Member Since: 11 Mar 2009
Location: Somerset
Posts: 3551
Air con temp sensor wiring
Hi i need to pick your brains, thought i would get my air con serviced today,all went well until we run it up at the end .The problem is when running the air con the high pressure side raises in pressure,which is good but when it reaches around the 15 mark on the gauge the fan should cut in,but its not,i take it this is what the electrical side of the viscous fan is for.So the sensor on the high pressure pipe on the right of the engine bay is that the temp one to switch the fan on, if so can this be linked out to turn the fan on to make sure that side of the circuit is working ok or what voltage i should be seeing on the 3 wires.
cheers Wanted D4s non runners pm for competitive price.
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I've done some more research and it sounds highly likely that there is something in the system that will cause the fan to operate to force air through the condensor if the refrigerant gets too hot. However, I don't know enough about the system to say what that might be Now an ex-D3 owner after 7 happy years. Miss the car but not the big bills
17th Jun 2010 8:29 am
woody32 Site Sponsor
Member Since: 11 Mar 2009
Location: Somerset
Posts: 3551
-No worries i have ordered a new sensor which goes into the high pressure line, just need to know which wire controls the fan from that sensor, so looks like the multimeter's coming out again unless someone has a wiring diagram they would like to share with me.Wanted D4s non runners pm for competitive price.
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Mobile or workshop,PM for details.
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.The problem is when running the air con the high pressure side raises in pressure,which is good but when it reaches around the 15 mark on the gauge the fan should cut in,but its not,i take it this is what the electrical side of the viscous fan is for.So the sensor on the high pressure pipe on the right of the engine bay is that the temp one to switch the fan on, if so can this be linked out to turn the fan on to make sure that side of the circuit is working ok or what voltage i should be seeing on the 3 wires.
I very much doubt the viscous fan has anything to do with the aircon 
-No worries i have ordered a new sensor which goes into the high pressure line, just need to know which wire controls the fan from that sensor, so looks like the multimeter's coming out again unless someone has a wiring diagram they would like to share with me.
