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Old February 22nd, 2010, 10:46   #1
2000TDIJetta
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Default Coolant leak/ Frost plug?

I have a coolant leak that appears to coming from between then engine and tranny. I cant see any thing leaking from the top of the motor. My question is: Is there a frost plug on the drivers side of the engine between the tranny and engine that could be leaking?
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Old February 22nd, 2010, 10:49   #2
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Nope.

Look to the coolant flange at the end of the head, or coolant temp sensor.

I have seen the hoses off the coolant flange and EGR cooler develop leaks. Look carefully there.
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Old February 22nd, 2010, 10:58   #3
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Quote:
Originally Posted by paramedick
Nope.

Look to the coolant flange at the end of the head, or coolant temp sensor.

I have seen the hoses off the coolant flange and EGR cooler develop leaks. Look carefully there.
I looked at that flange and see nothing running on the top of the tranny or around the flange. the egr cooler is on the back side of the engine and i also didn't see anything from that area.

It is leaking from inside the bellhousing. From the bottom of the engine, it is running out of the clutch area inside of the bellhousing. I don't see anything running on the outside of the tranny.
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Last edited by 2000TDIJetta; February 22nd, 2010 at 11:57.
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Old February 23rd, 2010, 11:40   #4
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Anyone else know what could be leaking between the tranny and engine?
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Old February 23rd, 2010, 13:19   #5
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There is nothing there unless it is a defect in the block.
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Old February 23rd, 2010, 13:43   #6
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Here is a pic I found online, doesn't it look like a frost plug or something at the end of the block that would be inside the tranny?

http://www.evcl.com/vw/tdi/TdiEngineSide.JPG
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Old February 23rd, 2010, 18:09   #7
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I'm confused. Please show me. This is a pic from a ALH block in my garage.

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Old February 23rd, 2010, 18:26   #8
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Hi maybe this could help.

I just patched a leak in my hose running to the egr, it had been rubbing on the larger hose below it. It just rubbed a tiny pinhole in it. I was loosing about a cup of coolant every other day.

The hole in the hose was above the transmission. Coolant was running down the bellhousing.

I cut the hose and put a brass hose barb in it.

worth a look!

I had to use my hand, running it along the hoses after it was hot to find the leak.

HT
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Old February 24th, 2010, 08:27   #9
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Quote:
Originally Posted by paramedick
I'm confused. Please show me. This is a pic from a ALH block in my garage.
Thanks for the pic. The one i posted is what i found online. apparently the older blocks are different?

What is that small hole/plug on the to the left of the cylinder a few inches above the crank?

Thanks for your help.
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Old February 24th, 2010, 08:31   #10
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Quote:
Originally Posted by hanother
Hi maybe this could help.

I just patched a leak in my hose running to the egr, it had been rubbing on the larger hose below it. It just rubbed a tiny pinhole in it. I was loosing about a cup of coolant every other day.

The hole in the hose was above the transmission. Coolant was running down the bellhousing.

I cut the hose and put a brass hose barb in it.

worth a look!

I had to use my hand, running it along the hoses after it was hot to find the leak.

HT
Thanks, i will take a closer look at that hose. weird thing is I don't see anything running down the outside of the bell housing, it is running out of the bottom of it from inside it.

Is there some way the coolant can run into the top of the bell housing and then back out at the bottom?
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Old September 18th, 2010, 08:20   #11
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2000TDIJetta:
What did you ever find that was causing your leak? I seem to have the same leak as you and other than pulling the transmission, which I have yet to do I cannot find anthing. Like you said it is leaking from where the transmission mates to the engine. Does anyone have any suggestions?
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Old September 18th, 2010, 16:18   #12
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Quote:
Originally Posted by 2000TDIJetta View Post
Thanks for the pic. The one i posted is what i found online. apparently the older blocks are different?

Thanks for your help.
Yes pre-1999 on Jetta/Golfs had a different engine. The biggest hint is the location of the oil filter: pre-1999 metal oil filter hanging off the engine about 1/2 way to the bottom that you unscrew and replace with a new metal filter, post 1999 the oil filter is a cartridge filter located in the front center of the engine and comes out the top.
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Old December 4th, 2010, 19:00   #13
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Yep, I just discovered the same symptoms in my 2000 Jetta, about 203k miles. Took the stone guard off and was just dripping coolant right where the engine and tranny bolt up. The housing where the driver-side axle goes into the transmission is all wet (dealership did replace drive axle seal about a year ago).

It showed up a couple of weeks ago and has been bugging me ever since. Coolant is coming from somewhere, but I can't find it Top of the engine and tranny are dry. I'm losing about a cup every other day also. Clutch feels stickier, too (but this might be imagined - or something else!)

Connections at EGR cooler, oil cooler, and back behind the temp sensor are all dry. If it stays hot, it's fine. But begins to leak when cooling down (like a seal is contracting and opening up).

I did a red-neck cleaning of my intake manifold and cleaned the tubes of the EGR cooler with solvent, hot water and a wire hanger last summer and I just replaced the thermostat, and the glow plug bridge (to solve a P0380 MIL code). Other than that, it's been just filter changes and timing belts.

Was 2000TDIJetta's resolution a leaking hose above the transmission? If so, I'll just take another crack at it and check the whole length of hoses. Thanks!
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Old December 6th, 2010, 23:34   #14
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Closing the loop on this one: I finally discovered the source of this leak. The O-ring around the temp sensor/switch. Didn't find it until the engine had cooled down for an hour or two in the garage. I started hearing a faint hiss and tracked it down to the temp sensor. An hour prior, I had eliminated this as the source of leak because it was dry (when hot and the O-ring expanded). I plunked down $2.92 for a replacement O-ring at Romano's in Fayetteville, had a nice chat with another TDI guy at the counter about glow plugs and went about my merry way.

So, I'll concur that tracking these leaks down is tedious and dependent on the temperature of the engine.
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Old November 14th, 2011, 08:31   #15
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refering to the picture by Paramedick....

"What is that small hole/plug on the to the left of the cylinder a few inches above the crank?"

That is a plug to the oil galley that feeds the crank, rods and piston spray nozzles. There is one on the opposite end of the block as well.

It is easier to find leaks when you inflate the cooling system and put your ear to it while the engine is not running. When I change a water pump during the timing belt maintenance or anything that requires finding a leak I fill the system with about 15 PSI of air to see if the pressure drops. I would hate to get the timing belt all finished just to find that the oring could not seal for some reason so I test it right after the water pump is mounted.

Another leak that is hard to trace is a freeze plug which is on the cylinder head of the ALH behind the inner timing belt cover above where the TB tensioner stud screws in. Normally these don't rot out but on one car that I worked on the coolant had been mixed with another incompatable type and the reseroir had a scum that had the consistancy of scrambled eggs. The on the outside the leak was the size of a pin hole but on the inside of the freeze plug it was totally pitted.
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Last edited by JETaah; November 14th, 2011 at 09:29.
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