Frequent cracking the cylinder head Isuzu Trooper Allrad 2536 cc 85 kW (116 PS) EZ 10/1990 makes welding cracks and replacement head gasket! Which coolant to use to avoid the boiling point of the cooling system private off-road?
Cylnder head cracks only when overheating occurs and coolant alone is not the solution. You need to find out what is causing the overheating. If you have coolant losses, you need to rectify the leak, otherwise nothing is going to help.