So wondered if you guys could help me narrow down my problems.

 

My car doesn't seem to show that it is up to temp on the dash gauge however the heaters blow hot pretty fast.

 

I was thinking maybe thermostat but when my old mk1 cupra r had the thermostat go bad the temp on the gauge would drop when i went on the motorway and warm back up when stood still however it seems completely random on my vRS

 

I also looked on vagcom at the coolant temp and after the car was sat for around 3 hours the coolant temp was flickering between 12.6C and 13.4C, the ambient temp was 13.4C

 

Does this help show a dodgy sensor?

 

any help with what it could be or some further test to be carried out would be great.

Edited 19 November, 20187 yr by Connorg115

@Connorg115 - It could just be the gauge channel on the CTS.

3 minutes ago, KenONeill said:

@Connorg115 - It could just be the gauge channel on the CTS.

So replace CTS and go from there?

32 minutes ago, Connorg115 said:

I also looked on vagcom at the coolant temp and after the car was sat for around 3 hours the coolant temp was flickering between 12.6C and 13.4C, the ambient temp was 13.4C

 

What does it show when the engine is at operating temperature?

 

@KenONeill there is only one channel on a Fabia CTS.

Just now, Wino said:

 

What does it show when the engine is at operating temperature?

 

@KenONeill there is only one channel on a Fabia CTS.

Haven't had chance to check yet, i just plugged the laptop in when i was on break at work.

 

What should i look for?

Something near 90°C if the car has had a decent run.

1 minute ago, Wino said:

Something near 90°C if the car has had a decent run.

okay thank you, I will whip out the laptop tomorrow before work:)

So plugged the laptop in after a 13 mile drive, temp was at 70.4C and slowly dropped when I pulled up, heater was turned off 

 

does this show thermostat problems? 

Just now, Connorg115 said:

So plugged the laptop in after a 13 mile drive, temp was at 70.4C and slowly dropped when I pulled up, heater was turned off 

 

does this show thermostat problems? 

 

Either that or a sensor.

The temp gauge on my vRS wouldn't show above approx 75, and drop to 50 when aircon was on, it turned out to be the temp sensor.

My local good guy garage put a voltmeter on sensor and thermostat to see which one was faulty.

mine does this, it will show 0 then show 70 then 90 and go up and down all day long. it's the sensor that needs changing.