2013 cascadia will not reach operating temperature ISX/15

A/C system

 

There's 5 sensors associated with the ac system on an ISX. I changed 3 before I got the magic sensor.

They operate in a normally closed fashion. This allows a signal to go to your fan/clutch solenoid.

Take the lead off the sensor.

It's a plug. Two holes.

Take a piece of wire and insert it in the holes in the lead. You've now bridged the circuit.

Do this one by one until you're fan disengages.

That's your bad sensor.

Mine was the low pressure side at the compressor.

 

It won't matter. You have a sensor that's open.

That prevents you're solenoid from closing.

It could even be the solenoid, but doubtful.

 

Good luck. Could be a temp sensor. They're all that same two pin connector.

 

"turn off" the a/c high side pressure fan engage option with Insite and see if fan stays off. This is the easiest way to see if high side switch is bad. Sounds to me like the fan clutch is just "frozen". Build air to 120 lbs. Key off. Key back on, then take a piece of pipe and put one end on fan clutch and bang other end with hammer until it releases. If you want to do SCR test and diagnose fan issue later, just put a piece of cardboard in front of radiator before you test.

 

Solenoid on the fire wall