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 - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
... [Read Article]
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