S-Type cooling fan runs at max revs

[mrmike]

2005 S-Type cooling fan runs at max revs and continues after switch off even with cold engine.

Before you condemn the controller / Motor check the connector oxidisation especially the ones connecting the White/Blue wires (Control PWM system)

Personal experience.

Good luck

Mike

[JOE-DOT-COM]

hi

the heater fan is controlled by the climate module

if you turn the fan speed down and its not controlling, only thing it can be really is the climate module

have you open the climate module up, they renown for blowing tracks on the board and usualy fix well

only other way is to get it pluged in and see what software says and you can operate everthing manually

cheers

Joe

[The Voices]

Think he means the engine cooling fans ?

[JOE-DOT-COM]

hi

if your on about engine cooling fans

its controlled via a cooling fan module

also most stuff on the s-type has a permanent feed to them and then the earth is switch via the module, so if there a fault on that wire it will run all the time, because of the permanent feed

check the wiring to the fan for damage, connectors for corrosion or trapped wire to earth, may be the module aswell

if you need any manuals or wiring diagrams there all here http://www.jagrepair.com/

cheers

Joe

[mrmike]

On 6/8/2021 at 12:08 AM, The Voices said:

Think he means the engine cooling fans ?

Thats right! (Fan)

[mrmike]

1 hour ago, mrmike said:

Thats right! (Engine Cooling Fan) This is for the S-Type from 2004 I think, single fan. The control is from the ECM and is a PWM signal active high at the controller. The duration of Negative going pulses controls the speed between 5% and 95%. If the White/blue wire to the controller is interupted for any reason, the input at the controller goes high and the motor revs are maxed and run on for 5 seconds or so after ignition off. (BTW the fan turns on with the ignition with this condition even with cold engine and no A/C).