leecharlton

Hi can anyone help me i recently had a head gasket replaced had a few probs with car since due to thermosat going and getting a big air lock in the water system but this is all sorted now i was out in it the other day and i give it some all threw the gears looked down at my temp gauge and it was almost near the red so i let my foot of the peedle and temp started to go down straight away iv drive the car in traffic and left runnin for a long time and it hasnt over heated once has anyone got any idea what could cause this problem:wonder