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    Thread: DIY: Replacing your temperature sender with the updated one (green-top)

    1. 07-23-2007 03:24 PM #106
      Will this correct the flashing of my coolant temp light?
      I have a 2002 1.8T GLS Jetta. My coolant temp light flashes until the temp reaches 190F then i shut off the engine and restart and it goes away. Help this is very annoying.

    2. 07-31-2007 12:25 AM #107
      thinking about doing this, 02 jetta but my engine temp on my dash sits at 0, HELP!

    3. 08-30-2007 12:04 AM #108
      Quote, originally posted by asharp27 »
      thinking about doing this, 02 jetta but my engine temp on my dash sits at 0, HELP!

      For <$20 it's worth it. Just did it to my 2002 GTI.

    4. Member Jokerjokester55's Avatar
      Join Date
      Sep 6th, 2007
      Toronto ON
      1999 MKIV Jetta
      09-10-2007 12:34 AM #109
      ummm this is weird guys, i just checked mine after checking the DIY (good write up by the way) and my Engine temp sensor is blue........??????? ummmm yeah, any thoughts guys? i drive a 1999.5 Auto Jetta, 2.0L
      any thoughts would be great

    5. Member
      Join Date
      Oct 30th, 2003
      09-10-2007 01:17 AM #110

    6. Member Jokerjokester55's Avatar
      Join Date
      Sep 6th, 2007
      Toronto ON
      1999 MKIV Jetta
      09-11-2007 12:43 AM #111
      what? i don't get it?

    7. Member Jokerjokester55's Avatar
      Join Date
      Sep 6th, 2007
      Toronto ON
      1999 MKIV Jetta
      09-17-2007 07:53 PM #112
      does anyone know any reason why my sensor is light blue in color?? is it cause i have a 2.0L? if some one can let me know that would be awesome.
      thanks again

    8. 09-20-2007 04:46 PM #113
      i dont care what people say, you are the MAN for making this write up!

    9. 09-21-2007 12:59 PM #114
      Quote, originally posted by lsmag &raquo;
      Will this correct the flashing of my coolant temp light?
      I have a 2002 1.8T GLS Jetta. My coolant temp light flashes until the temp reaches 190F then i shut off the engine and restart and it goes away. Help this is very annoying.

      if you still have this problem, changing the cap for your coolant reservoir will probably fix it. as the car gets older the cap loses it's ability to hold in the pressure - it is a pressurized system

    10. 10-06-2007 01:14 AM #115
      So i attempted to do this DIY and split coolant all over the ground, i lost the O ring, and i need more coolant now. My question would be what kind of coolant would i need to get or does it really matter for a 2002 2.0 golf, and does it matter which o ring i get. Do i have to worry about air in the line and i was reading something on here about getting phosphate free coolant. ??? i have no idea.
      1.What type of coolant.
      2. What type of O ring. part # possibly
      3. Worry about Air in the Line
      4. Phosphate Free coolant?
      no VW dealer for about 150km can i picked this up at a parts store if im specific on what i ask for?
      Thanks a bunch

    11. 10-06-2007 01:28 AM #116
      is this wrong forum, im still too new 1.8t engine forum yikes sorry

    12. 10-16-2007 03:58 PM #117
      Thanks Foshizzle I will try that!

    13. Member JettaGetUpandGo's Avatar
      Join Date
      Mar 1st, 2005
      Pewaukee, WI
      2005 Jetta GLI, 2011 Touareg TDI
      10-17-2007 09:37 PM #118
      I have an 05 GLI and pulled my engine covers off for painting. I decided to check the coolant temp sender and much to my surprise I had a black one!
      I stopped at the dealership today and picked up the green-top sender ($25.87), o-ring ($1.18), and retaining clip just in case ($0.38). When I walked in there were two already sitting on the counter that someone was on their way to pick up. There was also a bin of these right under the parts counter. I'm guessing they sell quite a few of these!
      I'm doing work. (Build Thread) | VCDS Scans / Tweaks in the Waukesha / Milwaukee area for $5 or a 12-pk of Mountain Dew

    14. 10-21-2007 11:08 PM #119
      FWIW Mine just died and AutoZone's part is only $6 and has a 1 yr warranty

    15. Member handed's Avatar
      Join Date
      Apr 26th, 2002
      10-23-2007 12:30 PM #120
      My temp gauge in my cluster is sporadic, sometimes working and other times is it not reading at all
      Will changing this sender fix the problem?

