How do I kno or find out when a regen occurs? I have a 2014 Passat tdi and just blew rod threw my blow. When I got to the side of the rode there was engine coolant all over my engine bay. My car is mostly used for short trips back n forth to work across town. But at this particular time I was on a long drive jumped on the highway from a back rode and was rappedly accelating up to high way speed and it blew a rod threw the block. The car has 60k miles on it now. But after reading this post I do remember towards the end of our winter here the heat just wasent getting as hott as it used to when I 1st got the car and it took longer for the heat to in the car to get hott. The car was at normal operating temp when I started the rapid accelerationKnow someone here was changing their coolant annually to prevent heater core from clogging up but it still clogged up. Most of us have to deal with freezing temps in winter so increasing ratio of water to coolant isn't really a solution. You're in Michigan so I know you get the cold - I'm by the Indiana/Michigan line. I'd stick with 50-50 coolant.
A tune should take care of the clogging (or at least minimize the regens/clogging) from what I've read here. I'm just waiting for the extended emissions warranty to run out as it has come in handy for a couple of issues already.
Without a tune best advice is to avoid short trips if possible. Worst thing one can do is turn engine off in mid-regen. Best to have engine get up to normal operating temp and run it on the highway on a regular basis. I have a 70 mile round trip commute and can plan on when a regen occurs as I monitor my soot levels via Polar-FIS. I've found the regens are consistent and predictable with the CVCA which wasn't the case with the 2014 CKRA that I previously owned. I have another vehicle I use for short trips in town so I save my Passat for the commuting and long trips.
Wish these CVCA engines/emissions system were like the ALH cars but they're not. Life is too short to worry about this.
One other thing - if you start losing heat get the heater core changed soon as possible! Mine failed on a road trip. I was able to get to my destination but hardly any heat. Unfortunately it was 600 miles to home - made it a third of the way but due to the clogging the hot coolant got backed up on the inlet side of the radiator (clogging restricts the flow of coolant) which then melted a hole in a plastic fitting! Dealer #1 replaced fitting but did not change the heater core - said it would get me home which was not the case. Only got 175 miles down the road and another melted hole. Dealer #2 did same thing as #1 and again said it'd get me home. OK, 30 miles up the road - same thing again! Dealer #3 changed the fitting and the heater core - finally was able to get home. Yes, first two dealers just replaced the failed part (melted plastic fitting) without figuring out what caused that to happen which was the clogged heater core. So don't delay in replacing a failing heater core otherwise you're bound to have the experience I did.
Thanks for the caution -- is this a problem that was apparent right away, or did it do it one day out of the blue? Did you ever find out the cause? This is the only time I've heard of any problems with it.Be very careful with the polar fis, if the car every acts odd, ie won’t respond to the remote at all or won’t start, disconnect the polar fis immediately. My polar fis caused my car to loose all communications and stop moving as well as lighting up the dashboard. Luckily it did it where I could roll backward into the parking lot at work, the rest of my commute is highway at 55-70 mph and could have been catastrophic.
Thanks for the head's-up...I had it about 18 months, first incident (acting strange with the key) was on a Saturday. Catastrophic failure was thursday of the next week. Scanned the car, several lost communication faults covering all major systems of the vehicle. Removed the polar fis and a friend and I drove it several times over the next 10 days with no issue, reconnected the polar, no start and no communication faults again. It’s been 10 months with no issues. Returned the polar to the company in Spain, never heard from them again, that was july 2020.