![]() Outside the car, their was water being omitted from the expansion tank. Long motorway drive and at idle could hear the gurgling noise from dash area and no heat from the interior vents. The car was fine for six months until the weekend just gone. Reconnected and topped up the coolant - and nice warm air from the vents. Water was flowing freely through the matrix and coolant was clean. I disconnected heater matrix pipes and flushed with a hose (you can only flush 1 way on this matrix due to the design). I took the car away as i wasn't convinced Booked it into VW - they said it's a very common problem and recommended new expansion tank and new matrix (£819). Inlet pipe to matrix was hot and outlet cold. Ours started 6 months ago with no heat from vents and a gurgling noise behind the dash area (matrix?). I think this maybe all interconnected with the silicant in the expansion tack / heater matrix blocked issue? Have this exact problem (which started as no heat from vents) in my wife's 2013 Golf 7 TDI some sensor is giving false readouts about coolant temperature (dashboard gauge never go over 90☌) and causing it to boil somewhere.ĭoes your coolant look "rusty"? I read somewhere that is the sign of overheated coolant and that sediment can cause cabin heater to clog. most recently figured out I might have a clogged cabin heater, since sometimes cabin doesn't get warm for an hour or so, but sometimes works fine (could even be air in heater element?) - I haven't found reasonable connection with the problem yet.Ĥ. something to do with thermostate and therefore failing to cool it sufficiently during highway regen.ģ. the cooling fan doesn't turn on at the right time (if braking from 130 to under 100kph on highway) - causing it to boil somewhere in system.Ģ. So I have few ideas (when doing dpf regen):ġ. Previously I had expansion tank and cap replaced also. Maybe it was the result of good bleeding it lasted so long. I had car at a VW dealer and they said there was a too agresive coolant (!?) inside, so they cleaned it, replace it with fresh G13 and bleed, but after 6 months problem was back. Although when it's doing regeneration in normal urban speeds it never overflows. I allways get a alarm next morning when I come home from a long trip on a highway. It never overflowed if it was pushed hard on a mountain pass road (120☌+ oil temp) - I excluded head gasket. ![]() It happens only when car is doing active DPF regeneration and at the same time driving on a highway with medium speeds (100-110 kph). I have for a fact got a bit deeper into symptoms. I have exactly the same problem for over a year now.
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