Fan Continues Blowing After Car is Off
- #4
I'm not sure what caused this behavior but I'm interested to know if anybody else has experienced this same thing.
-Thanks, Todd
Everyone with a 2009+ TDI has experienced this same thing. It is perfectly normal. The regeneration cycle for the DPF is burning off accumulated soot. This generates a lot of heat and the fans running prevents all the plastic bits under the hood from melting. It's nothing to worry about.
Would you please explain a bit further?
This is our first Diesel car, so although it felt like strange behavior I just thought it was probably normal.
See above. The DPF (Diesel Particulate Filter) catches soot. When it gets full the ECU starts a regeneration cycle which burns off that accumulated soot. It is completely normal behavior.
A search for "fans running" or "fans racing" on this site will discover dozens of threads just like this one.
Have Fun!
Don
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- #5
Odor is from the new paint/plastics, etc. getting heated for the first few times. The odor will subside over time. Engine temp rises (not seen on the temp gauge), and if the engine is idling, idle speed will bump up to c. 1k rpm.
The DPF (diesel particulate filter) generates HUGE heat, hence the fans (both) are running on high, pulling air through the radiator, around the engine, and exiting below the firewall...that's why you feel it under the body of the car.
Do an advanced search for "DPF" or "regeneration". Lots to read there.
FYI: An active "regen" will occur every 300-400 miles, unless you do a lot of highway (steady-state cruising around 2k RPM) driving, where passive regens occur as needed.
- #8
My sales guy did two things right for me. Set up my convenience features and told me about regens.
Said he was tired of panicked calls about cars burning up.
Still weird the first time it happens. You'd think VW would have a TDI basics brochure or some kinda quick study guide vs that stupid brochure on changing the radio stations and turning on the wipers.
Niner
duplicate account, banned
- #9
I searched a few message boards and didn't find any answers yet to this situation.
This occurrence happened twice to me tonight. I drove about 8 miles out to a friend's house (80% freeway) and when I turned the car off the engine fan (not sure if it was the radiator or auxiliary fan) kept running for 30 seconds. The outside temperature was around 55* and I wasn't pushing the car hard.
Drove the same way home and when I pulled in my garage the fan(s) did the same thing, but this time for nearly 2 minutes. I popped open the hood and didn't see anything strange. Surprised that the fans were still running, I turned on the car, let it idle for 5 seconds then turned it off. This time the fans stopped.
I'm not sure what caused this behavior but I'm interested to know if anybody else has experienced this same thing.
-Thanks, Todd
Page 320 and 321 of your Owner's Manual, that thing you are supposed to read cover to cover, to understand how your car works.
- #11
Here we go again!! this time on the Passat side......how many threads will we see here?
- #13
Yeh I guess....
- #14
It averages about 5 a month, give or take.
- #15
I have said it before and I will say it again....these cars are not for everyone! Please check it out carefully before you buy! With gas prices rising as they are they are going to sell a bunch! And knowing what I do now I wouldn't buy one!
- #16
No, you'd buy one every couple years, as you have for the past couple decades, LOL. You change cars more than I change shoes!
- #17
Actually I have been looking for a 2005-06 CDI Benz! And my 2 96 Passats have been here for years . Need to sell at least 1 or both of them!
- #20
Or you could just read the owners manual . . . I have *zero* sympathy for folks who don't know things that refuse to read the documentation. The dealer should not have to spoon feed the buyer anything . . . just take the car home, and read the d**n book. And to the whiners, no, it's not hard to read . . . and does tell you what you need to know . . .
- Tim
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- #21
owners manuals can be drastically wrong, the 2015 vw manual says the diesel takes 4.5 quarts of oil when it takes 5.8 and my Dodge ram manual says to use se rated 10w30 oil in the diesel that would instantly void the warranty of my Cummins engine, my Honda crf450x owners manual says the transmission takes 600ml of oil when it takes a full liter and people online complain about the rear wheel locking up when floored in 5th causing them to wreck- 600ml of oil doesn't reach 5th gear when at 70mph
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- #22
Can't speak to the VW, but on the RAM, if you readthe diesel supplement manual and not the'base' (gasser) manual that comes with it, you will likely find that the manual is correct. And I doubt they could legally void a warranty if you did what they printed (assuming yiu use the right book . . .).
- Tim
- #23
Disclaimer- I am a cover to cover manual reader Here is the ram manual- your right the folks on the diesel truck resource borads say the cummins wouldn't be bothered by the 10w30 one bit- but ya never know what angle the manufacture would take. never less, its only seen delo 15w40 its entire life
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- #24
if that's what they now specify, then that's what they support, and I have no idea why you think you know better . . . Oh, and I see that's an *OLD* one with the 5.9, so the special oils to not clog the DPF are not required . . . makes sense. I thought you were talkimg about a current 6.7 . . .
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- #26
If you feel the question is stupid, just don't waste your time reading or responding. Just gives us another response to read through, not much help.
VeeDubTDI
Wanderluster, Traveler, TDIClub Enthusiast
- #28
Fans will run if coolant temp is 212F or higher (it might actually be 211F). Some Passat owners have reported fans running after shutdown on a regular basis, and it's because their coolant temps are slightly elevated. This could be due to your routine, or due to your thermostat being slightly warmer than others. I'd consider it normal, but if it bothers you, let it idle for a minute before shutting it off, and the temps should drop below the threshold for fan after-run.
Source: https://forums.tdiclub.com/index.php?threads/engine-fan-still-running-after-the-car-is-turned-off.344500/
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