Quote:
Originally Posted by jay_bob
Yes the fan always runs at least on low speed unless you push the 0 button.
Chapter 83-600 in the FSM explains it all including the location and function of the vacuum pods.
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this seems to run on low when the "o" is selected 
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83 300CD- sanden, dual p/f condensers, 160a alternator, ect
91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect
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