Cooling fan stays on

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Feb 17, 2007 | 12:46 AM

#11

JimBlake

Super Moderator

Joined: May 2006

Posts: 18,398

From: Wisconsin

RE: Cooling fan stays on

Some years there's 2 fan switches in addition to the sensor for the ECU & the sender for the dashboard gauge. That's 4...

Feb 17, 2007 | 10:11 PM

#12

hondadude

Super Moderator

Joined: Aug 2006

Posts: 2,170

From: Fayetteville, AR

RE: Cooling fan stays on

When you catch it in the act of "fan running", just unplug the temp sensor; If the fan stops you have found the problem; this ain't rocket science [sm=trust_me.gif]

Feb 17, 2007 | 10:56 PM

#13

shermanreed

Unregistered

Posts: n/a

RE: Cooling fan stays on

OK, I pulled the plug on the sensor (at the t-stat housing) and the fan did not go off. I then removed the fuse box cover, under the hood, and removed the fan relay fuse/switch. When I did this, the fan shut off. I then replaced that fuse with theother one right next to it and the fan did not come back on. I then returned the original fuse back into its place and the fan still did not come back on. Now I am confused. What do you all think? Is the fan relay switch bad and just needs to be replaced.

Normally, after each time I drive the car I have to disconnect one of the battery cables to keep the fan from draining my battery. After performing this test, I simply left the cable on the battery as the fan was not running - I will check it again in a little while.

Feb 18, 2007 | 10:10 PM

#14

TexasHonda

Super Moderator : And A Texan

Joined: Feb 2007

Posts: 9,652

From: Katy, TX

RE: Cooling fan stays on

Quote:

ORIGINAL: shermanreed

OK, I pulled the plug on the sensor (at the t-stat housing) and the fan did not go off. I then removed the fuse box cover, under the hood, and removed the fan relay fuse/switch. When I did this, the fan shut off. I then replaced that fuse with theother one right next to it and the fan did not come back on. I then returned the original fuse back into its place and the fan still did not come back on. Now I am confused. What do you all think? Is the fan relay switch bad and just needs to be replaced.

Normally, after each time I drive the car I have to disconnect one of the battery cables to keep the fan from draining my battery. After performing this test, I simply left the cable on the battery as the fan was not running - I will check it again in a little while.

If you pulled the connector on the thermoswitch at the thermostat housing behind the distributor, you pulled the wrong connector (Thermoswitch A connector). Thermoswitch B which controls the engine-off fan cooling is on the upper radiator hose fitting on the engine side.

A manual is a great tool to assist resolving problems like yours.

good luck

Feb 19, 2007 | 01:37 AM

#15

deserthonda

Been Around A Long Time Member

Joined: Dec 2005

Posts: 4,754

From: In The Desert ( Sahara ? )

RE: Cooling fan stays on

have you checked the coolant level ?? if low fan will come on ..also if low, pressure test the cooling system
has engine ever overheated on you ? also Texas is correct on which sensor connector to unplug

Mar 7, 2007 | 02:44 PM

#16

muibu

Unregistered

Posts: n/a

RE: Cooling fan stays on

Thanks for letting me bandwagon on this thread and I got my problem fixed.....

While fan was still running after engine off, I unplugged the thermoswitch B (at the upper radiator hose fitting) and the fan stopped...as advised by hondadude. So I ordereda new oneand this seems to have solved the problem.

Thanks.

Mar 7, 2007 | 03:02 PM

#17

JimBlake

Super Moderator

Joined: May 2006

Posts: 18,398

From: Wisconsin

RE: Cooling fan stays on

It's nice to know whether our advice was good or bad...

I read your post & thought I'd explain more:

When the engine is running, fan switch A is responsible for switching the fan on & off.

After you turn theengine off, fan switch B is responsible for switching the fan, but these switches operate through the fan timer module. The job of this timer module is to turn OFF the fan after xxx minutes, even if fan switch B is stuck. Since you could plug yourfan fuseback in after 15 minutes, and the fan didn't run, your timer module seems to be OK.