I got a low coolant light so went to check the reservoir and it was super low. When I went to close the cap I noticed (under the engine cap) there’s a 2nd reservoir and that seemed full… I took off the engine cover and the 2nd cap indicated that it was also a coolant reservoir (just smaller and it had the same coolant)

Can someone confirm that there is 2 reservoirs and what is the purpose of the 2nd one (maybe for the turbos or backup?)

Also I couldn’t find the marking to fill to on the side of the MAIN reservoir is someone can help by chance.

Thanks Gents

 

The smaller reservoir is for the Intercooler and Transmission cooler.

If you look straight down through the fill hole, there's a plastic "T," the coolant should just cover the "T."

 

To add to that, engine coolant (main circuit coolant reservoir) feeds the turbochargers -- it uses the same circuit as the engine. Whereas the low temperature circuit coolant reservoir feeds the intercooler and trans cooler as stated.

 

Yup that sums it up : )

 

does someone have changed the Intercooler coolant, i guess there should be some interval for it or?

 

I recommend doing it at the same time as the other coolant.

 

thanks, i found another threat and same was stated, i have to see my last bill from MB if they have changed or top up my coolant

 

Sounds good : )