I've got a 2B engine in a BJ44. I added a direct read temp gauge after replacing water pump, radiator, and tstat. No matter how hard or long I run even in summer, temperature doesn't go above 160. This means the tstat never opens. When I bought it, there was no tstat. Am I correct in assuming my heat will not work if the tstat is not open? I guess the good news is my engine cooling system works great.