It's going to run hotter for few reasons all related to the fact that water is almost the best heat transfer fluid out there - same reasons why engines are water not air cooled.
Now, the physics of it:
Water specific heat of 4200J/C*kg compared to around 2500J/C*kg of waterless coolant - this means that to store the same amount of heat it will have to be 1.6x as hot.
Water thermal conductivity of around 0.6W/C*m compared to 0.3W/C*m - half of that of water which means that it takes more of a temperature difference to transfer same amount of heat in same amount of time.
Those two things above mean that water will absorb heat from the engine a lot faster, do it without heating up as much, and then dissipate it a lot faster - in case of a car with cooling system running at 100% capacity - it will overheat it very quickly.
However typical car has a lot of spare capacity in the cooling system so increase in temperature is not going to be as drastic.
With regards to engine temperatures - temperature gauge on 159 is beyond useless it will indicate 90C for any engine temperature between 70C-120C.
Numbers below are based on 2.4 JTDm - for 1.9 temperatures will probably be lower and therefore it might be ok in there.
Actual engine temperature will vary between 70-95C during normal use depending on a lot of condition - but in some cases it will go as high as just over 100C - cooling fan starts at 97C and goes to full speed at 102C - this is due to the fact the stat does not instantly open at 88C it takes a while for it to open and it happens over few degrees and also, due to the efficiency of the cooling system.
With 100C being about the maximum temperature that this engine gets up to under most conditions this leaves enough margin to start limiting power at 110C.
All operating temperatures will increase slightly - during normal driving it will probably be ok, but if you put any load on the engine it will go over 100C and probably over 110C - and therefore limit your power and also run the cooling fan all the time.
As i've mentioned above 1.9 has exactly the same cooling system as 2.4 so it has a lot more spare capacity so temperature increases in 1.9 will not be as high - but this is something that would have to be checked.
Another bad thing - after engine is stopped and therefore coolant circulation is stopped temperature will increase - with water based coolant - the coolant temperature can increase by 10-20C before it starts dropping back down (engine block and all other metal parts are always hotter than coolant), waterless coolant has 1.6x lower heat capacity so increase is going to be around 16-32C.
I'm not saying that the product itself is bad in any way - i'm saying that it does not perform exactly like water and provisions have to be made for it - it shouldn't be sold as a 100% compatible drop in replacement.
Also, very important in this case - viscosity of water at 25C is around 0.9cP, compared to around 16cP - 20x higher - this will mean that water pump is going to have to work a lot harder to pump it and those are very weak on JTD engines.
It's same thing as running diesel in petrol engine or the other way - both have their own properties and therefore cannot be exchanged without redesigning the engine.
Differences between waterless and water based coolant are not as significant as differences between petrol and diesel, but still have to be accounted for - this might mean a bigger radiator, water pump designed to work in a higher viscosity fluid and possibly bigger heat exchanging surfaces in the engine block and head.