cooling fan not working

[petey882]

just as the title says fan is not working when it gets up to temperature and when i cut the key off the sub cooling fan comes on but the other one never comes on at all anybody have any idea i have checked all the fuses and swapped the relay and still nothing

[conozo]

have your shorted the contacts on the plug that goes into the thermosensor to verify they fans are getting power and the relay works.

[petey882]

no how do i do that which plug is it

[petey882]

ok i shorted the plug and the fans came on so i went and got a new thermosenser switch and its still doing the same thing

[jasonrebellion]

then the problem lies in your wiring if the sensor didn't fix it.. are you sure you replaced the right sensor? There are 2 right next to each other that look pretty much identical

[LX-incredible]

The fan switch is on the bottom of the radiator. Are you overheating? Do the fans come on with AC?

A faulty thermostat or air in the system will cause the sub cooling fan to come on as you describe. Change your thermostat and bleed the coolant.

[petey882]

yes i changed the one on the bottom of the radiator and it is still doing the same thing could it be one of the other ones near the thermostat it runs hot after idling for about 15-20 minutes bc the fan never comes on until you turn the car off then the sub cooling fan comes on but not the big that is supposed to come on

[petey882]

and as soon as you turn the key switch back on the sub cooling fan goes off

[Bluntman]

Also in the mainfuse box there is

Cooling fan relay

sub cooling relay

cooling fan fuse

sub cooling fan fuse

cooling fan timer fuse

Check all maybe you missed something there. Fan timer fuse maybe

[petey882]

if the relay was bad the fan wouldnt come on when i jump the sensor plug would it??

[Bluntman]

Go look at the fan timer fuse, just out of curiosity, you can also switch the two relays around and see if that fan comes on when it heats up.I believe they take the same relays.

[petey882]

i have checked all the fuses and i switched the relays around as i have already said in the post the window relay and fan relay are the same

[ryan2107]

yeah i got a similiar problem, my car would get too hott but only one fans works which is the left side, the right side is the ac fan which doesnt work and really dont need it,unless you want ac, but i just replaced the cap, and now no more heating :-)

[LX-incredible]

The aux/sub fan switch is located on the thermostat housing, before the thermostat. It is the larger of the sensors, and has a green connector. If the thermostat isn't properly opening, there isn't going to be a high enough flow of coolant to flow through the top of the radiator and be hot when it gets to the bottom, where the main fan switch is located... Since the aux fan switch is before the thermostat and isn't dependent on flow, it will signal the timer to run the aux fan.

Change the thermostat and bleed the cooling system. Use the honda part, it makes a difference.

[petey882]

i bled it already but i will try again see if more air is in there in just a bit

[petey882]

the thermostat was stuck thanks for the help im having other problems now please check out my other thread not revving up fully