My XJS V12 Overheating ANY TIPS?
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My XJS V12 Overheating ANY TIPS? - 5/14/2007 6:21:17 PM
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a
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 Hi everybody
I just got me an 1988 XJS V12 Jag convertible. Love the car but I hate the problems.
Onerheats more often than not. I replace the thermostats and still does it. I could drive 50 miles on the highway and works OK, I drive 3 miles on the street to Church and the gage goes all the way to the top.
Did anyone encounter same problem?
What to do?
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V12Jager
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RE: My XJS V12 Overheating ANY TIPS? - 5/15/2007 10:41:51 AM
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Jose
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the 12-cylinder engine is a hot-running engine to begin with, so if you've changed thermostats, did you install one that opens at a lower temperature? (that depends on your local climate too, but your thermostat may be stuck-closed, or opening at a higher temp than desired).
does your car have an Auxiliary Electric Fan or two?, (in front of the radiator?), Is it coming ON when the gauge reaches a certain temperature? If not, the auxiliary fan Relay, Fuse, or Thermo-Switch (if applicable) may be bad. I am guessing here because I am not familiar with the particular model, but the 12-cylinder engine since the 1970's has a pair of electric "air-pusher" Fans which came wired from the factory to come ON and stay ON as long as the A/C compressor is ON. In other words, they should run as soon as you turn the climate control to ON. Compare that to the XJ-6 which has a Thermo-Switch to control the temperature at which the Auxiliary Fan comes ON.
All the above assumes your Cylinder Head Gasket is good, and that you have the required mix and quantity of coolant & water in the system. A product called "Water-Wetter" might help with lowering the temp, you just add it to the coolant/water mix. It is used in race cars. Whenever topping up the coolant, start with a COLD engine, turn the Heater ON to maximum temperature so that the Heater Valve opens when the engine reaches operating temp and allows coolant to fill the Heater system too.
And last: is the Water Pump good? No leaking through the "weep hole" ?
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RE: My XJS V12 Overheating ANY TIPS? - 5/15/2007 11:10:21 AM
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bigdreams05
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Also, under the car there might be a plastic piece that takes air coming in from under the car and makes it hit the engine. If that piece of plastic isn't there, then the air keeps going under the car instead of to the engine! Just my 2 cents. It happened to my dads car, so just food for thought!
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"Haven't I told you "A MILLION" times NOT to exaggerate"
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RE: My XJS V12 Overheating ANY TIPS? - 7/30/2007 11:11:53 PM
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rschaller
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if your guage is pegging, either it is reading wrong, or you are in real danger of dropping a valve guide or worse.
the v12 used in the xjs has one small PULLER fan (drivers side) and a large thermocoupled fan, puller also, unless your setup was modified.
is your system topped up? is the elec. fan working when ac on or at high temp?
how old is radiator, and is there a bunch of debris clogging it?
you have alot of investigating to do, before it's too late.
i replaced my radiator, added a twin puller electric fan setup, mounted separate transmission oil cooler with small fan, use about 3 bottles water wetter, and it works fine in so. cal.
you may have bought alot of previous trouble with the car, but if it isn't too late, try all remedies!
cheers! robert
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