Incorrect outside temperature reading

[CTScott]

Originally Posted by JudgeM

CTscott you are spot on. I disconnected the AC ecu and it read correctly !

So my question is now, can I just cut the thermistor wire that goes into the AC ECU and connect it to my meter instead ? I dont have the fancy climate control in my car, just the normal manual AC controls so I am thinking that the AC ecu doesn't really need to know the outside ambient temp.

The manual AC ECU does want the ambient temperature input as well. I believe it uses it to determine the duty cycle for the compressor to avoid freezing the evaporator when running it for defogging in colder temperatures.

You can try it though as see how the AC works. Another option would be to connect a fixed value resistor to the AC ECU pin and fool it with a constant outside temp value.

[ojeysky]

Originally Posted by CTScott

Another option would be to connect a fixed value resistor to the AC ECU pin and fool it with a constant outside temp value.

Hello CTScott this is what happens in my case, i do not have the ambient sensor on but my scanner constantly reads that ambient temp is 81C, i wonder if 81 is a good value to have optimal coolness in the car. Outside temp is normally between 35 and 45C

[ojeysky]

Hello CTscot,

I got the sensor at Amazon (did a vehicle fit check on Amazon which passed before I ordered it) find attached picture but it doesn't seem to fit.
Is it possible that I am looking at the wrong place for the sensor?

Regards