Ok, I have been ridiculed for my posts about replacing heater cores in these cars, so after replacing Greybeasts core I cut it in half to show you all. There are many small tubes with spiral brass restrictors in each tube. He didn't have heat, even at like 3000rpm there was only luke warm air. I replaced his core and now he enjoys 118 degree heat at idle and 155 at a steady 2000rpm cruise. His coolant was like new. I had the waterpump out when I did the TB, and it was the same color and stength as the new I put in. When the core was cut and the restrictors pulled out they were caked with brown goo, mostly at the top of the core. This is why flushing either just moves it around or lodges it tighter. You may see some heat, but it is usually short lived. I am not posting this to be a smart ass, I am only clueing people in on what they are dealing with. Now for the pics:
Note the crud on the left side of the pic below, this is what is clinging to the brass restrictors.
Some of the pics are not that good but you get the idea........enjoy.