Didn’t think this topic warranted a new thread so I’ll ask here.
I’m trying to remember why I had to do this to my truck but I know it was pertinent. Around beginning of the warm months I did a heater core flush, which was kind of a pain since I couldn’t seem to get the new fluids to circulate afterward. After more back and forth flushing everything seemed to have returned to normal until this morning driving to the shop. Normally once I’m on the highway, even in freezing temps like this morning, I keep the heat at level 1 fan on floor and defrost and it’s always gotten very toasty. Today I kept it at 2 the whole way and was still a little chilly. Eventually parked and switched to “face” vent selection and the air coming out was barely warm, very unusual. Engine temp is right at where it’s been for the past 13 years, not sure if I ever replaced the t-stat.
I’m thinking I might need to do another heater core flush but don’t know if it’s worth trying. Any ideas? I really liked my heat the way it used to be and it wasn’t that cold this morning, only 31*.