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VW Jetta TDI



  • shriftyshrifty Posts: 255
    I've only had the temp drop a few times, all due to extreme cold and sitting still for a period of time. Not bad otherwise.

    I've spent a fair amount of time in Chicago, actually my favorite city. Just not a fan of 90/94 traffic in rush hour....
  • shriftyshrifty Posts: 255
    I've got a friend that is about the same as your wife, I just crank up the heated seat to 5, and go as quick as I can hoping to get the heat to generate faster while explaining how it takes longer to heat up. At least she dresses appropriately for the winter.... :)
  • shriftyshrifty Posts: 255
    Hi jogo, I just joined the door lock module club the other day, it seems to be an issue with my rear doors. When I used the fob to lock, the horn didn't sound, and the light on the driver's side door flashed a bit differently and stayed lit. The left rear door didn't lock, and I was able to open it and the alarm went off.

    I can get the car to successfully lock if I open and then close the rear door, then press the lock button on the driver's side door, close the door, and then insert the key into the door and turn it to the right to lock. I know its a pain, but not sure how much it would be to replace the module. Would it be worth replacing, or just keep it as is? I'm guessing the warranty is out for this at 36K. Also, would anyone know how difficult it would be to replace by yourself or with a semi-competent friend? We're not exactly automotive gurus, but we can manage our way around.

    Some times I can get it to work with the remote, but I think I can do this only if I don't open the rear doors. I guess if it gets to the point where I can't lock them anymore, then I guess I'll have no choice.
  • shriftyshrifty Posts: 255
    It appears to be just an issue with the left rear door. When unlocking the doors, it is the only one that remains locked. As long as I leave it alone, the car will now lock normally. Kind of annoying, but I don't use it very often....
  • mamx4mamx4 Posts: 10
    I have a 2006 Jetta TDI. Bought it new. Always did all maintenance. 102000 miles. About 3 months ago, my MPG fell from consistent 42 MPG down to 32.9 MPG today. No loss of power over last three months, no erratic starts, runs and idles smooth as any diesel can. I can't figure out if it is something I have done or something needs to be fixed, but this car doesn't do 32-34 MPG, ever, until 3 months ago. Yes, I keep the tires up. Yes, I change the air filter frequently because I live in the country on dirt roads. No, I don't use K & N, so I haven't coated the oxygen sensor. I have run some injector cleaner through a couple of tankfuls to no effect. I run diesel pickups and tractors, but this is my first car with a diesel and this is driving me crazy. Any and all suggestions appreciated!

    Doc Mitchell
  • bpeeblesbpeebles Posts: 4,085
    edited July 2010
    Not sure if your 2006 has same adustment/setting but my 2003 has an "IQ" setting (Injection Quality) which, should be checked/adjusted occasionally. My VagCom has a special mode where it will draw a graph on the screen showing my IQ.

    My understanding of IQ is the baseline in the compression-cycle where the "start of injection" begins. (The foundation where ALL the fuel-injection pulses originate)

    BTW: Using a K&N (oiled cotton) airfilter will NOT coat the O2 sensor... instead, it coats the MAF sensor. (Mass AirFlow). An O2 sensor is in the EXHAUST system... not the intake system.
  • ops2ops2 Posts: 6
    Does it take longer? Sure. A lot longer? Not really. We're talking 2-3 miles before you get warm air vs 1-2, and the heated seat gets warm well before my old Saturn's heater was blowing even lukewarm.
  • bpeeblesbpeebles Posts: 4,085
    I dont know where you live... but here in Vermont... I can have the block-heater plugged in for 2 hours before starting the engine... and not get much heat out the the vents for my entire 10-mile drive to work.

    Granted, the outside temp. would be -15F and my drive is a lonely country road at 5:30AM.

    HOWEVER, the seat-heater warms my backside quite nicely. (Dont even EXPECT any heat from the vents!) For cold-weather driving, seat-heaters is the #1 best optoin to get.

    Lets not forget that the trade-off for exceptional econemy (MPG) is that the engine does not produce much 'waste' heat. The heat from the vents in the cabin are SOLELY due to an inefficent engine heating the antifreeze with wasted fuel.

    A 100% efficent engine would produce NO HEAT whatsoever. (All the energy in the fuel would be used to move the vehicle forward.... not produce wasted heat.)
  • colin_lcolin_l Posts: 591
    That doesn't sound too good.. what if it were snowing or sleeting? I do want some heat, of course, but I think you really need it to keep the windshield defrosted.

    Of course, it is rarely colder than 15 here in Kansas.
  • m6userm6user Posts: 3,174
    A 100% efficent engine would produce NO HEAT whatsoever. (All the energy in the fuel would be used to move the vehicle forward.... not produce wasted heat.)

