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From : delhelt

Q: the vacuum should decrease when you accelerate uphill. so your a/c - heat damper door is going toward the hot coil when you lose vacuum. sounds like maybe your dash switch is not working to block the vacuum from the damper door when you select heat. i have a 99 dakota v8 5.2l auto trans air cond club cab. i thought i noticed this late into last winter and im certain i can detect it now the mornings just recently turned are cold where i live. the heat output used to be excellent usually the heater put out so much heat that id have to turn it down after a driving for 10 to 15 minutes but now i detect that the heat is somewhat marginal i.e. not what it used to be. i also notice that the amount of heat noticeably increases with engine vacuum such as when i heavily accelerate going up a hill i get lots of heat and when the hill stops or i take my foot off the gas the heat output lessens. when im driving on a level road such as an interstate highway at 65 mph there is just adequate heat but not anywhere as much as there used to be. note that im not referring to the volume of air the fan pushes out the volume does not vary im referring to how hot the air is that the fan pushes out. i suspect theres a leak in a vacuum line that controls the hot-air/outside-air mixture. but im lost as to where to look ... i donut see any of the black rubber vacuum hoses 1/8 going from the engine/manifold into the cab. nor do i know where to look under the dashboard assembly. any help pointing me in the right direction will be appreciated such as where might i find drawings of how to access the heater/blower assembly the air mix door etc. .