A couple quick question for the group.

1. What signals turn on the auxiliary fan. Is it just the temp sensor? or does it go on with air conditioner on?

2. Where is the fuse and or relay located. Under the hood or in the car?

Thanks

Guys

 

Just type fan or aux fan in the search box and there will be loads of threads that you can browse through.

 

The fan comes on only from a signal send by a sender in the radiator. The temperature is ridiculously high and the fan never comes in unless you modify it to come on with the a/c or with a toggle switch in the cabin so you can turn it on at will

The relay in on the U.S. drivers side in the engine bay IIRC it's the first relay in the row

 

Thanks for the responses.

I noticed the temp on the gauge go up in city driving here in Florida. It gets pretty warm in stop and go traffice.

When I got home I checked the fan and could not get the blade to turn. Already ordered a universal type and will take it apart to see if I can fit it in the original housing.

Looked at the wiring diagram and may possibly try the connection to that when the AC goes on so does the fan.

Softball60 Paul

1996 XJS 2+2 convertible
1957 XK 140 Drophead Coupe
Every other British sports Car known to Mankind

 

You said that you tried turning the fan, was that by hand or electrically?
Have you tried disconnecting the fan supply and powering it off another 12V supply directly? It may not be the fan at fault but the power supply.

 

Steve,

Thanks for the input. When I checked the rotation of the fan blade I found it extremely difficult to turn....almost bound!!

With a pair of pliers grabbing on to the shaft I could turn.

These things should be almost free wheeling......???

Anyway bought another and just waiting for delivery. I'm thinking of installing a hidden switch to turn on and off as required.

Thanks

Paul

 

Paul,

If you've got temp fluctuating in stop / go traffic, my guess would be that you've got the typical XJS cooling vanes corrosion in the lower 1/3rd of your rad.

Carefully lift the rubber flaps at the bottom and examine that section of the rad. I bet that all the road debris has corroded and blown out lots of the vanes. It happens on all late XJSs eventually. When this happens, the temp rises in traffic and then drops as you get increased airflow as you drive.

A new rad core and you'll sit happy in traffic.

Good luck

Paul

 

Paul,

You may be correct but the issue is that the aux fan never came on. Maybe I paniced when I saw the temp creeping up on the gauge. I now know that the fan probably should have come on based on where the gauge was indicating.

As I mentioned in my previous thread, I could not turn the aux fan motor without the use of plier and force.

My guess is that the fan motor never came on when it should have.

When I drive normal in Florida (Been extremely Hot!!!) with the windows down or the top down ....No Air On..... My gauge runs normal.

Thanks

Paul

 

https://www.jaguarforums.com/forum/x...ary-fan-52343/

I made some notes (below from various posts in the thread when I had a similar problem.

"In the engine bay there's a fuse box and relay panel on the left side (there's one on
the right, too, but we want the left side)
Check the #4 fuse in the fuse panel. If blown, replace it. Should be 30amp
If the fuse is OK find the temp switch in the water pump housing. Remove the wires
and touch them together. If the fan now operates the switch is no good.
If the fan doesn't operate.......
Find the cooling fan relay near the left fuse box. It'll have brown/green, black/green,
and green/brown wires. Unplug the relay. With the relay unplugged you'll see the
wiring terminals in the plastic relay socket. Using a small jumper wire you want to
jump the black/green wire to either of the brown/green wires. If the fan now
operates you have a bad relay. If it doesn't operate then the fan motor is faulty, or
the wiring between the relay and the fan is faulty, or the ground is faulty."

 

Paul,

I think from your sig that you have a 4 litre. In which case the thermoswitch is in the left side upper part of the rad tank, not the water pump housing as per the v12.

Paul