Climatronic problems

[mea02mr]

Hi, have a climatronic problem which would appreciate some help with.

My car appears to heat up as normal reaching 90 on the dash board in a normal time and does not deviate from this in any sort of driving conditions.

However in the climatronic diagnostic menu, the engine coolant reading stays around 25 and because of this the climatronic system is not turning the fan on in automatic mode and i am not getting any heat from the vents.

Here is the strange bit, monitoring it whilst someone else is driving i have noticed that when turning right the coolant temp on the diagnostic menu of climatronic briefly goes up and the fan comes on and i get heat. As soon as the car is going straight again the temp drops fan slows down and i loose heat.

Any suggestions?? i have tried draining the system several times and refilling with no joy.
Does any body know where the cliimatronic gets the coolant temp from?

 

[LEE69]

Yeah it gets it from the CTS

This will enlighten you

http://www.seatcupra.net/forums/showthread.php?t=243117&highlight=temperature

 

[mea02mr]

Thanks,

but if the climatronic gets its engine coolant temp from the CTS where does the temp gauge on the dash get its reading from? they are about 70 degrees different on my car at the moment. is there more than one sensor?

 

[techie]

There is more than one sensor, however its the same thing.

Confused? The gauge and ECUs work off two different sensors, they are however buit into the same unit hence four pins.

 

[mea02mr]

Oh ok, so the one probe has two sensors in it? one for the ecu and dash and one for the climatronic. So even though the dash gauge is reading ok and the car is running ok the same probe could be causing the climatronic to go wrong?

 

[mea02mr]

sorry taking a bit for me to understand this :-s

 

[LEE69]

The climatronic gets it from the ECU which gets it from a side of the CTS for the sake of £10 (of ebay) be fine to try it

 

[techie]

Yeah basically.

Hpwever im not 100% on the MBVs for the climatronic but not all relate exactly to a figure as such. So whatever figure you have it may not be a temperature.

And as far as I know there is no direct ling between the coolant temp sensor and the a/c system, I think you have a different fault tbh.

 

[mea02mr]

Thanks i will give it a go! The code i am reading from is 51c and the values it displays do seem to make sense as the coolant temperature.

As the fault occurred 4 months ago and then fixed its self i noted down all the values of the codes when it was working, and during that stage the climatronic coolant temp matched the temp on the dash when starting from cold and watching them both rise to 90 and stabilize. It’s just now, with the fault, the climatronic one doesn’t rise with the dash temp and the fan and the heater are not working because of this. unless i go round a corner then the climatronic temp temporarily rises and the fan kicks into life and i get some heat.

Maybe i should just weave down the road. lol

 

[techie]

So do you get heat in manual mode?

 

[mea02mr]

No can manually set the fan speed ok but no heat. could that mean the heater matrix is not getting fed properly or is blocked aswell as a dodgy temp sensor?