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Thanks for the response. I started with the IWE check valve once I heard the system trying to engage and that seemed to work until it came back but as I mentioned it would take it very long periods of driving to get it to start. I bought an extended warranty so at that point I took it to the...

I’m having issues with my 2018 Raptor also trying to engage 4wd drive but it’s only after the vehicle is driven 50 plus miles and gets hot! It will not do it until engine temp gets up and then it constantly tries to engage! I’ve changed the check valve, vacuum canister, lower owe hoses and the...