engine getting quite hot after not a lot of use

right then, ive got a 90 with a 2.8 izuzu engine and i have recently just finished doing all the modifications i wanted on it like paint etc. and so i have just got it back on the road, but i have noticed that over around 20/30mins driving it starts to get quite hot with the temp gauge going just into red and the rad top hose is quite hot. so just wondering what could be the problem, possibly some thing to do with the thermostat ? any help would be much apreciated. mat.

is radiator

Might someone know better on an Isuzu forum?

thought i might try here first as its got a landrover rad

Did it run cooler before you did any of the work?
The LR rad should be more than adequate for the zuzu engine.

Water pump knackered or thermostat stuck closed most likely problems

i bought it about a year ago and then did all the work on it, but it hasn't done more than about 10 miles in that time and i havn't done anything that would affect the rad or anything majorly mechanical, il have a look at the thermostat and see what shes like.