We've been having record heat the past few weeks (e.g. almost 100) here in N TX, and I've anxiously watched the temp. gauge on my '94 4.0 coupe slowly inch up in the afternoons to mid way between the mid-mark and the beginning of the red zone. I've wondered if this is an acceptable reading for a 4.0 and other owners have told me it is NOT. and that I"m kinda playing with fire here. It finally dawned on me why the reading was not coming down like it should, esp. after "heat sink", and then I realized that I have never heard the auxiliary cooling fan running in this Jag. I checked the fuse, and the PO had for some reason inserted a 20 amp instead of the designated 10 amp in the slot. Worse, when I checked the fuse, it was blown. I replaced the blown fuse with a 10 amp, and went for a drive. Upon returning and re-checking, that fuse too had blown.

Deciding to investigate the problem some more, I tried jumping the fan relay and, instead of the fan coming on, the fuse promptly blew. Reaching around blindly from the front of the radiator, I felt for the auxiliary fan (dang awkward place to put it!) and discovered it was pretty much stuck in place. However, a firm tug with my hand and it was free and spinning again like it should. However, a check with a hand mirror and flashlight revealed the motor housing end had a good deal of rust on it. Being originally a MA car, I'm thinking the engine rarely got hot enough for the aux. fan to activate. Anyway, I crossed my fingers, put in a fresh fuse, and jumped the relay again. Bang went THAT fuse. Ugh!

Any idea what's going on? What should I check next? I'd try to put 12 volts directly to the motor to see if it even runs, but it's in such an inaccessible place. I do hope I don't have to r/r the motor, not only due to the effort apparently required (e.g. remove radiator? remove hood?) but the cost - I have only seen one good aux. fan motor for sale on Ebay of late. It's NOS and the vendor is asking almost $400 for it!

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Replace the OEM fan with a good aftermarket one.

 

I'm sure you've already searched the forums, and found this:
https://forums.jag-lovers.com/t/auxi...toast/355864/6

Once you remove the hood, it should be very easy to access and fix.

You might be able to restore it! I thought my fan was dead and once I took it off, I found that it worked just fine. (I can't recall what was causing the grinding noise I heard, but I wasn't losing fuses like you)

I was able to take some info on it, in case you find it useful:

- The mount holes for the fan motor is 3-3/16".

- Also, OEM fan is made by FASCO; part number 2819-420-042

- Theres also another number; W961849U and then a floating “38S”, for some reason as well as an arrow pointing left.

I don't think I was able to find a suitable replacement, quickly, but because my fan worked, I don't think I spent enough time searching.

I would not bother with a $400 fan. You can get something brand new for a fraction of that! It might take a little bit of time and effort, but no way am I paying that much money for a fan.

 

Mine was blowing fuses too, it was stuck. A few turns by hand to free it and its worked well since.

 

There are 2 reasons a motor (fan in your case) will blow a fuse.


1 If the motor is stuck and does not rotate it will draw a huge amount of current as the motor winding looks like a short circuit until the motor rotates generating a back voltage limiting the current. This could be fixed by repairing the motor, bearings usually.



2 A shorted winding in the motor, only fix for this is to replace/rewind the motor.