Have just bought a 1994 S280 and noticed the front fans not working when i switch on the A/C even thought it does blow very cold air out of the vents when switched on, when should these kick in and is there a test to check them, when i had a 1998 E300 diesel the fans came on as soon as the A/C was switched on, have looked around the threads but cannot find anything on the S 280. Any help would be great, cheers Derek