Temp Gauge acting weird???

[Silver B6 S4]

2004 Audi S4 6-speed, 33,800 miles on the odo...

Sometimes it doesn't work, sometimes it will be in the middle, then drop to cold while driving. Drive for 30 minutes, still shows cold. Turn off car, start back up, and it shows the temp in the middle of the gauge? I don't know where to start with this problem. Is it bad to keep driving the car like this?

[s42k5b]

Thermostat or Coolant temp sensor

[Silver B6 S4]

^^^ Thats a good start, I will try that first.


I have found on another forum, that it was the gauge itself. That person said replacing the gauge in the cluster fixed the problem.

[zbrock06]

coolant temp sensor.

[NorCal1.8T]

coolant temp sensor for sure

[Silver B6 S4]

Thanks for the help guys, I will replace the sensor tomarrow.

Alex

[nimski62]

Thanks for the help guys, I will replace the sensor tomarrow.

Alex

I have same problem now. Did replacing the CTS fix your problem?

[Silver B6 S4]

I never got around to installing the sensor... It's in a tight spot behind the engine. When I tried to install it 2 weeks ago, I couldn't find it. I will try again this weekend when I install my exhaust.

[ZONAWILDCATS4]

I tried to replace my coolant temp sensor and gave up. Its on the back of the engine at about 12 o'clock and has a clip that secures it in place. Its in an awkward spot, you might be able to get it out, but putting back on would be a task. I'm sure there are people out there who have done it, but it isn't as easy as it looks. I would also recommend that you get an extra clip cuz many people drop them while trying to remove them or reinstall.

[Silver B6 S4]

Funny you mention getting a new clip... It costs more than the sensor...$40.

[chaos2984]

its located on top of the trans behind the motor. alldata says 1.4 to replace sensor. Cant be that dificult to replace. but im sure you deff want to motor cold to do this

[Silver B6 S4]

Well, I replaced the sensor on Saturday. What a B***c that was, took me almost 5 hours. It DID NOT FIX THE PROBLEM... The wiring looked good, and so did the sensor I replaced...

I found this thread about replacing the gauge inside the cluster.

http://www.audi-forums.com/b6-forum/...at-issues.html


I've searched, and can't find a replacment gauge on the internet. Anyone know where to find this? Buying a used cluster seems cheaper, if Audi doesn't charge me an arm,leg, and firstborn to adapt it to the car...


Alex

[nimski62]

You should be able to adapt it with that handy vagcom cable and a few write ups. I'll be curious to know if THAT fixes your problem, because I have this same exact damn problem, and also same miles. weird

[ZONAWILDCATS4]

If that didn't help, I would next look at the thermostat before you start looking at the replacing the gauge. Its probably cheaper than a new gauge.

[Silver B6 S4]

If that didn't help, I would next look at the thermostat before you start looking at the replacing the gauge. Its probably cheaper than a new gauge.

I thought about that, but I don't see how that would affect the gauge? Yesterday, I drove the car for 30 minutes. The gauge never went above the quarter mark. I shut the car off for 10 minutes, started it back up, and the gauge was at the half-way mark. It stayed there the rest of the drive home.

[nimski62]

I thought about that, but I don't see how that would affect the gauge? Yesterday, I drove the car for 30 minutes. The gauge never went above the quarter mark. I shut the car off for 10 minutes, started it back up, and the gauge was at the half-way mark. It stayed there the rest of the drive home.

Cant get anymore exact. same shit happening here! turn key on and off, and its back to normal.

[PetrolDave]

Instrument voltage regulator...

[04v8s4]

Yup...i have the same issue with the coolant temp gauge. Seems like the temp sensor is a PITA to change.

[Silver B6 S4]

Instrument voltage regulator...

Anyone know where this is located?

Alex

[Silver B6 S4]

^^^^ Any help???

[Silver B6 S4]

Still have this problem...


Vag-Com says:

Performance Malfunction in Cooling System.


I don't know what to look for? HELP!

Alex

[Silver B6 S4]

I got these codes in my car:

Address 01: Engine

19497- Powertrain Databus: Implausible Engine Temp. Message from Inst. Panel
P3041-004- No Signal/Communication- Intermittent

18010- Power Supply Terminal 30: Voltage too low
P1602-002- Lower Limit Exceeded- Intermittent

18613- Performance Malfunction in Cooling System
P2181-008- Implausible Signal- MIL ON


Address 17: Instruments

01039- Coolant Temperature Sensor(G2)
30-10- Open or Short to Plus- Intermittent

[Silver B6 S4]

Post 12:

Well, I replaced the sensor on Saturday. What a B***c that was, took me almost 5 hours. It DID NOT FIX THE PROBLEM... The wiring looked good, and so did the sensor I replaced...

I found this thread about replacing the gauge inside the cluster.

http://www.audi-forums.com/b6-forum/...at-issues.html


I've searched, and can't find a replacment gauge on the internet. Anyone know where to find this? Buying a used cluster seems cheaper, if Audi doesn't charge me an arm,leg, and firstborn to adapt it to the car...


Alex

[tatarin]

have you changed the thermostat

[mad70sx]

Sometimes it doesn't work, sometimes it will be in the middle, then drop to cold while driving. Drive for 30 minutes, still shows cold. Turn off car, start back up, and it shows the temp in the middle of the gauge

Cant get anymore exact. same shit happening here! turn key on and off, and its back to normal.

I am also having the very same problem. My CEL light came on from it. Here is what I got on my VAG scan.

18613 - Performance Malfunction in Cooling System P2181 - 008 - Implausible Signal

The coolant level is fine and the car runs normally. It's off to the dealership soon,hopefully to be repaired under warranty.

[Silver B6 S4]

I haven't changed the thermostat yet. I have been following this thread:

http://www.audizine.com/forum/showthread.php?t=269661


Seems like replacing the alternator is the fix.