Coolant temp gets to 100 when driving, will probably get hotter but don't want to risk driving it. When stationary it's fine from startup, fan kicks in and temp drops. However after a drive I need to stick the heaters on full for the temp to drop, the rad fan doesnt help.Thermostat is working have removed and tested it. Have also tried the car without the stat in place, however the problem is still there.. It's a used forged engine, runs smooth, no spoke or loss of coolant, waterpump is brand new from camskill.. Using a dual core ally civic rad. Faulty water pump? Headgasket issue?