Hy there !

Have some coolant problems with a Mk2 Octavia Vrs TDI Dsg from 2008

it has the Cr engine in it , CEGA

Few months ago when the DPF was doing it’s regen , warning light on the dash appeared: Coolant level Low

stoped the car and opened the bonnet

the antifreeze jug was empty …. when i opened the lid all the coolant came back in the jug …but loosing some coolant , it wasn’t att normal level .

After inspecting the car at 2 mechanics, they found the EGR cooler leaking and full of antifreeze

Changed the part with a genuine Vw part

But the problem is that now every-time the cars doing it’s Dpf regen , the coolant disappears from the jug and after opening it it reappears at normal level

The mechanic Tested it for head gasket failure( gases in the cooling sistem) , pressurized the sistem with vacum and everything seems ok ….

Has anyone had this kind of a problem , and found some kind of a solution ?

Please help me, any ideas are appreciated

Ps , when i start the car in the morning, it sounds like wather is flowing trough the inside heater exchanger …

It takes a long time for the coolant to reach 90’ , and after that it stops blowing heat trough the vents , but if i open the coolant reservoir… it starts blowing warm again

It is likely that your cooling system has an airlock, this may eventually clear by itself, in which case the coolant will require topping up - or it may require to have a recommended bleeding process of the cooling system carried out.

NB. this air purging process should have been carried out by the mechanics who replaced the EGR.

Try squeezing the top rad hose and holding for a few secs then release and keep doing it for a while. Had a similar problem when I changed timing belt/waterpump on my old 1.9tdi. After a while I got a rush of bubbles into expansion tank. Think the air was in the heater matrix. Topped up and it was fine after that.

The problem was The interior heat exchanger , it was coughed

changed it , and now everything is ok

Thanks !