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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Just wanted to see if anyone is having my original problem from this thread. I have tried everything but what grinder suggested since that might be to advanced for me. Hate to go to deal I know they will want a ton of money!!
