Have been working on bolt-on solution for upgraded auxiliary cooling fan.
John,
You should look at the SPAL Fans they have very good selection. a1electric sells them in the USA.
\Dan
Thereās only ONE kind of ugly fan: one that doesnāt cool!
Picked up first peaces of mounting bracket today. You guys might recognize other parts in the picture as well as they are for xjs as well 
As you can see, my Spal fan has four bolts not three, so you may want to offer various brackets?
Iāll be offering it together with new fan
Curious, which fan? That will be an important selling point.
Fan is from Volkswagen/Audi used on very wide range of their vehicles from ~1990 to ~2000. Fan is made in Germany and really well built. There is also a version with high an low speeds.
not badā¦but I prefer our Made in America Spals
Are those A/C compressor pipe retaining clamps? How thick are they?
Yes one of those plates are for A/c compressor. They are the same thickness as original but Iām planning to stack 2 of them.
But SPALās are made in Italy, arenāt they ? 
Thatāll work, but better is one plate twice as thick. I fabbed mine from a 1/2" thick bar cut to length with a hole drilled in the middle.
I was pondering simply using a piece from a bicycle kickstand. On bicycles that donāt have a built-in place to mount a kickstand, a kickstand is secured to the chainstays with an aluminum bar over top of the chainstays with a bolt through the middle. Looked to me as though that aluminum bar would be just the ticket for this job.
Is there an issue with the stock fan? 
I thought someone (Kirby?) said earlier something about so long as the stock parts are working properly on a 5.3 there should be no cooling issues.
btw, speaking of that fan, isnāt there supposed to be rubber flaps that open and swing closed behind it (i.e. toward the engine side)? I noticed on Superblack the other day ('92 5.3) there are none, although they are present on Superblue ('94 4.0) and also were there on my old XJ40s and X-300 (albeit sometimes somewhat āpetrifiedā). 
ā¦and the radiator is removed, to clean out the front of it.
I was going to post a separate post on this, but this might be a good time to bring it up ā¦ When I first got Superblack, at first glance I thought her radiator fan was the āgoodā upgraded black version. Recently though when I went to clean up the engine compartment I discovered it to be the original yellow fan but extremely grimy on the backside with a thick layer of black greasy. sooty gunk. 
Took a lot of Krud Kutter spray and paper towels and then a second time with Simple Green + a stiff brush to get it clean and looking new again (didnāt see any cracks in it 
). Any idea why the fan would be that grimed up, and on the BACK side (i.e. facing away from the direction of air flow)? The rest of the engine compartment was relatively clean, btw.
Not behind it, below it. The area of the rad that isnāt facing either fan has the flaps.
As Kibert said, flaps are below the fan. You can see one of them in my picture above where I have new fan mounted in a fan shroud.
Yes if properly maintained stock cooling setup is just fine as is. But OEM electric fan is really lousy and doesnāt move that much air due to old-fashioned blade design and weak motor. The reason I started searching for an alternative, is because my original fan failed. By the way Jaguar also used upgraded more modern 7 blade fan for XJRS and late 6.0l XJS.
Iām sure that not only engine cooling system benefit from this upgrade but A/C system will benefit from this upgrade as well. I also upgraded my condenser to more modern parallel flow type from later 4.0l xjs but taht is covered on another thread.
