Golf 2.0 BKD coolant leak


New member
Oct 3, 2023
Golf 5 2.0 TdI
Hi guys I’m having some issues with my car lately. I’m loosing coolant every 200km or so. Mostly on the highway. The temperature is always 90deg, when I’m torturing it or not. I don’t see any leaks. It’s the 16v engine. I’ve read some topics in this forum earlier but nothing really helped. When I get the error for low coolant and I stop to refill it and when I open the cap it goes back to maximum. I’m aware of the head gasket and head problems but I’m hoping I could avoid that.


Veteran Member
May 21, 2017
2006 Jetta BRM
Look very carefully (with a bright flashlight) for leaks all over the engine and radiator. Pay special attention to the flange on the back of the head. If none noticed see if the exhaust smells like coolant. If that is ok you’ll need to pressure test the coolant system, for most people that’s a trip to the shop.


Well-known member
Dec 29, 2015
Istanbul, Turkey
2004 Seat Altea 2.0 TDI (BKD)
I'm having the same issues. Things to check are:

-chemical test to see if exhaust gases are in contact with coolant. if test comes positive, head gasket and/or head are faulty. BKD engines are notorious with casting issues. Check the part number of the head, it's visible from the top after you remove the plastic cover.

copypasta from
03G 103 308 A years 2003 to 2005.5 almost all cracked
03G 103 308 B years 2005.5 to 2006.6 only a few cracked
03G 103 308 C
years 2006.5 to 2007.5 none cracked (from what i've read, the C revision did not completely solve the problem either)

-coolant flange, at the "back" of the engine (driver's side with a transverse mounted engine like yours), just under the tandem pump
-EGR cooler (can be pressure tested off the car)
-oil/coolant heat exchanger (particularly if the coolant's gone darker)
-coolant reservoir cap (easiest fix to try, do this first)

Misery loves company. Please let us know how yours goes.