01 Montero overheating @ idle. On my BMW this is indicative of a faulty fan clutch. Is it the same for my montero?

Could be. I think that the fan clutch is a viscous coupling type so if the fluid has leaked out it will no longer work. Try giving it a spin and see if it is very free or noisey.

When was the last time you flushed your coolant?

Jim

Actually its a Thermostatic Spring Viscous bearing type. The more the front thermo loaded spring heats up it tightens on the Viscous bearing causing less free run of the bearing , ultimatlly increasing the speed of the fan with the engines revolution , pulling more air thru the radiator , cooling down the coolant. As the air flowing thru the radiator drops in temp and the thermostatic frunt hub and loaded spring retract allowing more free spin of the fan against the viscous bearing. Yu can sorta tell by , with the engine off turn the fan by hand and see how freely it spins , it should have some resistance , also when fully cold , have sumone start the vehicle and observe the fan , at start up yu should hear the fan draw alot of air and then ease up . And as the vehicle warms up in idle in one position yu should audibly hear the fan increase in velocity . Stop the vehicle , if the fan spins a bit that is a sign that the fan clutch is not working correctlly.

But as mentioned coolant and radiator flushes are a very important thing to get done. A low flow , by restricted radiator passages in the radiator can cause cooling issues.

Good answer, I learn something new every day. Most of the time it is just something simple which is wrong. Start on the basics and work your way from there.

Jim

So right , my cousins gf father has an older Pajero and he was have cooling issues. He did everythin except the obvious. He changed the radiator etc and asked meeh if i think he should get a bigger radiator. He said on drives it cooled fine but stop and go traffic and in town . I asked did he ever check his fan clutch , apparentlly he did not know of how it functioned, i went and checked it and he changed it and problem solved. he was at lost of words for sumthing that he was having issues with for almost a year that turned to be simple LoL