2001 E450 SD Vacuum check valve??
Hello...I have a 2001 Ford V10 E450 running my class C and just this weekend we were driving and notice the fan for AC or Heat or vent will go from dash air to defrost when the motor is under stress l...
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Is there a set of plans for this system? I have been looking around..I'm going to have to try and do this myself being that the dealer will want a ton for this.
