Well, after my son drove the green '85 XJ6 for about a week, he calls me and says the battery is dead. What The @#!@ - that’s a brand new battery!, I’m thinking. I asked if he left the lights on, he said no. (yea right! I’m thinking) I went over to his place to see what was going on
The rest of the story
When I got to my Son’s house, Popped the bonnet (hood) and noticed coolant everywhere. F@%^! I’m thinking. I asked if the temp guage indicated it was hot or if the coolant light idot light came on; or if he could smell coolant; or if he needed to go to the doctor to have his sniffer tested?! He said no. A gallon of coolant and a fully charged batty later, I fired it up and took the car home, then I noticed the fan wouldn’t turn off. Oh, and he didn’t leave the lights on. The fan on the left side of the radiator (Federal cars Drivers Side) wouldn’t turn off. Even with the key out of the ignition. Hmm. didn’t come on when I hooked the battery back up. Weird. (I’m thinking)
As a test, I disconnected the ground and obviously the fan went off, and didn’t come back on when the battery was reconnected (to earth / ground). Hmmm… Ok?
Fired up the car, and the fan came on (again) air con / heater turned off. Engine off & key in my hand. Fan still on. Hmmm… Unpluged from the relay and plugged it back in - the fan stayed off. started the car again - fan came on turned the car off fan stayed on. OK… Cooked Relay…
I dug around in my Jag parts bin; found and replaced the relay, and well that didn’t fix it. So this tells me a thermostat / sensor that controls that fan has failed. The temp guage in the car reported correctly so this tels me it’s not the same thermostat that drives the fan relay. I haven’t looked at a wiring diagram yet, so I’m not sure what where the controlling sensor is located. I figured I’d throw this one out there incase someone else has had a similar problem; and may save me time finding a resolution.
Thank you in advance