radiator fans do not come on at anytime on xj8, fuses ok, if i connect fans directly to a battery they operate? is there a thermal switch on radiator as i cannot find one new to forum any help appreciated

 

XJ8 (what year is yours?) are powered by the Radiator Fan Control Relay Module (RFCRM)- it has 3 relays that control the fans in one of four modes:

1 off
2 Left on full
3 Both on in series (half speed)
4 Both on in parallel (full speed)

The RFCRM receives its command signals from the ECM - two wires that control the four states.

 

thanks very much

 

You're welcome.

Here's a link where it's described in a bit more detail:

https://www.jaguarforums.com/forum/s...349#post234349

The wire colors mentioned are specific to the 99 model... and Jag changes colors yearly. What year is yours?

There are two fuses - one that controls the left fan and one that contols power to the right fan thru the RFCRM - they're in the Engine Compartment fuse box, fuses #12 and #14. But since your fans don't work at all, I'd guess it's not fuse related.


Good Luck!