To anyone with a properly-cooling V12 XJS:

Would someone mind please measuring the resistance of their XJS temp gauge sender when the car is warmed up and the gauge needle at the center of the N? The sender is located on the RH side of the engine, at the front, just behind the thermostat housing. It can be seen between the air filter box and the intake manifold. It has one wire with a spade lug connector at the top and it isn't too hard to get to.

With the car warmed up and shut off, you just measure the resistance from the spade lug on the sender to the engine block.

I need to know if my temperature gauge system is working properly before going to the trouble and expense of yanking the radiator.

Much appreciated,

Lou

 

My car's not running right now, so I can't measure it when warmed up. If you haven't already seen this, interesting reading...

http://www.efsowell.us/ed/jag/coolin...atureGauge.pdf

Ron

 

Thanks Ron! And thanks to the nuclear physicist who wrote this paper.

However, the contents gave me a sickening feeling.

Because of gauge worry, we pulled the radiator, also after seeing some hot/cold spots on the radiator with the IR gun.

The bottom 5" of the radiator DID look like some of its air fins were clogged with debris and muck, invisible until it was out of car.

But when the radiator shop opened the radiator, they found no significant blockage--and in their effort to rod it out, the core was damaged, so I had to re-core it.

After reading the 14-page article, it appears that I may have gauge problems after all! I'm going back to review my applied resistance notes.

I'll report more after the new radiator is installed.

Just as an aside, it is amazing to me how physically small the radiators on these cars are. They look a lot smaller when you take them out.