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Discussion Starter #1
Hey guys!

I have been doing research trying to figure out why my coolant system is not circulating through my radiator. I deleted my SAI system and unplugged the coolant attachment that comes out of the cylinder head to access the SAI/exhaust valve. I only drained enough out to get the job done. Now that I'm done with that. I reattached everything and filled the coolant back up. except the coolant isn't going through the radiator. I've messaged the hoses enough to get paid already! I've tried using a hand vacuum pump to pull a vacuum on the system. But nothing is working!
I know people who have this issue have bad t-stats. But mine has been working this whole time. but it's acting like it's not opening all of a sudden, or there is a mighty big air bubble that will not get out since the bottom radiator hose is cold and the engine is practically over heating!

Help! Any ideas?:confused:
 

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You probably have a air pocket in the block; the common way to eliminate this, is through the use a of a coolant vacuum filter tool. I have a UView brand; which works excellent, the use of a vacuum tool is mentioned in the factory service manual, so it is a known issue. The 1.8T is the hardest; to "burp" and that is why, I ended up getting the tool.

There are quite a few on the market these days and some, are even less than $50 now:

https://www.google.com/search?q=coolant+vacuum+fill+toolo&oq=coolant+vacuum+fill+toolo&aqs=chrome..69i57.4126j0j7&sourceid=chrome&ie=UTF-8#q=coolant+vacuum+fill+tool

Here is an example of using a vacuum fill tool: (in this case: using UView/Snapon (UV 550000)
Airlift™ Kit Cooling Tester/)

https://www.youtube.com/watch?v=ADPxM2SC6Mc

If you do not have access to this tool; people have tried a number of ways to burp the system, with varying degrees of success.

You might check out the three to videos; for common techniques:

https://www.youtube.com/results?search_query=1.8T+new+beetle+burp+cooling+system
 

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How did you; get the air out? Another thing people do; is drill a small hole in the thermostat, to allow coolant to go not the block (when the thermostat is closed).


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coolant air bubbles

I believe that if the coolant system is working correctly you don't need to burp anything the air bubbles wind up in the reservoir and then burp out on it's own. You'll know it's burping air bubbles out when the coolant level of the reservoir go's down as you drive the car for the next 2-3 days you just need to keep an eye on the level and keep adding coolant or distilled water as it go's down.
 

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Discussion Starter #6
I removed the temp sensor and let air bleed out through there. I also used a siphon to draw fluid through the re-circulation hose going to the overflow tank. I also noticed there is a hard plug with a little hole going through it inside the hose right before the overflow tank. I removed the hose and blew through both sides. I felt a little pop when blowing from the return side and noticed that air was blowing through...I assume it's a check valve of some sort that was stuck. I noticed hot air coming forth out of the cabin vents soon after this little check valve was "popped".
 

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Discussion Starter #7
I believe that if the coolant system is working correctly you don't need to burp anything the air bubbles wind up in the reservoir and then burp out on it's own. You'll know it's burping air bubbles out when the coolant level of the reservoir go's down as you drive the car for the next 2-3 days you just need to keep an eye on the level and keep adding coolant or distilled water as it go's down.

So the my 1.8t Beetle's coolant system is self bleeding? Do you know what would or is a common cause the system to not burp out? I'd like to know that I can work with my coolant system without killing the system every time.
 

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The return hose; has a "restrictor" which is made out of plastic, it is NOT a valve. If it gets clogged/restricted; it can be pretty much impossible to burp the system. I just had to replace a hose and I noted; that my return line was clogged, I used a small wire to clean it out and compressed air, to blow it out. I still used; my vacuum filler tool, to get all the air out of the system.

Good video; showing one technique:

https://www.youtube.com/watch?v=A7zLr62CgVA

Other tips I have heard of; is cracking open the heater hose at the firewall, until the coolant comes out. Read more about this and overall discussion about the VW cooling system, in VW's Tech Connect Magazine for their dealer techs.

Article: "Cooling System Service": Volume 1 Number 1: Fall/Winter 2009: Pages 4-9:

another similar article is in the 2012 edition as well:


https://www.google.com/search?q=vw+tech+connect+magazine&oq=vw+tech+connect+magazine&aqs=chrome..69i57.5261j0j4&sourceid=chrome&ie=UTF-8#q=2009FW_VW_TechConnect_final_WebReady.pdf

https://www.google.com/search?q=vw+tech+connect+magazine&oq=vw+tech+connect+magazine&aqs=chrome..69i57.5261j0j4&sourceid=chrome&ie=UTF-8#q=2009FW_VW_TechConnect_final_WebReady.pdf
 
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