Intermittent Heat Help -1965 Imperial Crown

Ambush

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I have for your consideration an always frustrating problem ...The Intermittent problem. Had some work done on my heat/Ac system...specifically the heat function. The heater core had to be serviced ( re-cored ), the slider temp control cable re-attached ( and tested), and a couple new hoses. The heat was working and blowing warm when I pick up the car. Later in the week I drove the car, and initially the heat worked, blowing warm air. But soon the air tuned cold ..or maybe not cold, but just not hot anymore. It became warm again but only for a short time before it went cold. It mainly stays cold, or Not warm. So my heat works sometimes blowing warm ...but most of the time it doesn't'. The antifreeze in the radiator is up at a good level. The slider temp control is connected and opening/closing the door. There is not leak apparent.

SO could the heater control valve be the culprit here? If that part was not working correctly, could it cause an intermittent issue w/ the heat not staying hot?
*A side note: On the occasion the heat was working, it never seem to ever get really HOT, just warm ( even w/ the door fully open ).

Anyway let me now if the valve is worth replacing ...will it solve my prob? And if so where can one find that part?

1965 Imperial Crown w/ factory A/C. Thanks!
 
Coolant is at proper level. What's the "burping" procedure ... where do I pat it :)
 
Check that the hoses are routed properly regarding water flow direction. I think the problem might be cause because the water is flowing through the water valve in the wrong direction. The cooling section in your service manual should show the flow direction in the hoses and which one hooks up to which pipe on the valve.
 
Check that the hoses are routed properly regarding water flow direction. I think the problem might be cause because the water is flowing through the water valve in the wrong direction. The cooling section in your service manual should show the flow direction in the hoses and which one hooks up to which pipe on the valve.
That would be the first thing I would check.
 
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