1/2 ton to 3/4 ton suspension swap?
#21
#23
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you should maybe look into your heater box. i know mine was pretty full when i bought it and just yesterday i bulled about 3 hand fulls of leafs and debris. i also manually closed the heater door that controls temp all the way closed and it seemed to make a huge difference today. about a 1cm gap was the difference between warm and hot air.
#25
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it is in the heater box. the temperature control lever controls how much the door opens or closes to allow cool air into the box. i always find the levers have a bit of spring to them and that is usually the doors not moving all the way. there should be an access panel on the passenger side of the heater box. it is probably full with years worth of leaf and debris.
#26
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Trouble shooting needs specificity. In my mind there is a difference between a lack of heat, a lack of air volume/flow, and a lack of control over direction of flow. They each point to a different problem and therefore a different solution. Leaves and debris cause a lack of air flow and therefore a lack of heat but both symptoms are present with blockage. A lack of heat with good air flow indicates poor hot water flow or too cool water. Doors not closing completely will lead to air flow from non-designated vents. These things can all be present at the same time, especially with the age of our trucks, but any time there is a problem it should be broken down to specific symptoms as best you can.
#27