Hi guys! I have a Octavia Mk1 1.9 Tdi Pd. I have been having overheating issues which were solved by getting the radiator cleaned (internally). 

I got the rad cleaned, drained the old coolant, flushed the system, and refilled with the correct type of coolant (G12).
There is no visible white smoke from the exhaust at start-up, or when the engine is at its operating temp. (90 deg according to the temp gauge on cluster).

 

Today while driving I got the coolant low warning lamp (Warning lamp blinking accompanied by 3 beeps). So, I let the car cool down, and opened the reservoir cap only to find muck (oil mixed with coolant) in the tank (pic attached from the internet but mine looks somewhat similar). I am suspecting  the oil cooler which is situated below the oil filter has failed internally which is letting the high pressure oil into the cooling system.
My question is, if I am unable to source the oil cooler immediately can I bypass the same as a temporary fix?
Also, there is normal amount of oil in the intercooler so I know the turbo seals have not gone bad. Had cleaned the intercooler 5k kms back. But the oil level on dipstick was low, have topped it up for now. I'm guessing this is the only place from which the oil seems to be escaping. The car has done 94K kms till date.

 

Thanks in advance.

 

Regards 

Shreyas Rane

 

 

how is the oil looking? 

as you said the coolant low warning light came, if it is the oil cooler, and oil is in the coolant while the coolant level drops there then also is coolant in the oil...

The oil is looking completely fine.... there's no water in oil.... I've inspected the dipstick and the filler cap. Just the level was a bit on the lower side which I've topped up.

Yes, bypass the cooler.

Is it safe to bypass it as a temporary fix or will it have any adverse long term issues?

Perfectly safe, just be aware that some oil is going to leak out of it.