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Discussion Starter #1
Original thread located here- http://www.lotustalk.com/forums/f101/cooling-ticking-timebomb-how-your-cooling-u-tube-47232/



So I’ve been pretty quite as of late and don’t think I’ve seen this cooling issue addressed before. This last Friday I discovered a small cooling leak originating from the front side of the engine of my Cartoon Car. So I took the undertray off and slid under to take a look at what might be the problem. What I saw made me realize that yes, this is a Lotus alright. The coolant leak is coming from the A120E0017F Connector, which shorts a vestigial cooling run to the oil filter heat exchanger we don’t have since we have front mounted oil cooler/s. So basically these cooling lines are dangling down with a U-shaped Al tube in front of the engine. Well, the hose length on my car is just right so that the Al tube (P/N A12E0017F) rest and rubs on one of the oil line fittings. Hence, it rubbed long enough to create a pin hole leak. It’s a 0.080” relatively thick wall tube with ~0.58 OD, so it took it’s time to rub thru.

I think all the Fed Elise/Exiges have one or two front mounted oil coolers, so you might want to check to see if your U-tube is rubbing. If it is, it’s a ticking time bomb in your coolant system. Take a look at the pic from the Service Parts List (Item 20). If you are under the car, looking up, that hose assy and U-tube are basically right above the oil filter assy.

The other thing that sucks is I’ve got take the car to the dealer for them to cover the part under warranty. While I understand they need to dot all their “I’s” and cross all their “T’s”, so they can look at it and determine the same conclusion. Flat-bedding my car to the dealer ship at my expense sure seems like I’m getting shafted for a obvious poor hose routing and support from the factory:wallbang:. I mentioned I can bring you the failed part and pix of what everything looks like, but they need the car regardless. I know another local Elise owner I hold in high regard has noted the same rubbing issue, it’s bound to be a problem on other cars out there. Anybody know if there is a service bulletin floating around for this?

I’ve got the local parts department checking on the cost of the U-tube part, it wasn’t in their system, since it’s never been ordered. If it relatively cheap, I can replace it myself. I’ve repositioned the hose assy higher, so it won't rub like the original position. Now you can access the U-tube from the topside of the engine bay, still tight confines thou.

Well, as these cars continue to age, these kinds of interesting failures and oversights will continue to reveal themselves. If I get a chance tonight, I will post up a few pix of the area of interest and the removed U-Tube.

Hope this helps my fellow ETer’s.

-Frankie-
 

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I've already supplemented a brass 90º barb-barb fitting that should get me to the dealer if need be. If the part is relatively cheap (which in a sense makes this even more asinine), it's just not worth my time and effort to go all the way to the dealer BS paper mill. I bet if I took it to the dealer, they'll bleed the cooling system as well as they did when they replaced my rear brake caliper-eek-...

Yep, that U-tube is Al, and I might take it to work and get a buddy in the Aero lab to weld it up (hopefully it's 6061). Heck maybe I'll find a scrap piece of comparable Al tubing and fab one up. Once I hear back from the parts dept, I figure out what I feel like doing. There a few other things I want the dealer to resolve, this might just be the time to do it.

Here are a few pics of the culprit. I was fortunate that I found this in my garage. If anything, next time you change your oil, take a look at this hose assy.
 

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And while we're on the topic of preventative maintenance for hoses, check all the stainless braided flex hoses you can access and make SURE there is NO contact between the braided covering and anything else. Since the braided cover is made up of fine S/S wire, it is easier than you think to abrade through the covering by just rubbing a little on a nearby surface. I've seen an oil cooler hose on a bike rub through to the inner hose in less than three months due to one flex hose rubbing on one beside it. If there is any contact with the braided flex hose, it's a good idea to isolate the contact area by overwrapping it with some of the poly spiral tubing (Pep Boys, etc.), or whatever works for you.
Jim
 

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My Cartoon Car (VIN 31386) is a dual front oil cooler car and I'd suspect any Fed Elise/Exige with front oil cooler(s) could potentially have rubbing issues with this hose assy.

Like Nathan said, you should be able to see this area by taking the RHS rear wheel off and looking towards the forward side of the engine. If your tube isn't in that spot, I'd be curious to see where the routing is, if its a different hose assy, just to make sure it's not rubbing on something else:shrug:.

I've attached a pix from the Service Parts List where I've highlighted the hose assy run, for a NON-front oil cooler(s) car. Imagine the U-tube shorting the run instead of tying to the oil filter heat L-to-L exchange shown in pic. This is what my car looks like.
 

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Discussion Starter #5
Theres also no way to check it with just the rear tires off, you must remove the under tray.
You are right, my under try was off when I too some pic's from the RHS rear fender well. Here's a pic from that angle with the car running, even with all that rubbing ont he tube, it was just barely dripping. The blurry thing to the left is my phat BADARAONE.

Man, and I was all ready to have some good fun at MSR CW this past Saturday. Thanks:clap: Toad for letting me get a few fun laps in your Elise:coolnana::up:...
 

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Interesting...

I checked mine as well and the u-tube was zip tied down to one of the oil cooler lines :shrug: . Not sure if this was done by a dealer or the PO. I don't see any "bad" abrasion, and I'll try to post a pic to show all later. The last pic is my attempt to tie the u-tube to the larger cooling line? I'll haver to check it at the next oil change. Thought others might be interested in seeing another...

Jim B.
 

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CHECK YOUR "U-TUBE" SOON

This is not just a high-mileage problem.

I just checked my connector for the feed and return hoses and there is wear at 6000 miles. Granted, I do a bit of spirited driving on twisty mountain roads but nothing excessive.

Here is my connector on my 2007 Elise, again at 6000 miles:
View attachment 74653

Here is what I used to shield the connector for now, zip-tied around the tube. It is a rubber shim for bicycle handlebar attachments (lights, heart rate monitors, etc). I figure the rubber will help hold the connector in place, buffer any movement, and protect the connector. Really it is the only thing I had lying around ;):
View attachment 74654

Here it is in place:
View attachment 74655

And again:
View attachment 74656

Don't let this slide too long or you'll be sorry :no:. Check your feed and return hose connector soon.
 

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