    Believe me, the heat is not wasted when it is -15 out. :D

    I have leather heated seats in my vehicle but I can tell you that I have heat blowing out of my vents(gas engine) before I can feel the warmth from the seats to any degree. They both kind of warm up at the same time it seems.
  • vinchenz61vinchenz61 Posts: 12
    Im sure this is not your issue but thought it would be worth mentioning. I have a new 2009 TDI. I have a mix of highway/city driving but consistently getting up in the 40's. i noticed a drop of in the last couple weeks. it was the AC. Even on highway dropped off about 6-8 mpg.
  • mamx4mamx4 Posts: 10
    Hey, thanks for the reply. My Jetta, until the last 3 months, ran consistently at 45MPG during the winter with no AC. The AC has always cut it down to 41-42, but never down in the lower 30s.
  • eliaselias Posts: 2,120
    edited July 2010
    after a highway drive, brush a finger against center/hub of each wheel.
    you may find one much hotter than the others due to wheelbearing or dragging-brake-caliper - it could be so hot it will seriously burn your finger if you do more than a tap to feel the temp. if indeed one wheel/hub is much hotter like that, then you've found the mpg culprit.
  • hlcastelohlcastelo Posts: 45
    I have owned by 2009 TDI for 20 mos. I'm in South Florida where AC is required most of the year. In Highway driving with AC on I consistently get over 40 mpg. I have noticed that the mpg will be highest as long as you don't drive over 60 mph for extended period of time.
  • Mr_ShiftrightMr_Shiftright CaliforniaPosts: 57,327
    edited July 2010
    Edmunds has done two long term tests of 2009 and 2010 VW TDIs, and the average fuel economy was right in the same 31--34 mpg as reported here by some people. I'd have to say that for "normal" city/hwy combo, in the real world, winter/summer avg, all locations, etc. driven 24/7/365--that's about what it should be for most of us most of the time.

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  • bpeeblesbpeebles Posts: 4,085
    In my 30+ years in Vermont, I can tell you that SLEET cannot physically happen at -15F.

    Anyone who lives in Vermont knows it RARELY (if ever) parcipatates when the ambient temp is below 0F. The air is soooooo dry that there is no moisture available to fall from the sky. The coldest nights happen when there are no clouds. The earths heat radiates into space. (Radiational cooling) No clouds= no parcipatation

    In fact, one can watch the small amount of ice-crystals which are on the windshiled sublimanate in front of their eyes.

    You have not really experienced cold weather until you see sublimination happen right in front of your eyes!
  • conjettconjett Posts: 8
    once I get on the open road, I can get over 40 mpg (up to about 45 or so) in my 2010 JSW TDI that I've had for a month with the AC on. On the one day here in the Midatlantic in the last month when I didn't need to run the A/C, I got up to 49 mpg for some short stretches.
  • eliaselias Posts: 2,120
    edited July 2010
    sublimation is an awesome thing to see.
    One NH morning my backyard was colder than the Martian surface. :)

    The time when defrost/low-heat is a problem in TDIs is during an ice storm or snowstorm where the temperatures are in mid-20s. ice/snow can accrue by freezing on the windshield in stop^go/slow&go traffic because the engine is not making enough heat.

    With 10 TDI winters in new england , this has happened approximately twice,
    a partial workaround is to turn on every accessory & heating-elements (windshield, back window, mirrows) to make the engine work harder.
  • tldtld Posts: 37
    Car and Driver magazine commented on the no heat issue too. They said the Canadian models come with an electric heater that blows heat when the engine is to cold to do it. Do we know if this option is available in the states?
  • Mr_ShiftrightMr_Shiftright CaliforniaPosts: 57,327
    Perhaps you drive more conservatively or even smartly than Edmunds staff. But most of the magazines I consult that do longterm testing don't pst 40+ mpg except under one-time exceptional conditions, such as long flat stretches in overdrive with cruise control on. I'd guess that how you drive makes quite a difference---for instance, diesel engines don't need to be revved up as high as gas engines, and doing so just wastes fuel.

    My MINI varies between 26 and 34--that's quite a spread. It depends on how I drive it.

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  • gagricegagrice San DiegoPosts: 31,079
    My 05 Passat TDI would get 40 MPG out on the highway at 70 MPH. In town mixed it was more like 28 MPG. A radical change could mean something else. I would check bearings and brake pads first as suggested.
  • bpeeblesbpeebles Posts: 4,085
    Most vehicles which are "tested" by jurnalists are not "broken in" properly. Additionally, A TDI engine may take up to 20,000 miles to reach maximum MPG. (as measured by taking compression readings and observing at what milage the PSI reaches maximum.)

    Instead, a vehicle whcih jurnalists test are often driven hard and end up reflecting poor examples of real-world MPG numbers. Poorly broken-in engine gets poor MPG for life.

    I know my TDI torque-peak is at 1800 RPM and hence gets the best MPG at that point. If I am patent enough to drive 55 MPH, I can acheive nearly 60 MPG. However, my lifetime MPG average (over 100,000 miles) is 50 MPG.

