How about making a few simple tests.... Check the flow and pressure to the heater core. Take the hoses off the heater core and point them into a bucket. See what kind of flow you have. Try plugging the inlet hose while it is running, and see if it is developing pressure. Right off the bat, this should tell you if it is a flow problem or a plugged heater core. This will isolate the problem to be either flow from the engine or a problem with the heater core.
Just having good flow does NOT insure that you will have good heat. I have seen cores that have had good flow going through them, and still would not deliver heat. After taking one of them apart, found that only a few tubes in the center of the core were flowing. Replacing the heater core solved that problem.
How about coolant temperature? MEASURE IT!!!! Do not trust a gauge. Put a thermometer into the radiator, and see for real what the temperature is running when it is warmed up.
While the system is a simple one, you cannot see inside of the system to see the problem. And, in this day and age, we are running vehicles long past what used to be called the end of life for a car or truck. In the old days, a car was shot around 100k miles. Today they are running 200 to 300 thousand miles. This brings about a whole host of new and unexpected problems.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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