Hi, I'm a new member so be gentle with me My granddaughter's Grande Punto's heater doesn't warm up. Nothing to do with the internal fan. I've fixed that. She recently had a new water pump fitted so the likelyhood is that there is an air lokk in the system. Any tips on bleeding the system, in particular,the system. Any help would be appreciated to save me going around the houses. She erxpects me to fix things in 5 minutes LOL. Cheers and thanks in advance. Michael