Hey all, Wondering if anyone has come across this issue, especially in a 458/488. Heater works intermittently (but mostly doesn't work). Will blow cold air for the most part, but sometimes will blow hot air, for a few minutes, then without touching anything will blow cold for the remainder of the drive. High rpms, low rpms, doesn't make a difference. My mechanic can't figure it out. Fluid levels are fine, no codes, aux water pump working, heater valves working. He was able to confirm supply tube drops the temp as well. Any thoughts or ideally someone who has had this issue? Thank you for any insights / advice. Pat
