Over Heating ...

Strange thing the other week whilst laning and goign through some reasonably deep water ... Temp started to rise dispite having heaters on full.
Found out that pouring water over the heater worked ... May need to get a new radiator as this one has lots of damaged fins ...

Checked cooling system for leaks... nothing ... Will start by the radiator

could be worth checking how much mud there is stuck in the rad too, bent fins and mud are never a good mix.
Taking it out, good soak to loosen the mud or running a hose thro it to get out the worst of it a good start.

Yes, take it out and lay it in a tray of warm water (aka: the bath!)overnight, you will be shocked at the amount of mud that will come out of a "clean" radiator.

I would also guess that the viscous mechanism on the fan has given up. Get the engine really hot to the point of overheating, stop the engine and try to turn the fan by hand. If it turns its no good. I dismantled mine, put a piece of cardbord inide the mechanism to jam it on and then re-assembled. Now the fan is on full at all times but any sign over overheating has gone. Note that once you decide to open the viscous mechanism then there is no going back, its now bust even if it wasn't before you started as the oil escapes!

Martin

Im actually thinging to removign the fan all together next year and fitting an electric one. Also going to change the radiator and maybe fabricate a deflector to stop water directly flowing though it

update ... issue identified and resolved .... checked the fluid level ad it appeared to be fine. closer inspection revieled water pump is the offending item.

seems easy enough to change ..... well will start there !

Ok, this is starting to be a little wierd ... minus 5 degrees outside, good airflow though the radiator and temp pointing to the roof !!!...

I have usually experienced car heaters that will not heat the car due to sticking thermostats, and in cold weather even the bottom hose freezing resulting in lo heating inside, but yesterday, whilst out the jimny started to overheat again.
Heaters were blowing really hot to clear the condensation off the windows, the car was driving a mixture of cruising and having to use the power (in 4wd)

Im wondering if it even may be the heater matrix as I cannot see any lost water underneath the jeep when it is parked up ( and it was previously needing a coolant top-up.

Any ideas >