Fan fail light

Cathy · Post by **Cathy** » Wed Jan 25, 2006 21:42

My fan fail light is staying on all the time, both fans cut in at the right time and the header tank is filled up to the top and it is not losing coolant, i have no problem with it over heating. Could it be a dodgy connection?

amarshall · Post by **amarshall** » Wed Jan 25, 2006 23:28

Check the light delay module - it could be full of water......

Dougie · Post by **Dougie** » Wed Jan 25, 2006 23:52

Is the light delay module under the steering column? I lost all indicators at the weekend and found the relay was full of water! A quick wipe out with kitchen roll and a scrape of the bi-metalic strip, all sealed up with Duck Tape rectified the problem. I think the water may be coming in through the gromit around the windscreen wiper.

amarshall · Post by **amarshall** » Wed Jan 25, 2006 23:57

Yup - tis indeed - there are two big modules under there -the Yellow one is the courtesy light delay and the Orange one should be the fan warning light delay.

While you're in there, check the relays for starter motor, rad. fans and heater fans - they're on the bottom of the slope in the outermost (i.e. wing side) row.

Earlier cars had the relays in different places.....

Cathy · Post by **Cathy** » Thu Jan 26, 2006 00:12

This cannot be due to water getting in as my car is now water tight after an all nighter riping out the interior to trace a water leak which turned out to be a leak through the wiper grommet. live and learn. What else can be causing it to stay on?

amarshall · Post by **amarshall** » Thu Jan 26, 2006 00:16

Cathy - if you didn't empty all the relays, it could still be water causing corrosion.....

Cathy · Post by **Cathy** » Thu Jan 26, 2006 00:26

Hum....will get on it tomorrow. Just to double check see if your right. What about the connections on the header tank could they have broken down, as i presume the two wires coming off of it are the low coolant sensor.

amarshall · Post by **amarshall** » Thu Jan 26, 2006 00:31

The two wires sounds about right. For a fault like this, my suspects would be (in order) :

i) delay module
ii) rad fan relay (second from rear)
iii) sensor
iv) rad fan switch (in the top hose)
v) aliens!

i) & ii) mainly because corrosion could set in allowing the fans to come on, but causing high resistance to still trigger the warning light,

Also, I've noticed that my fan light comes on if I've done some serious driving and stopped briefly to refuel (serious = > 100 miles) because the header tank contents have gone over to the pressurised overflow tank instead.

Cathy · Post by **Cathy** » Thu Jan 26, 2006 00:41

Thanks for that, i will go through the check list but i'm tempted to think it could be aliens! I have noticed that this has been happening for a while, it wasn't coming on when the coolant level was slightly low and then i topped it up and went on a good 50 mile run and it has stayed on ever since. Gremlins!