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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old March 22nd, 2011, 18:42   #1
Pcar993
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Default Has anyone used radiator leak stop to stop a heater core leak???

good idea? bad idea? Has anyone used radiator leak stop to stop a heater core leak??? Looks like a pain in the ass to replace it.
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Old March 22nd, 2011, 18:45   #2
Seatman
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Wynns stop leak's pretty amazing at stopping leaks but you'll have to check it's compatibility with the vag coolant.
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Old March 22nd, 2011, 18:58   #3
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Do you just have a pinhole leak causing window fogging or is it actually leaking fluid?

I was about to get my heater core replaced on my Passat last November but then it self sealed. I never acutaully had a liquid leak though just some fogging/film on the windows. I spoke to MrChill about this and he said it fairly common and his Jetta did the same thing.
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Old March 22nd, 2011, 19:32   #4
Pcar993
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Quote:
Originally Posted by johnboy00 View Post
Do you just have a pinhole leak causing window fogging or is it actually leaking fluid?

I was about to get my heater core replaced on my Passat last November but then it self sealed. I never acutaully had a liquid leak though just some fogging/film on the windows. I spoke to MrChill about this and he said it fairly common and his Jetta did the same thing.
I havent found any signs of leak yet. This just started happening last week. All it does right now is windows fogging and i can smell it when i turn the heater on.
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Old October 29th, 2012, 17:57   #5
LearDriver
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Mine is doing the same thing no sign of a leak but fogging with the heater on. I will try the stop leak.
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Old October 29th, 2012, 18:30   #6
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Do not use stop leak in a engine u care about replace or repare the part
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Old October 29th, 2012, 18:33   #7
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I'm at almost 2 years on my self sealed leak.
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Old October 29th, 2012, 18:34   #8
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smell = core... It took me 2 days to do out 99 Golf.

Read and re read the how tos. Go slow you ca do it.
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Old October 29th, 2012, 20:11   #9
Got Bearings?
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Bypass the heater core. It's still warm out!
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Old October 29th, 2012, 20:15   #10
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Quote:
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Do not use stop leak in a engine u care about replace or repare the part
X2 on this... or loop it out of the system till you can get enough ganas to have it done right.
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Old October 29th, 2012, 20:24   #11
aja8888
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Quote:
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Bypass the heater core. It's still warm out!
Mine is bypassed, but it was 40 F here this morning. I am still packing enough pounds to handle south Texas winter. But I do have a new core sitting in the garage.....maybe when I retire or my kids quit bugging me with their problems will I tackle this nasty job.
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Old October 30th, 2012, 18:12   #12
geostar
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I bypassed mine for a while until the frost hit. Couldn't stomach the use of leak stop so I bit the bullet and dug into the replacement. The photo below is about half way through the core extraction. I ended up removing the crossmember unnecessarily. For my HVAC box design, it is much more efficient to disconnect the AC lines and tilt up the crossmember, without fully removing it. Removing the crossmember, makes the job ridiculously complicated, as the main harness in weaved into it.

Have fun, it is not that bad. Read up and you will get it.



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Old October 30th, 2012, 19:04   #13
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Is the Bentley manual necessary to do this job, or can you just wing it?
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