Had my car at garage . It was flushed and refilled with coolant system flush . Ran for a day back re flushed and filled with new coolant no success. Contacted guy who used to work for Vauxhall he stripped out passenger side dashboard and replaced heat regulator. Ok for a couple of days then bam no heat . Been told this is a common problem. Thinking it’s time to offload the car . Any advice from members that have had this problem.