1.9TDi AVF Engine engine coolant temperature dash vs climate

[bluezie]

I plugged in my OBD2 scanner this evening and went for a drive. The live data display on the scanner matched almost perfectly the temperature gauge on the dash. The ambient temperature was much warmer today than it was a few days ago when it took 30 mins to reach 90 degrees. This evening it took just over 20. I watched the OBD and dash climb steadily in unison.
Channel 51 on the climate control readout is totally out though - it shows 127 when the dash and OBD show almost 90.

Can someone please confirm that channel 51 is the correct one to use and that their CC diagnostics mode matches (or at least, resembles) the dash gauge?

Thanks

But which ECU did you log into? Engine or instruments? You need to log into both and compare readings. The gauge on the dash is very approximate, damped and weighted to stay at 90 degrees over quite a large temperature variation. The diagnostics will show the exact temperature if the sensors are working fine.

[sram]

But which ECU did you log into? Engine or instruments?.

Ah. With a generic scanner, is there an option? I certainly couldn't see the option on mine.

[bluezie]

Ah. With a generic scanner, is there an option? I certainly couldn't see the option on mine.

This is why I always say get a full registered VCDS! They work properly at every level that is possible with diagnostics. I't s best tool you will ever buy if serious about maintaining your car.
What is channel 51, and on what are you reading the figures? 127 degrees sounds like the refrigerant gas max temperature after leaving the compressor before it enters the condenser radiator.
On VCDS, auto HVAC is address 08. All temperatures etc are within the 'measuring blocks' after logging into 08

[Rob69]

20 minutes is still a very long time to reach operating temeprature, I've heard and read that non genuine thermostats can give poor results. I was surprised that my old stat seemed to behave as expected in a pan of hot water but a new genuine stat drastically improved warm up times and running temperature. i can only think the original stat had got sluggish with age.