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Okay so here in Michigan the temps have been close or below zero for most of the month. My issue is that sometimes my heat will not work. What happens is when the truck warms up fine to operating temperature, I turn on the heat and cold air blows out. What I have done to try and fix this is back flush the heater core. Which did help because when the heat does work the air is a lot hotter than before. There was quite a bit of crud in there. What I assume now is that: 1) I am not getting enough vaccum to open the main air flow gate which either lets ambient air or heated air through. 2) The main gate is frozen somehow 3) vaccum leak somewhere...? After the temperatures outside increase a little and the inside of the truck warms up a bit, the heat works fine. It is only when the mornings are arctic cold. Am I right with my assumtions or is there anything else I should check?
