No? Good.

My 4.0 (AJ6) '94 just sprung a major coolant leak. It looks like the leak is near the back of the engine, but in the dark I couldn't be certain. Any likely culprits back there that I should check out first?

 

I'm not familiar with your '94, but first thing I would check would be the hoses, not sure how your heater system is plumbed.

Good Luck

 

Agreed.

LH rear is the heater hoses, first stop in my opinion.

 

The hoses from water pump to water rail on engine block would be my main suspect.
It runs on LH side of the engine, above the oil filter and blows spectacularly. I have done it at 100 MPH in my XJ40...

Looks like this

 

thekiltedwonder,

Also check the heater valve itself at the top left rear of the engine. Known to fail, just replaced mine last month.

Paul

 

Thanks everyone. I'm going to go poke at it in a few minutes. Hopefully it's just a hose like y'all suspect.

 

Good news. It was the hose between the heater valve and the engine. It had started to crack and developed a half inch long tear.

 

thekiltedwonder,

Well done. Not too expensive. Whilst you've got that one off, I would consider also changing the one from the valve to the head.

Paul

 

That was the one I replaced. The short, straight one. I'm going to get a complete set of hoses and replace them all. This car has over 190k on in and I suspect some (most?) of the hoses are original.

 

I had a similar problem with mine, but luckily it was caught before it puked all of the coolant. Changing a hose and the main fan turned into a full-blown cooling system service. Worth it, in my opinion. The Hose Kit for the V12 from SNG was reasonably priced and comes with everything. It's worth it to replace the hoses for the peace of mind alone!

Glad your problem wasn't a major one, replacing a hose is much easier than any alternatives!

 

xjsman89, do you have a link to their kits? I can't find them on the website. I'll email them if I can't find anything before I leave work.

 

I don't know where the kits are listed on their site, all I know is that the part number for the 5.3 V12 Hose Kit is HK029, listed at $92. They're all in order (HK028, HK027, etc), but I'm not sure which one applies to the AJ6. A quick call helped me sort all my part numbers out when I was planning my order, the guys there are all really helpful.