Vehicle & Technical > Defender
running hot - help
bombx3:
try a new earth from the center holding nut
tjolliffe:
Just a thought...have you done the 'sniff test' to make sure the head gasket hasent gone? The smell of exahust fumes in the coolant will indicate a blown head gasket, equally any loss of coolant other than what would be expected normally could indicate a blow head gasket.
More often than not your local garage will do a head gasket test for next to nothing if you'r in any doubt. :)
Lawnmower:
my 2.5td is doing exactly this.
drained coolant, used rad cleaner stuff, changed thermostat and sender unit. reading is more stable, but sits on the edge of the white.
not sure what it is. would a dogy viscous fan produce these symptons, or a dodgy water pump.
(coolant didn't have any oil in, and engine oil is clean when it stays in there long enough).
TDi90:
yeah its odd!! lol~!
turbine:
Here is an unorthodox test. Partially drain the coolant.Put some food colorant into the top up water at the expansion tank. Run the motor to operating temp to ensure thermostat opens. Remove top rad hose first. Check the color of the fluid. This will tell you two things. whether or not the water is circulating; water pump. Or if you have a blocked rad core. Once you have established it's not a mechanical problem. You can move to the temp sender unit/electrics. You seemed to have covered all the other stuff. (I'd put my money on the electrical side)
I am not familiar with your engine. Is there a way to bleed the system whilst it's running. Can the thermostat housing be slightly cracked, or the sender unit, or anything else. Allowing you to bleed the system whilst the pump is running? An airlock would do much to prevent water flow aound the system. The obvious precaution is to run the motor with the surge tank cover off to prevent pressure build up. Also to not do so with hot coolant.
Hope you get sorted.
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