    16. Member phastman's Avatar
      Join Date
      Oct 25th, 2000
      Clayton, CA
      2012 CSG Golf R, 2004 MKIV R32 (sold)
      10-23-2007 01:42 PM #121
      My wife just took her 2001 Jetta 1.8T into the dealer and they quoted $900 for "thermostat sticking. Engine coolant temp sensor out of range and corroding the connecting wire." Do you think just replacing the coolant temp sensor will fix this or will I need to replace some wiring also? I can't imagine the stealership would try to charge $900 just for replacing the sensor.

    17. 11-29-2007 01:19 PM #122
      <I have a 2002 1.8T GLS Jetta. My coolant temp light flashes until the temp reaches 190F then i shut off the engine and restart and it goes away. Help this is very annoying.>

      Did you ever fix the problem? My '03 GTI is doing the same thing. I still have to check to see if I have a green sensor or a black one, but it sounds like a good place to start. ECS is selling them for $20. Anyone found one cheaper recently?

      Modified by Stukadriver at 10:28 AM 11-29-2007

      Modified by Stukadriver at 10:31 AM 11-29-2007

    18. 11-30-2007 02:23 PM #123
      No its still doing it , I have replaced the sensor with one that i bought at Autozone. I still haven't changed the the expansion tank cap though.
      I have changed the expansion/coolant tank cap with a new OEM one and it still flashes. One thing I noticed when I changed the cap while the engine was warm and depressurized the tank the light did not come on. When I started the car the temp was between 0 and 190.
      Help anyone!! I know I'm not the only one with this problem.

      Modified by lsmag at 6:20 PM 12-2-2007

    19. 12-03-2007 07:06 PM #124
      My temp light usually came on a few seconds after a cold start and stayed on, but if I started it when warm or just restarted it after warming up, I didn't get the light. I changed the sensor (it was a green one) today with the Autozone sensor. So far, so good, but I have to give it a day or two to be sure...

    20. 12-03-2007 07:11 PM #125
      I also noticed that the wire from the sensor was a little loose at the other end. I don't know if it was enough to be a problem, but it clicked when I pushed the connection together.

    21. 12-03-2007 11:49 PM #126
      Disregard. The same problem happened again when I started it cold.

    22. 12-04-2007 08:29 AM #127
      Mine has the exact symptom's that your VW has. I bought an OEM expansion/coolant tank cap @ VW for $8.00 it worked for a little bit. When I replaced the cap the engine has been cooling for about an hour or two. The tank depressurized and the light didnt come back on, until the next morning.
      Anybody help, I'd hate to take it to the dealers!

    23. 12-04-2007 11:33 AM #128
      I might try replacing the coolant tank itself, which includes the quantity sensor. That's about the only other cause for that light to come on that I can think of.

    24. 12-04-2007 02:35 PM #129
      That was my next option, $19 oem @ VW dealer.

    25. 12-22-2007 09:41 AM #130
      Wow, that was too easy. I'm not car smart, I can put in stereo and speakers but I avoid under the hood. This sounded easy enough for me to try, the hardest part was figuring out how to remove the harness. I didn't remove the engine cover on my 03 Jetta and had no issues getting to the sensor. It only took me 5 minutes and I was really nervous that it went too easy. Thanks for the pictures that definitely boosted my confidence in doing the job. I look forward to the opportunity to do more under the hood of my car with great posts like this one.

