Thinking about doing THIS!

[junglejuice]

Yes I run twin electric fans (but I ditched the mechanical fan) but so does my Commodore.
My twin electric fan set up pulls less air then the stock mechanical fan does so it's down to more airflow, I also still run my trans through the radiator, fully stock in those regards.
I spent over an hour yesterday idling along on the bruce h'way due to horrible traffic, AC on, towing a 1t camper trailer, temps never changed from normal 90ish...

My t/stat is at least 13yrs old as it was in the car when I bought it, I replaced it with a new one (Tridon) but it was erratic so I just refitted the original (OEM) unit...

Just a thought, have you actually tested the performance of your temps sensor accurately to verify it's reading correctly???

[alexbrown64]

Originally Posted by LuluBelle

I will try anything as I want to go offroad

I can't say if all my work on the cooling system has worked yet, as i have yet to get the XJ engineered and passed pits.
But here is the work i have done in the hope of beating the overheating blues (as it did overheat on the beach).

Runcool hood louvers.
Replaced cracked headers with new ceramic coated headers.
High flow water pump.
New 195f thermostat, cover and gasket.
New Stant rad cap.
New 3 row ally radiator.
All new hoses, including heater hoses.
Triple electric fans with shroud from dirt bound offroad.
Derale tranny cooler with fan bypassing rad.
70/30 coolant mix.
6 out of 7 welch plugs replaced with brass.
Pressure tested system (and found leaks) (loose hoses).

I believe that most of the above, if faulty, could contribute to overheating.
Check your exhaust for cracks (increases underhood temps, mine was cracked), make sure you have a good thermostat (mine was fcuked), and get in there with a blue light to check for leaks... and make a cheap pressure tester like i did... i put it up on a separate thread. As others mention, the whole system must be good. I thought my old rad was good, but when i took it out, it was weeping from two spots. My old water pump bearing was also really stiff.

Cheers,

[LuluBelle]

Originally Posted by junglejuice

Just a thought, have you actually tested the performance of your temps sensor accurately to verify it's reading correctly???

good idea will have to look into that

[junglejuice]

Originally Posted by LuluBelle

no good idea will have to look into that

The FSM shows the readings that the sensor should give, get hold of a thermometer suitable to go to at least 100*C, suspend the sensor so the probe portion is in a pot of water with your multimeter connected to it to read OHMS, with your thermometer also in the water heat the water and take notes of the readings both temp and resistance, this will tell you if it's reading correctly.
You can also test the guage by fitting a resistor from the wire that connects to the sensor and grounding the other side of the resistor, using the chart in the FSM you can work out what values to use.
These tests will at least verify whether or not your looking at "actual" temperature or not.

Also remember the temp sensor is at the rear of the head....

[LuluBelle]

sounds a bit complex the vents are in the mail now I might just replace the sender for a new one I may as well as I have replaced everything else so vents and a new sender at the same time

lets hope its easy to get to

[junglejuice]

Originally Posted by LuluBelle

sounds a bit complex the vents are in the mail now I might just replace the sender for a new one I may as well as I have replaced everything else so vents and a new sender at the same time

lets hope its easy to get to

Well the thing is until you actually know what's happening you could be just replacing things for no reason, ok if you're rich I guess...

[Richard buttocks]

Originally Posted by junglejuice

Well the thing is until you actually know what's happening you could be just replacing things for no reason, ok if you're rich I guess...

Owns an XJ

Rich?

BAHAHAHAHAHA