89 ka24e overheating.

[blues14]

I bought a low km used ka24e and had it installed in place of the original motor which had a blown headgasket. The problem i am having is the motor gets really hot and the coolant starts bubbling into the overflow container. also the upperradiator hose gets really firm(a lot of pressure) the car gets up to temp really fast as well. but according to the gauge, the car never gets overheated. the needle stays in the middle of C and H. if i shut the car off and restart it, the temp reads higher, but goes back down to the middle in a minute of driving. is my car overheating or what? It has new hoses and a new thermostat.

[navysnail]

do a compression test, bleed the coolant system (search will bring the procedure up, its been discused before)