95 cavalier overheating

i just got it and the guy put a new pump, head gasket, plugs, and plug wires. the problem is it still overheats. i drove it 15 miles home an it was almost to the redline. what should i do?
by the way its a 95 z24 with a 5speed.
thank you.

thermostat try that.

thanks, looked at it last saturday. seems to be the temp sending unit because the needle was way up to 260 one day and the fluid in the resevoir wasnt that warm. hoping to change that tomorrow night/sat morning and see if that fixes it. if not then on to the thermostat.

sounds good