Hi, I am after some help trying to find the source of a coolant leak.

I have a 2009 Octavia mk2 2.0tdi VRS. It started to leak coolant about 2 weeks ago. I have to top it up approximately once every 2 days to stop the light coming on.

 

I can't see the source of the leak as it seems bone dry around the expansion tank and pipes coming out of it. I jacked it up and took of the under tray and it seems to be coming from the rear centre of the engine. Nothing down either side or at the front.

 

I tried K-seal but this hasn't stopped it. It also seems there might be some oil mixed in as it is staining the road underneath the car. Any suggestions?

 

Thanks Lee

10 hours ago, Lj1784 said:

Any suggestions?

Do a (fluorescent) dye test.

What will the test show up? I can't see the back of the engine from the top or the bottom. Do you know if there are any common faults originating from that area?

EGR cooler?

Is the rear centre of the engine wet or shows dry coolant residue or was there coolant on the rear of the undertray?

 

Ours had a leak and the undertray was covered so didn't give much clue to where the leak was. Turned out to be a leak in the radiator at the drivers side. Inspection showed dry coolant residue under the radiator at that side.

 

For info, the OEM radiator was made by Hella and a new identical Hella one was just over £60 online, much cheaper than the dealer price.

 

The rear bottom of the engine is wet. When I get under the car with the under tray off I can see water dripping off it. I think a trip to the garage is in order as I can't get to or see the source of the leak.