Hi All, New to the forum having just purchased a non running Pre HE XJ-S. After a week of replacing fuel lines, leaking fuel pump, 2 new fuel pressure regulators and refurbishing the AAV, I know have a purring happy Jag.
However, the heater doesn’t seem to operate, control do nothing. I have checked the fuse and that’s good. What would be the next thing to check? relays?
Well a bit of an update. I broke down due to an open circuit ballast resistor, possibly be caused by my alternator failing a few miles earlier and running at 17 volts. I replaced the regulator in the Lucas alternator and the ballast, then noticed some pin holes and water leaking from the bottom of my header tank. A new one arrived today and the car is now driving again.
I was about to start work on the issue with the fans not working and then they suddenly came to life. Could it have been air in the cooling system? I’m not sure if the water temperature sensor by the heater would disable the fans if it wasn’t being heated.