Hi,

 

I'm hoping someone here will be able to provide a potential remedy for my 2014 Octavia estate, bought 2nd hand in 2017. It has the 2.0 Diesel engine and for the last couple of years has been loosing coolant on an intermittent basis, in the last few months it has been more regular. I can run the same route and it can lose coolant to trigger the alarm (I pull over and immediately top up), or the level can stay relatively unchanged. I'm a more sedate driver so I'm not pushing the engine.

 

• The original reservoir (with silicate) was replaced (and pretty mucky at the time) a couple of years ago, it was then good for a good 12 months. The new reservoir is not marked with silicate.
• The water pump and timing belt have been changed this year.
• Temperature is good, it just warms to 90°C and sits there.
• Oil is good and no sign of any coolant ingress.
• The coolant itself is clear and doesn't smell of anything.
• The car drives fine, no loss of power and no other warning lights are triggered.

 

The coolant is escaping from the reservoir as it is beading around the edge, but not flooding that side of the engine bay (If you put too much coolant in then it does a bit). It has been to my local independent VW specialist 6-8 times so far this year and they can't locate the fault. The reservoir cap is currently brand new, replaced on the last visit.

 

My gut feeling is that the coolant system either has a partial blockage forming in the system (but the temperature is unaffected, at least detected by the thermostat/sensor) and/or it is over-pressurising. The pressure/coolant is then released through the reservoir. 

 

I may ask the garage to replace the reservoir and give the coolant system a good flush. I'm happy to alter the plan if someone else has another idea.

 

Cheers for any advice

 

 

Hello @Stuart56

have get any conclusion about this problem?

thanks

Hi,

I think so, the heater matrix was blocked so I swapped it over for a new one (my local garage had recently flushed the coolant system). It was losing coolant whenever the DPF regenerated, hence the intermittent loss. See this thread:

 

 

Best regards

Stuart