Intercooler coolant hoses COLD

[vdiksas]

Hello guys,

I own a VW T6 2017 2.0 TDI (150 HP).

Long story short - coolant was leaking, head gasket, EGR fixed but it's still looses coolant. I found out that the intercooler coolant hoses are at best - slightly warm if not cold even though the engine is hot. Is it normal or we are looking at the blockage somewhere? Here is the picture for reference.

Would love to hear from you guys what's your thoughts about it. Maybe is that "valve" that comes from the coolant tank? (in a red square)

Thank you so much.

 

[Paynewright]

There have been reports of the silica bag in the header tank splitting open (where fitted) and the ‘beads’ blocking parts of the coolant circuit. I posted about removing mine on the forum somewhere - try the search.

Are you sure it is not just an air lock?

 

[vdiksas]

There have been reports of the silica bag in the header tank splitting open (where fitted) and the ‘beads’ blocking parts of the coolant circuit. I posted about removing mine on the forum somewhere - try the search.

Are you sure it is not just an air lock?

I have done probably 5,000 kilometers after the head gasket repair. I am taking the car to the shop next week - they said they found a leakage somewhere after the pressure test but this thing does not give me peace. I just want to know if it's normal that these hoses from intercooler are cold or they should be the same temperature as the rest of them.

 

[Dellmassive]

there is a high and low coolant circuit. . with separate pumps.

thats the water cooled charge cooler, which is separate from the main engine block cooler.

possible pump issue?

but needs a VCDS scan tool session to test the pumps and read the temps.

 

[Dellmassive]

more info here :

SSP 561 - The T6 Vehicle

VW Self Study Programme, Document 561 - The T6 2016 Benchmark in its class Pioneer in the segment for more than 60 years The totality of all the product characteristics ascribed to the Volkswagen Transporter has made it the epitome of its...

www.t6forum.com

SSP 564 - The T6 2.0L TDi

VW Self Study Programme, Document 564 - The 2.0 litre TDI Engine In The T6 The introduction of modern, particularly efficient Euro-6 engines represents a central feature of the new T6. All units are equipped with Blue Motion Technology as...

www.t6forum.com

 

[Dellmassive]

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www.t6forum.com

 

[mmi]

Even more detailed information down to exact engine type - section 19 Cooling

T6 - 4-cylinder common rail engine CXEB CXFA CXGA CXGB CXHA CXGC CXHB

Workshop manual for the 4-cylinder common rail engine CXEB CXFA CXGA CXGB CXHA CXGC CXHB

www.t6forum.com

 

[mmi]

Indeed - it's a low temperature circuit - stabilized with an electric pump.


Note: the temperatures are charge air temperatures (not circulating coolant temperatures)

 

[mmi]

Yet another plot - at more reasonable ambient temperature. Anyone can tell when did the DPF regen happen?

 

[vdiksas]

Indeed - it's a low temperature circuit - stabilized with an electric pump.

View attachment 250001
Note: the temperatures are charge air temperatures (not circulating coolant temperatures)

Thank you so much! The water pump was changed with the head gasket work.

 

[Dp707]

Thank you so much! The water pump was changed with the head gasket work.

Hello, sounds like you are confusing the main cooling circuit water pump (mechanically driven, which they probably changed) with an additional motor driven water pump for the inter cooler circuit. Ie pump 6 has been changed but not 12 on the diagram.
The reason I’ve been reading this forum is my work vehicle is a t6 and they say the intercooler needs replacing. I asked why as no coolant loss, they said coolant doesn’t pass though the intercooler, after reading this forum I’m not sure the garage know what they are talking about as it seems coolant does pass through to cool the charge air. Think they said it was corroding underneath.
The level of complexity of this cooling system has opened my eyes, a lot to go wrong… 4 pumps to start with.

 

[Dp707]

Just found more info on my vehicle, apparently it’s a t5.1 not a t6 (repeaters not in crease), 1968cc 84kw/113bhp, so does anyone know if the cooling circuit shown in the diagram applys to my engine?

 

[Dp707]

Just found more info on my vehicle, apparently it’s a t5.1 not a t6 (repeaters not in crease), 1968cc 84kw/113bhp, so does anyone know if the cooling circuit shown in the diagram applys to my engine?

I’ve found info on the t5.1 intercooler and it seems to be air to air, a lot simpler and the garage is correct. I’m still surprised at the complexity of the t6 method which appears to be air to water.
I didn’t have any symptoms of failure, no lack of performance or limp mode lights, so assume it’s just being changed as a preventative measure to preempt such problems.
It’s also in for wheel bearings, deafening whine, and rattling dual mass when cold