I HAVE A 1999 Jaguar XJ8 4.0 Automatic.AND IT OVERHEATS WHILE DRIVING,ONCE I TURN THE A/C ON THE TEMP. GOES DOWN I AM THINKING THAT IT COULD BE THE COOLANT TEMPERATURE SENSOR BUT I AM NOT SURE ALSO I GOT CODE P1111 WHICH MEANS INTAKE AIR TEMP.
ANY SUGESTIONS,THANK YOU ALL.

 

Welcome, our pundit helpful friends will get more help for your problem ,Otherwise you can check out Jaguar XJ8 - XJR Forums or post your inquiry for faster responses

 

P1111 is normal....it seems that your fans aren't coming on when they should. When you turn on the A/C the fans must be coming on, that's why the engine is cooling with the A/C on. I think you're on the right track with the sensor. Check for loose wires or corrosion on the connections at the sensor.

 

Welcome to the forum jfangel, I hope that you can get things sorted over in the tech sections.

 

Thank You for the advise I will check the wiring and also will check for corrossion at the sensor Merry Christmas.

 

welcome to the site In the meantime I've upgraded you too Full forum access so you can better view the sites features

 

Welcome to the forum.