    26. 12-27-2007 11:27 PM #131
      Thanks for this post. I have the same problem with my 03 Jetta 1.8T. Dealer wanted to charge me $450 to replace the thermostat, sensor, etc. I don't think I need a new thermo. The car runs fine, takes about 10 minutes of driving to heat up to 190 and never goes above. So I think it's just the sensor.
      My temp light started blinking last week, but only when I'd first start up the car. If I shut it off and started it again it was fine. Since yesterday it started doing it in the morning and also in the evening when I'm leaving work. I have to drive it for a few minutes and then shut off the engine and restart for the blinking to stop.
      I'm going to call around the dealers tomorrow and see if I can get a good price on the sensor, o-ring, and retaining clip. I'll post my results.
      FYI, I was also having the same problem with the car misfiring on cold mornings. That was a different issue. I don't know the code as the dealer didn't tell me, but they did a "software update" to correct "cold start misfires." Cost me $130, but it did the trick and I haven't had any problems since.


      Modified by 87Rocco at 4:37 AM 12-28-2007

    27. 01-06-2008 10:42 AM #132
      I think code 17664 applies to the sensor being faulty too. On the diesel engine it is between the bulkhead and enging block on the drivers side and the clip must be pulled down to take out the sensor

    28. 01-07-2008 11:06 PM #133
      good write up I just got my gti this week so it's nice to see someone break down the simple stuff to the newbs out there thanks again

    29. 01-08-2008 11:24 AM #134
      Well, I had my mechanic take a look at it, and he found that the auxiliary water pump (yes, it has that) was leaking some coolant. The part is on order, so I don't know whether that was the real problem or the overflow tank sensor is faulty. Any luck with yours, Ismag?

    30. 01-08-2008 12:25 PM #135
      Here's my report. I changed out my coolant temp sensor the weekend before last. I let the car sit overnight, then the next morning I disconnected the negative terminal on the battery (to reset the CEL) and swapped out the sensor. I put everything back together and started her up. The CEL light was gone, but the temp light was still blinking. So then I looked at the coolant level. It didn't appear to be low, but I added some anyway.
      After adding the coolant, the light continued to blink, but not as often and for not as long. I.E. It would only blink first thing in the morning, and if I shut off the engine and restarted it, the blinking would stop.
      However, now a week has passed and I'm back to square one. The CEL light is back, and the blinking continues until the car has been driven for several minutes. It also happens more than once a day now, not just in the morning.
      I'll check the coolant level again, but I suspect the tank is still full. Which means I'll probably have to swap out the tank and/or tank sensor. Thanks for keeping this thread going, I'll be interested to hear what others find out.

    31. 01-09-2008 02:00 PM #136
      Stuckadriver, No changes...been avoiding going to a mech to take a look at the problem. I havent replaced the expansion/coolant tank yet. I dont know if that will help at all. Keep me/us upto date if that resolves the friggen blinking light.

    32. 01-14-2008 09:47 AM #137
      It turns out the coolant was low enough to cause the light to come on. I guess it was still warm enough when I checked it to appear to be at the normal level. After 5 years, it was due for a change. Anyway, the aux. water pump was leaking, corroded, and unplugged - not sure if it came that way from Wolfsburg or it just came loose. $246.68 later, the blinking light is gone!
      In an unrelated problem (I think) the engine ran rough for a minute this morning and the CEL light came on! This has happened before, and it went away for no apparent reason.

    33. 01-14-2008 11:54 AM #138
      Nice to hear...I guess?!? I wonder if thats the same thing thats going on with everyone else's jetta and if its only the jetta that has this problem. Ive looked online and its not a cheap part like the sensor. I dont think anyone else has reported that to be the cause of the flashing temp sensor?
      Well congratulations on getting that fixed soon mine will be gone too. Thanks for the heads up on the aux pump!!!

      Modified by lsmag at 8:55 AM 1-14-2008

    34. 01-20-2008 10:53 AM #139
      Yeah, it was an expensive fix, but it had to be done since there really was a coolant leak.
      The engine only ran rough that one time the other day. I'm hoping it was just a little water in the fuel or something like that.

    35. 02-05-2008 11:26 PM #140
      my engine was giving me the same error message, and i took your advise and change the temperature sender the light came off and for about 38 hours and now the other day. the light came back on again. i check the pcv valve and its dry and i blew through the hole and everything, that does not seem to be the problem. someone told me that i should change my O2 sensor and i was just wondering if anyone know what could be the problem and also if anyone had that issue. p.s. i have a 02 jetta 1.8t

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