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Heater Controls only work when 4wd switch is set to 4wd

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Old Dec 1, 2007 | 10:20 PM
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mrkevin
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Heater Controls only work when 4wd switch is set to 4wd

It only blows out the defrost until i switch to 4wd, then i can switch back to 2wd and it will work for a while then go back to defrost.

It is a 2000 4 door, 4x4, v-10, auto, the v-10 went bad and was replaced with a 5.4
 
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Old Dec 1, 2007 | 10:26 PM
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Think that is all symptoms of a vacuum leak.
 
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Old Dec 1, 2007 | 10:29 PM
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mrkevin
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thats what i figured, i was hoping that when the engine change was done they hadnt put any lines in the wrong place, does anyone have a good procedures list for tracking the leak down, and diagrams of the vacuum system.
 
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