For the last two winters in a row my heat has not worked it comes out just barely warmer than the outside temperature. I have gotten my heating core flushed out by a local radiator company, and it has slightly improved the temperature outbput, but it has never gotten back to what it was years ago. They tell me that there is some sort of junk in the radiator core, but I dont know what. I do have one of those engine block warmers (where you plug an electrical cable into the car), but never use it.
Can anyone figure out why this is happening?