A/c Fan! Help

[lovelylexus400]

Hi, I believe I asked this question before..but still cann't find the solution for my problem yet...is there a way that I can turn the a/c fan off temperary? when I start the car..the a/c fan will (big single fan in front of the engine..not the two small one for the radiator) turn on and stay running the whole time until the engine turn off..it make alot of fan noise and comsume alot of gas..how do I fix this problem? is there a failure part somewhere to trigger this a/c fan to be on the whole time? any advise? please help..thanks

[wwest]

Hi, I believe I asked this question before..but still cann't find the solution for my problem yet...is there a way that I can turn the a/c fan off temperary? when I start the car..the a/c fan will (big single fan in front of the engine..not the two small one for the radiator) turn on and stay running the whole time until the engine turn off..it make alot of fan noise and comsume alot of gas..how do I fix this problem? is there a failure part somewhere to trigger this a/c fan to be on the whole time? any advise? please help..thanks

In the center of the engine driven "fan" is a viscous clutch that "stiffens" the coupling to the engine as the heat coming through the radiator rises.

When you start the engine cold the fan should simply freewheel, turn but not forcefully.

The viscous clutch has likely failed.

[lovelylexus400]

any advise for replacing the viscous clutch? thanks

[eatingupblacktop]

any advise for replacing the viscous clutch? thanks

any advise for replacing the viscous clutch? thanks

Here's an excerpt from a posting by 92Lex for replacing a timing belt:

Remove air duct - (1) 10mm bolt :

Remove fan clutch:

http://i140.photobucket.com/albums/r15/gsxr37/103_0330.jpg

Remove fan clutch by loosening these 4 bolts behind it:

http://i140.photobucket.com/albums/r15/gsxr37/103_0329.jpg

The entire posting is at:

http://us.lexusownersclub.com/forums/index...=14705&st=0

Here is a link for the option of replacing your mechanical fan with an electric one:

http://www.lexls.com/tutorials/cooling/fanconversion.html

[wwest]

any advise for replacing the viscous clutch? thanks

any advise for replacing the viscous clutch? thanks

Here's an excerpt from a posting by 92Lex for replacing a timing belt:

Remove air duct - (1) 10mm bolt :

Remove fan clutch:

http://i140.photobucket.com/albums/r15/gsxr37/103_0330.jpg

Remove fan clutch by loosening these 4 bolts behind it:

http://i140.photobucket.com/albums/r15/gsxr37/103_0329.jpg

The entire posting is at:

http://us.lexusownersclub.com/forums/index...=14705&st=0

Here is a link for the option of replacing your mechanical fan with an electric one:

http://www.lexls.com/tutorials/cooling/fanconversion.html

Oops...

Looks as if the LS uses a thermostatic spring for fan clutch control not a VC.