When l put the car away today l noticed a water trail into the garage. On closer inspection underneath it seems to be running out of the back of the engine onto the floor. Heater hose ??

 

Highly likely, yes. As long as it IS coolant and not aircon condensation, them probably one of:

• A bank to heater valve
• Heater valve itself
• Heater valve to firewall inlet spigot
• Outlet firewall spigot to metal return pipe.

 

Thanks Greg. Guessing not an easy job to do as everything will be in the way. The car is hissing at the back of the V area. but cant see the leak.

 

It was the righthand heater to vacuum switch pipe. Changed them all out to be sure. Very simple job...NOT !! That pipe was beating me up for a good while there until i beat it into submission. Only lost 1 screwdriver and 1 pipe clip to the V.

 

A rite of passage! I have lost countless 7mm 1/4 inch sockets doing that job!

 

What a good feeling to WIN!
Congrats!
(';')

 

Greg, If i want to fit the electric fan setup from Ebay. Just how much work is involved. Must the bonnet come off and the radiator come out ?

 

Assuming you mean the one with the shroud and fans all together?
The first thing is to remove the no longer required mechanical fan, it's boss and its tensioner, and also by doing so you save a drive belt. This can be done without removing anything else, but you might have to cut the belt, I cannot remember if it is the first second or third! Removing the power steering belt is a royal pain so cutting the belt, if needed, is a good option.
You will find, after the fan boss is removed, that the studs which are freed up and also hold part of the water pump, are not threaded down their whole length. So either get some spacers or thread the studs further down. I lazily used spacers (large nuts) and they have been there for 20 years!
Now the fan is out, you can undo the old shroud (fixings top and bottom). The ebay ad said the new unit uses the same fixings and drops straight in. The next thing is to decide how to control the fans. In my experience ALL the aftermarket stuff fails on the V12 in the XJS; but the good news is that Grant has a SUPERB control system that uses the OEM parts already on the car. This works reliably and properly.
In brief it works like this:
The new small fan replacing the OEM electric fan is wired to come on with the aircon condenser.
The big electric fan replacing the mechanical fan requires you to add a relay (use a 40 or even 70 amp relay as the current draw is big). The power side of the relay you wire to draw current from the firewall positive post. The relay is triggered by the OEM thermostatic switch in the water pump inlet. I take current from the coil 12v input to power the trigger side of the relay. I also installed a second cabin-switched circuit for the main fan, just as backup.
If you decide to go ahead, Grant has a diagram and so do I.

 

MAAAAAATE

Cut threads on those studs, and then cut off the excess threaded section.

Do it right, its a Jaguar for goodness sake, not some other inferior brand, HAHA.

Whatever rocks ya boat I say.