    HOWEVER: The real measurement is COST PER MILE. This number can be used to compare to ANY vehicle running on ANY fuel. My TDI (over 100,000 miles) comes out to $0.05/mile. I dare say this is better than any other vehiclce sold in North America.
  • bpeeblesbpeebles Posts: 4,085
    Yes, all TDIs sold in Norh America contain electric heating-elements which help to speed the warmup of the antifreeze. This extra load on the engine also tends to make the engine warm up faster too.

    You can think of this as purposfully consuming more fuel just to speed warmup of the engine.

    Anyone who really REALLY wants to have heat can install a webasto heater. This consumes diesel from your fueltank to keep the engine toasty-warm.
  • eliaselias Posts: 2,120
    My 06 jetta TDI has the electric-air-heater. It's useful for getting defrosting working faster on the windshield - it is not capable of heating the cabin.
    I think the recent/09/010 TDIs have the electric-air-heater too.

    as far as MPG goes, my Jetta TDIs have never provided less than 40 mpg, over about 300k miles! OK, one exception: a ~100 mph tank out west - mpg did drop below 40 for that one!
  • Mr_ShiftrightMr_Shiftright CaliforniaPosts: 57,327
    Oddly enough, though, I have never seen a long-term test done by credible media that ever approached a 40 MPG long-time average. I mean by long-term maybe 30K++ miles, so breaking in is not a factor anymore.

    I suspect that what we are seeing is anecdotal vs. recorded data. I'm sure i could get 40+ mpg but I'm not sure why auto magazines can't seem to. If you see any longterm test that nails 40+ mpg, let us know. Maybe I'm just not looking hard enough.

    You know, multiple drivers, short trips---that can hurt mileage.

    MODERATOR --Need help with anything? Click on my name!

  • rrollntdirrollntdi Posts: 52
    I have a '09 Jetta TDI Sedan w/ DSG w/ 36K miles. I notice it takes about twice as long for the car to heat up in the Winter compared to the gas vehicles I've had ( except for my '03 VUE which never really got warm). The heated seats warm up in 3 or 4 minutes, which helps because the engine takes about another 6. I've not had any problems with windows fogging up in rain or snow storms, any more than any other car I've owned/leased. The vent control in the center vent helps divert the air to the windshield, so it might actually be a little better, when I remember to redirect it.

    Went on a trip from Detroit to Knoxville for Memorial Day weekend. The car was loaded with luggage and 2 adults. Ran the A/C the entire 530 miles each way at about 68 mph and averaged about 45.5 mpg including being stuck in Cincinnati traffic on the way down and in Lexington on the way back, for an hour each way. My daily commute of 22 miles (18 miles on 8 Mile Rd, a 4 lane divided highway with 4 or 5 stops each way and about 4 miles on M10, an expressway) averaging about 38 mph, I get about 48 mpg without the A/C on. With the A/C, it's closer to 42 mpg. Cooler temps make a difference too.
  • bpeeblesbpeebles Posts: 4,085
    (Mr Shiftright) There are 1000s of "long term" tests that get well over 40 MPG. Almost every owner of a TDI who has measured the MPG can attest to it. These folks are careful to break-in their engine and concensly drive with efficenfy in mind. (After all, that is why they drive a TDI in the 1st place!)

    The problem is that you are looking for jurnalists to do this. You are looking in the wrong place. Again... most TDIs driven by jurnalist are NOT initially broken-in properly AND are driven by lead-footed folks who are looking for accelleration.

    A poorly broken-in engine will FOREVER be a poorly broken-in engine. Nothing short of pulling the pistons and re-honing the cylinders can correct a poorly broken-in engine. (Then, of-course, followed by a careful break-in procedure)

    Try to realize that driving a TDI like a Porsche every day and then complaining it "only" gets 40 MPG is the real testamant to the efficency of these vehicles.

    I submit to you MY long-term test of my 2003 TDI. I have recorded EVERY drop of fuel ever pumped into the tank into an extensive spreadsheet. (over 100,000 miles)
    Overall average MPG = 50.0
    Overall cost-per-mile = $0.05
  • gagricegagrice San DiegoPosts: 31,079
    Speaking of long term VW TDI experience, where is Ruking? Since he got that new Jetta TDI he is missing in action. Just cannot stop driving it is so much fun, is my guess. He kept good records of his fuel used and got consistent high mileage even driving fast.
  • colin_lcolin_l Posts: 591
    I've got an app for my android phone that tracks mileage, price, etc and it takes me about 10 seconds extra per fill-up. 30 seconds on a bad day. :) but... I don't have a TDI yet, I'm just shopping.

    * FYI my cobb stage 2 Evo gets 22 mpg overall, 26 highway @ 75mph.
  • gagricegagrice San DiegoPosts: 31,079
    That sounds great. I have a check register in each glove box with a pen. I input to Excel when I get home. That would save one step. Those are cool phones. I am just too cheap to get a full blown cell plan.
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