The cooling fans on my '97 3.2ltr come on as soon as I start the engine, and stay on for as long as the engine is running. Is this normal? If not, does anyone have any ideas as to the cause?

Any help much appreciated.

 

mine stay of for a while after i turn the car off too.
i assume it is normal.

 

When the car was originally built no fans would be on at engine startup

After Jaguar TSBs 14 - 04 and 14 - 06 accomplished one fan will be running at engine startup

Then you have the layer of original normal commands to have one or two fans

As the engine coolant temp comes up one fan will be commanded to come on and if A/C is selected one fan will come on

As the coolant temp or the A /C demand goes high both fans will come on

There is a jumper wire test to ensure proper fan operation

If you have the TSBs accomplished you will have a jumper plug on the A/C freon pressure 2 wire switch

In some cases the 2 wire pressure switch will be removed and new freon line installed with a jumper plug on the original 2 wire connector

In practice you do not need to remove and throw away the pressure switch from the freon line

What I found with mine was the Fan Control Relay Module was mounted upside down and water had gotten inside the contacts ( after cutting it apart ) keeping the fans on

The TSBs were not accomplished and I sourced a Black then later White Fan Control Relay Module from a salvage yard

The Black colored module for the X308 does not work for the White color for the X300

14-04 (jagrepair.com)

and superseded by

14-06 (jagrepair.com)

The TBSs are rooted in the fuses blowing knocking the coolant fan system out

 

Thanks you for such a detailed reply.

 

Stu,
Try switching the ignition on with the A/C selected off. That stopped them on mine, although as I like to keep the heating on "Auto", and hence A/C permanently on, I wired the connection through the A/C clutch relay, so the "on" signal from the A/C only turns the fans on when the A/C compressor is actually working. Fan control based on engine temp is unaffected.

 

What color module works with the X-300 (1995 in line 6 cylinder engine)? I always thought it was strange that the fan starts as soon as the key is turned on when the motor is cold. I replaced the module under the left front headlights thinking it was defective and still fan ran at cold start up. You are a wealth of info Parker7, thanks!

 

Thanks for that, but I never have the heating on "Auto" and don't routinely run the AC.

 

There are 2 different freon pressure switches near the firewall

a 2 wire and a 4 wire

look to see if you have the 2 wire connector installed , removed with a small square jumper plug , or the wires simply spliced together

The 4 wire connector will remain installed

Do you have a white fan control relay module installed or a black one ( they are different part #s and maybe write them down )

After confirming you have the " proper " parts setup we will do the test

This test involves a paper clip and the 3 wire connector on the aft left lower coolant temp switch on the radiator

The 3 wire coolant temp switch connector is low current so no arcing hazard

 

Reviving this thread in hopes someone can assist. My 95 XJ6 has the TSB update with the jumper wire. But my cooling fan will run in key position 1 (accessory) as well as position 2. Is there any way around this? I occasionally like to turn on the radio while waiting in the car without the engine running but with the fan always on even in accessory mode, it’s a battery drain. The thread here is all about the fan running in position 2 which makes sense.

I have just replaced the left side radiator fan switch thinking that might be the culprit but no change. And the TSB indicates this is effectively redundant.

I appreciate any advice to tracking this down.

 

Buongiorno a tutti...
Io ho il "problema" opposto nel senso che le ventole entrano in funzione entrambe SOLO al superamento della temperatura nel termostato...
Anche se apparentemente questo sembrerebbe normale, in realtà so che non è così perchè la prima ventola dovrebbe entrare in funzione all'accensione della chiave "on" anche a motore freddo e la seconda dovrebbe accendersi solo al superamento della temperatura del motore...
Devo preoccuparmi di verificare il motivo per cui la prima ventola non si accende all'avviamento? (Al riguardo ipotizzo una scarsa pressione nel circuito del gas di condizionamento....)
Oppure posso lasciare che le due ventole si accendano solo quando il motore riscalda... come del resto desidera JEFF...?
C'è un motivo serio per cui la prima ventola dovrebbe accendersi sempre anche a motore freddo...?
GRAZIE per l'esperienza che vorrete condividere...
Buona giornata sulle strade di primavera con le nostre amate Jag...

 

Federicodeluca, have you confirmed your car has the TSB update or not? The link is higher up in his thread. It explains the condition under which it should be applied, related to over heating issues. It sounds like you may have the pre-TSB configuration.

 

Yes, I have the TSB update...
My fan probably won't run because I have low pressure in the A/C compressore...

 

I'm back after computer and phone went boom boom

Let me research and get back going

 

Howdy Parker, quick update on my situation. It seems both of my fans turn on with key in accessory position. Super annoying.

 

Pully things together after off the grid for awhile

With the mod done the fans will be in slow mode with key in first detent

To know the mod has been done.......................

 

yes, the TSB has been performed.

 

The mod was done to protect the engine from coolant overheat by the fuse blowing

So better that no fans

The fans are controlled by both the engine coolant temp switch and by the freon pressure / demand as the 2 modes are independent of each other

Keep asking questions

 

Got it. I suppose I just have to live with the fans operating in key position 1/accessory mode which seems completely stupid. Fans running in key position 2/on mode makes perfect sense of course. But not both.Weird. And thank you for the reply!

 

Not perfect from expectations but the solution ( from the manufactured wiring ) protects the engine from overheat

There is no engine overheat red light which is a shortcoming that was negated

There is a coolant temp / fan test I developed as the instrument cluster temp gauge is even a different indication ( 1 wire tem bulb ) then the 2 wire temp thermistor sensor that the ECU uses for engine regulation ( open loop / closed loop )