Based on your last couple of posts, I'm leaning more and more to it being a valve problem. I'm guessing you have the "multifunction" valve behind your convenience center wall. There are several posts about O-rings slipping or tearing and causing various problems. Nobody has complained of what you're experiencing, but with what you've posted in the last 2 posts, I'm thinking it's the valve that's causing your problems.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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