Outer Limits 4x4 Board

My wifes Disco has been overheating sometimes lately. The coolant levels are correct. She rang me on the way to work today saying it was doing it again and I said to turn the heater on which helped and brought it back to normal. She was driving with the Aircon on and was on the highway.

Now I dont know where to start in looking at why its doing it. I am thinking maybe putting a new thermostat into it?

She I maybe get the heads checked?

Any help appreciated, its our only car.

Had a similar problem last year so I know there are a number of possible causes.
The top of the engine is above the cooling system which is pressurised to force the water to the top so even if the coolant level is OK it may not be reaching the top. Could try parking it uphill with the engine warm, wait till it cools a bit, then add extra water to coolant.
Is your radiator OK? May need flushing.
Thermostat could be stuffed.
Viscous fan could be broken and not operating. This was my problem and cost me several hundred to get fixed but since then its run perfectly with the needle on about 30%.
Suggest you find a Land Rover specialist as a Toyota/Nissan mechanic may not have the foggiest about anything not made in Japan.
What part of the country are you in?

that uphill idea i did on our driveway, put more in but problem has come back. do you know any landy specialists in brisbane

bein that turning the heater on lowered the temperature my first point of call would be to get the radiator properly flushed out.

Ok will get some stuff to flush it out tomorrow and see how that goes first off.

jimmyb wrote:Ok will get some stuff to flush it out tomorrow and see how that goes first off.

Generally these need flushing profesionally. By removing the radiator and haveing the cores rodded out which involves removing the tanks from the cores.

Would it be worth running a solution through it to try and clean myself first?

jimmyb wrote:Would it be worth running a solution through it to try and clean myself first?

No get it rodded, check that the clutch fan is working correctly and replace the thermostat and hoses whilst your there

ok flushed radiator today, checked thermo and its working. re fitted and all flowing. still overheats when the heater is not running. Is rodding going to be worth it and how much should it cost?

jimmyb wrote:ok flushed radiator today, checked thermo and its working. re fitted and all flowing. still overheats when the heater is not running. Is rodding going to be worth it and how much should it cost?

As others have said, the tanks have to be removed and the cores rodded out. Because it is a cross flow radiator and the tanks are on the side.

Flushing works with radiators the that have top and bottom tanks, because sediment drops out in the bottom tank.

In a cross flow radiator, the sediment drops out in the lower cores. When the lower cores block, the coolant flow bypasses them.

Well radiator mob rekon it fooked. So need to source new or 2nd hand radiator