Is my coolant temp sender faulty?

[GazM]

I've had suspicions about it because the car idles lumpy sometimes, especially when cold, and other people here seem to have those symptoms with a faulty cts.

What's really made me think is I had vag-com plugged in this morning and at the end of my 1/2 hour trip to work the coolant temp reading from it was only in the mid to high 70's, when the temp guage on the instrument panel was reading 90.

Is this normal?

 

[mikecupra]

If there was a fault with the coolant sensor then vag-com should have recognised a fault code that was relevant to it i would have thought?

 

[traumapat]

be aware that lots of leons can suffer from lumpy surgy cold starts.. not saying yours is like this but id keep it at the back of your mind before shelling out on sensors etc. unless of course they report as faulty

 

[GazM]

Ok, thanks both. I just thought the reading after 30 mins driving was odd.

At least it doesn't have far to go to get to the back of my mind

 

[honeyman]

I had the coolant sensor play up on mine with the same problems as yours and it didn't throw up anything on Vag-com, I've since changed to the green sensor.

 

[GazM]

I had the coolant sensor play up on mine with the same problems as yours and it didn't throw up anything on Vag-com, I've since changed to the green sensor.

Did it fully stop the problems you were having?

 

[honeyman]

I'd say it was 80-90% better, as you know owning a turbo'd car it can change daily, but on the whole yes it was better, also no more annoying beeps first thing in the morning.

 

[driveforward]

The coolant temp sensor on our LC 20VT was causing a 'signal level too high' fault for quite a while. I cleared the code a number of times, but it kept returning and eventually caused a warning light to come on. Sensor has now been replaced, all is well again.

Ian

 

[GazM]

no more annoying beeps first thing in the morning.

I don't have any beeps, what are they ??

 

[honeyman]

Well if you don't change the sensor and wait till the cold mornings start then you'll get the three beeps and temp light flashing, but it tends not to do it in the summer months.