Hi All.
Just got done with the head gaskets on my 01. Everything is running smooth and nice. But I have noticed a coolant leak. The location is passenger side ( right side,) rear of engine close to the bulkhead. I'm suspecting the lines from the heater core? Where they come through to the engine bay. Not the upper ones. Leak seems to be close to the transmission bell housing. It drips directly onto the front short driveshaft. Any ideas on this? Common failure points etc? Also I did have the heads machined and new stretch bolts were used. Followed all torque procedures.
Quite frustrated as you can imagine.
Cheers John

 

Follow up. I checked again. It's leaking from the intake manifold somewhere and pooling there its then running down the passenger side.I replaced o rings etc where would you suspect? I checked hose fittings but everything seems to be good. Any advice would be awesome.Its pooling behind the alternator .Thankfully looks like head gaskets are fine. I checked with a mirror.

 

Not necessarily your problem, but my P38 had a similar leak (LH side) which was a rear intake manifold bolt that had not been tightened when the HG's had been replaced (by a LR shop for a previous owner)

 

The throttle body heater and mess of hoses for it are known leak points; search the forum for Throttle Body Heater bypass.

 

TB heater is possible. Could be intake manifold bolts, could be intake manifold gasket, could be heater core pipe o-ring. Get the pressure test kit at advance, pressurize the system with the engine off, look for the leak. You may have to take off the upper intake to see it.

 

The heater core line that feeds into the lower half of the intake manifold (black metal tube held in with 10mm head bolt)and the small hose behind the AC compressor could be the culprit. The metal tube takes an o ring that is easy to forget or damage on install.

You should be able to get a visual with light on them.

 

Thanks guys for all the suggestions. I took a look straight down behind the alternator. It's pooling on and around that lower intake bolt head. I blew it clear with an air line, ran the car and within a few minutes it pooled again. At the same time keeping an eagle eye on the temp. I have one of those digital screens that plug into the obd port. Apparently the stock temp gauge can't be trusted.
My plan is to remove the alternator and upper manifold then manually pressurize the system to confirm before going any further. Hopefully it'll be obvious exactly where it's coming from. I didn't mention before but I already replaced the throttle body heater plate and gasket and changed the hose behind the AC unit.
I feel it's most likely the lower manifold to valley gasket at the front.
I'll let you know how it goes. Appreciate the input.
Going to take a brief break from it, I'm sure you understand
Cheers John

 

I think I found the source of the leak. The person suggesting the coolant pipe behind the alternator. You were correct. It had a tiny trickle that sat on front head bolt. Then went down the back near the transmission housing. I did have the o ring in place. Fresh from Atlantic British in the kit. It's been a few weeks now and I can't remember, but is it just one o ring or two? See picture. I ask because the front of the hole has a chamfer. As you can see I have just one.
Cheers everyone. John.

 

It's just one o ring. I always put a little permatex aviation sealer on o rings and hoses that are hard to access and i think might be a pita to go back into if they give me issues.

 

You were right!! Thank you. I did have a new o ring installed. It's been a few weeks but did it have two or just one? The hole looks chamfered. Also the attachment area has a slight step, I'm thinking it has another o ring at the shoulder of the mount plate. Or they sent the wrong I ring.
Cheers John