help neede please smoke and other things
 

hi all ive just got a pajero. i need a bit of help please, it seems its smoking from the exhaust when parked up also i found out thats its leaking steaming hot water out of the resivoir. i did refill it, but when doing so it seems there was just water in it instead of a mix of coolant i replenished it and seemed ok until it started to smoke out of the back. maybe i think it may of over heated but not sure. any help would be ever so great. thanks

pajero k reg auto 2.5td