Aircon intermittent T5 cali 2005, does anyone know the outside air temp sensors ?

[volksdennis]

Hello All,

Just became a member here as we have a 05 T5 California since June this year. Bought it with a non functioning climate control (due to faulty contrl unit/display) but this unit is replaced with OEM new unit and recoded. Aircon worked perfect during our first holiday in august. However I noted it started working intermittent during the last month. Now it only starts to cool after 1-2 hours of driving and switches of when there is no demand for aircon air and it does not start again for hours.

Took it back to aircon specialist to have it checked. Pressures good, new display good so he had it read out at VW dealer. All I got back was "there is some sensor reading minus 30 degrees, can be your ECU that failed to have this done this is going to be excpensive ". As this is sounding to me like goodluck and goodby I have decided to go and have this repaired myself.

Now I have checked the control unit with VCDS and noted all sensors in the Auto HVAC group read about 14-15 degrees except for one that reads minus 2.0 now. I do not know which sensor it is as I do not have the correct label file for this group. I have checked the sensor in the front bumper by heating it and this functions good both on the car display and in VCDS.

There must be more sensor(s) for outside air temp in the California, can someone tell me where they would be ?

PS: checked pumpc clutch and this is good

Thank you and regards,

Dennis

 

[WelshGas]

Hello All,

Just became a member here as we have a 05 T5 California since June this year. Bought it with a non functioning climate control (due to faulty contrl unit/display) but this unit is replaced with OEM new unit and recoded. Aircon worked perfect during our first holiday in august. However I noted it started working intermittent during the last month. Now it only starts to cool after 1-2 hours of driving and switches of when there is no demand for aircon air and it does not start again for hours.

Took it back to aircon specialist to have it checked. Pressures good, new display good so he had it read out at VW dealer. All I got back was "there is some sensor reading minus 30 degrees, can be your ECU that failed to have this done this is going to be excpensive ". As this is sounding to me like goodluck and goodby I have decided to go and have this repaired myself.

Now I have checked the control unit with VCDS and noted all sensors in the Auto HVAC group read about 14-15 degrees except for one that reads minus 2.0 now. I do not know which sensor it is as I do not have the correct label file for this group. I have checked the sensor in the front bumper by heating it and this functions good both on the car display and in VCDS.

There must be more sensor(s) for outside air temp in the California, can someone tell me where they would be ?

PS: checked pumpc clutch and this is good

Thank you and regards,

Dennis

This might help. Click on Campmobile. Select year and then the System.

Volkswagen Parts catalog - ETKA Online, Volkswagen EUROPA, original Catalog Volkswagen EUROPA

Parts catalog Volkswagen - ETKA Search Parts by original number Volkswagen, market EUROPA

volkswagen.7zap.com

 

[volksdennis]

Thank you !

Found the intake air sensor to be the faulty sensor and I have ordered a new hoping this will solve the aircon issue. There is however still one sensor reading a minus figure, i have checked and removed the second ambient sensor G249 under the kitchen but does not make a difference.

Can someone tell me if this sensor only connects to the camping equipment display or is also part of the canbus system ?

 

[WelshGas]

Thank you !

Found the intake air sensor to be the faulty sensor and I have ordered a new hoping this will solve the aircon issue. There is however still one sensor reading a minus figure, i have checked and removed the second ambient sensor G249 under the kitchen but does not make a difference.

Can someone tell me if this sensor only connects to the camping equipment display or is also part of the canbus system ?

I think it is the Camping side only.

 

[Alan Andrews]

Do you need to do a system reset within VCDS? Perhaps an Adaption reset?

I have not looked myself, but it might be worth investigating.

Could a faulty wire (to the sensor) cause a false reading? Might be worth tracing the wires back to rule this out.

Keep us posted on what you discover please.

 

[volksdennis]

I just picked up the new intake air sensor (G89) and installed it. Did a readout of all temp’s and all showed correct values. Engine started and started cooling direct. Happy camper here.

checked the sensor at rear axel again and found this is not a part of the canbus system, only for the camper display.

Thank you all for your input.