've don't on the Internet suggest that is the Engine Coolant Temperature ECT sensor thats probably bad.

Anyone here who has experienced similar problems.

ZIMDRILL:


the radiator fan only comes on when the temperature has reached between 86 -90 degrees

a simple test let the car idle untill the temperature reaches towards half mark, then you must hear the radiator fan kick in

if it doesnt then we take from there

chillex8:
Confirm that your thermostat is still in place and functioning properly..

tsiriman:


Thermostat is in place and has never been tampered with, but i don't know if it's functioning properly.

abatically:
If ur ect sensor is bad then there should be a check engine light on. If ur check engine light is on then scan the car and post the codes. The ect is located below the radiator. The first thing to do though is let the car idle until ur temperature gets above the half Mark and see if the can comes on.

Ikenna351:
tsiriman,
Start the car, leave it to idle. Let the temperature gauge needle gets to 100 C. If it exceeds 100 C and fan refuses to spin without A/C, then you can start with relay or fuse that triggers on the fan with A/C off.
I dont know about Honda, but for some of Peugeot cooling systems, the fans start spinning when temperature gets to 100 C. But on most instrument cluster, the temperature gauges would remain at 90 C when fan starts spinning, even though the true temperature has exceeded 90 to 100 C. But on few instrument cluster, it would exceed the 90 C to 100 C before the fan kicks in. This design may be similar to yours.
Ikenna

9icetoo:
Allow ur car warm up till it goes a bit over the half way mark, don't put on the Ac, just leave the car on. If the fan does not come on after the temperature has significantly crosses the half way mark (do not allow it get to the red zone), then you we can take it from there. Meanwhile, do not allow the electricians butcher it just yet.

chillex8:

Did u loose the thermostat housing and saw it there
Pls confirm
Hope no one has tampered with your cooling system wiring also..
Have you checked all the radiator fan fuses/relays
Your car's thermostat allows coolant to circulate
when the engine is warmed up and should be
closed when the engine is cold so that the car can
warm up faster.
It's a fairly inexpensive part that's
replaced easily, but when it fails, your car can
overheat, causing costly engine damage.
Instructions
1. Warm up the car but don't let it overheat--don't
let the temperature gauge go into the red.
2. Turn off the engine.
3. Open the hood.
4. Find the upper radiator hose. It's black, is made
of rubber and is about 2 inches in diameter,
with metal clamps on either end. The upper
hose goes into the top of the radiator.
5. Locate the lower radiator hose. It looks similar
to the upper hose except that it attaches to the
bottom part of the radiator.
6. Touch each hose very carefully (they can be
extremely hot). If the temperature gauge is
indicating that the engine is warmed up but one
hose is hot and the other is cold, the thermostat
is probably stuck closed, and the coolant isn't
circulating through the radiator.
7. Have the thermostat replaced if this is the case.
Google.com

chukel:
Believe me, ur cooling system is ok. What u need is patience. Start ur car, open the hood, carry a seat and sit in front of the car patiently. Be ready to seat for up to 10mins. Believe me, ur fan will spin but its kinda silent. So if u expect to hear it while in d car, no way. Just sit tight in front of the car. It will spin.

tsiriman:
Guys thanks for all the help. u
Yesterday I started the car in the morning allowed it to idle for a while till the guage reached the middle mark but the fan did not come on. After a while i just drove the car like that (was a hot afternoon). When I Came back like 2 hours later I parked the car, switched off the ac and allowed it to idle. I touched the 2 hoses of the radiator and they were both hot so i guess that ruled out that my thermostat had failed close. As i was standing by the bonnet for a while the fan just came on, worked for some seconds then when off, after a while the fan came on again. It turns out that my fan was actual working, I just needed more patience.
I guess I've learnt some things too. I'll buy a thermostat and keep for when the need arises.
Thanks for all the help guys, I appreciate.

sultaan:



You don't have to buy a thermostat they don't go bad that easily just enjoy your car.

Some owners would have taken it to a mechanic first and then problem begins; by asking question first not you know how the system work to keep the temp stable compare how long a fan will last if it is only running for 30 secs every 3 minutes to keep system cool to our mechanics system of wiring it to ignition and the fan stays on permanently.

tsiriman:
Guys thanks for all the help. u

Yesterday I started the car in the morning allowed it to idle for a while till the guage reached the middle mark but the fan did not come on. After a while i just drove the car like that (was a hot afternoon). When I Came back like 2 hours later I parked the car, switched off the ac and allowed it to idle. I touched the 2 hoses of the radiator and they were both hot so i guess that ruled out that my thermostat had failed close. As i was standing by the bonnet for a while the fan just came on, worked for some seconds then when off, after a while the fan came on again. It turns out that my fan was actual working, I just needed more patience.
I guess I've learnt some things too. I'll buy a thermostat and keep for when the need arises.

Thanks for all the help guys, I appreciate.

adanny01:


It will certainly not come on in the morning unless you drive. Thats because there is no load on the engine to cause it to heat beyond the set thermostat temp. The only reason the temperature even got that far to the middle is because of the thermostat.