I have a 2001 Ex 7.3 Limited 4 X 4 with 185,000 miles. Last year 4 WD on front hubs went out so had new hubs & seals. New vacuum pump also. Now getting intermittent problem with A/C damper only blowing defrost which indicates vacuum problem. I think 4 WD goes in and out also.
Local mechanic replaced vacuum lines but can't find the problem, suggested dealer take a look.
Does anyone have any thoughts as to what might be causing problem before the dealer goes to town on it? I can check simple suggestions but mechanical ability is limited to opening the hood!!!
Have researchd the site but nothing seems to help.
would appreciate any help so I can have "educated" conversation with the dealer - thanks