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  1. #1
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    Erratic temp gauge...

    Hi all, got a problem......
    Temp gauge reads 90deg while driving, few mins later its bottomed out on 50deg, keep driving and its 90 again, then 50!!!!
    Temp keeps falling off, can anyone help me diagnose this please?!

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  3. #2
    marktdisport's Avatar
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    Get it scanned but I'd say coolant temp sensor is your fault
    A4 TDI 130 SPORT..
    now sold but still in the family, gone back in time to the cupra R again..

  4. #3
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    I started with coolant temp sensor, doesnt seem to have fixed it, im going to change thermostat next,
    Mods done: interior: Light to dark conversion, To Do: Carbon trim, carpet to be replaced, rear window retrofit. Exterior: Resprayed in Skoda's Rallye Green, 18" RS4 reps fitted, xenons, LED sidelights/NumberPlate lights, B Pillars wrapped in carbon. To Do: Lowering 35mm all round, tints, Tuning: Yet to do exhaust/remap/ egr delete etc..


  5. #4
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    Did scan it, came up with 18062 - check memory of innstrument cluster. ??? Im thinking cts but need some reasurance from people with similar faults!
    bit worried about my fault code, should i just clear it?

  6. #5
    marktdisport's Avatar
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    Quote Originally Posted by Dan TheMan Welburn View Post
    I started with coolant temp sensor, doesnt seem to have fixed it, im going to change thermostat next,
    my reason for cts in this case is the erratic up/down is more electrical fault thermostats gentally open and close and slightly being stuck open stopping the gauge reading 90 this makes the gauge slowly to move 60/90 etc
    A4 TDI 130 SPORT..
    now sold but still in the family, gone back in time to the cupra R again..

  7. #6
    marktdisport's Avatar
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    Quote Originally Posted by Jp-tqs View Post
    Did scan it, came up with 18062 - check memory of innstrument cluster. ??? Im thinking cts but need some reasurance from people with similar faults!
    bit worried about my fault code, should i just clear it?
    yes clear the fault !! Then if it comes back fix it.....
    A4 TDI 130 SPORT..
    now sold but still in the family, gone back in time to the cupra R again..

  8. #7
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    Think (hope!) you might be right, car gets to operating temp on gauge but just falls off! So def electrical not mechanical. What else is in the system? Stat, cts.... Anything else?!

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    Quote Originally Posted by marktdisport View Post
    my reason for cts in this case is the erratic up/down is more electrical fault thermostats gentally open and close and slightly being stuck open stopping the gauge reading 90 this makes the gauge slowly to move 60/90 etc
    yeah i understand your logic, i should of done stat first anyway as mine struggles to get to 90 always hovers between 60 and 90 and takes an age to get there, if id of used basic logic first id of sorted it first time suppose you live and learn though
    Mods done: interior: Light to dark conversion, To Do: Carbon trim, carpet to be replaced, rear window retrofit. Exterior: Resprayed in Skoda's Rallye Green, 18" RS4 reps fitted, xenons, LED sidelights/NumberPlate lights, B Pillars wrapped in carbon. To Do: Lowering 35mm all round, tints, Tuning: Yet to do exhaust/remap/ egr delete etc..


  10. #9
    marktdisport's Avatar
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    Just these 2 items and both are very prown to failure, read so many threads about temp gauges in the last month it's untrue
    A4 TDI 130 SPORT..
    now sold but still in the family, gone back in time to the cupra R again..

  11. #10
    marktdisport's Avatar
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    Quote Originally Posted by Dan TheMan Welburn View Post
    yeah i understand your logic, i should of done stat first anyway as mine struggles to get to 90 always hovers between 60 and 90 and takes an age to get there, if id of used basic logic first id of sorted it first time suppose you live and learn though
    yes m8 the one tell tail sign you've said above is it takes ages to get to 90 which suggests its slightly stuck open, a stat will sort you out bud
    A4 TDI 130 SPORT..
    now sold but still in the family, gone back in time to the cupra R again..

  12. #11
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    Can the gauge be faulty?

  13. #12
    marktdisport's Avatar
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    Quote Originally Posted by Jp-tqs View Post
    Can the gauge be faulty?
    my opinion never say never......but IMO i wouldn't consider that yet
    A4 TDI 130 SPORT..
    now sold but still in the family, gone back in time to the cupra R again..

  14. #13
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    Can you get genuine coolant temp sensors online? Or is it a dealer trip?

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    I usually get all my VAG parts from TPS, always a bit cheaper than the dealer.
    A4 Avant B6 1.9 TDI 130 Sport (6) Moro Pearl Blue, GMBH S Line Kit, Decat, 165bhp remap, EGR delete, K&N panel, Dunlop SP Sport Max, Full Leather, Cruise Control, Full DIS, Bose, Audi phone prep, Cooled Glove Box, Rear privacy glass, Rear parking assist.
    2003 Seat Ibiza 1.2 TSI FR in Lima green.

  16. #15
    marktdisport's Avatar
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    Quote Originally Posted by Jp-tqs View Post
    Can you get genuine coolant temp sensors online? Or is it a dealer trip?
    ive read a few horrow stories that people have changed cts and thermostat by cheaper versions and they still have faults after I would say buy at tps or stealers or of any vag specialist, I'd get both changed for piece of mind, the better it runs on 90 the better your mpg return will be
    A4 TDI 130 SPORT..
    now sold but still in the family, gone back in time to the cupra R again..

  17. #16
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    Been at work today so couldnt get to audi parts dept, do tps do online delivery? Want to get this sorted ready for a remap! Need it running right first though.

  18. #17
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    Am i right in thinking that cts is in the centre of this pic with the 2 wires on it? Just under the pipe with the vw/audi logo on it (rear of the cylinder head).

 

 

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