ok car is a 90 s13 with an s14 twincam

parts that have been replaced:

new mech temp gauge
new headgasket
new fal fan
new water pump
new resivour
new radiator cap

ok so today I bled the system with the engine at operating temp tightened the bleeder screw back down and put the radiator cap back on. drove the car around my nieborhood for about 20 mins came back parked it and let it idle for about 30 mins while I installed a new cd player...the entire drive and for the 30 mins it was idling it stayed at 190 or below. So Im thinking great it just needed to be bled. I start it up about an hour later while Im tuning the speakers and cd player i just put in and it stays right at 190 the whole time. now I just went for a drive I get two blocks from my house and it shoots up to 230 and is climbing towards 260 so I get it back to the house and its at 230 and sitting there. now the temp gauge on the cluster is about halfway so I don't know if 230 is a dangerous temp to drive around on but it seems high to me. Its not leaking any coolant and its not low the resivour has coolant in it. The car has been doing this since I got it anyone have any idea what it could be?