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once I saw Ronmar find a solution then followed by CMC shortly there after.. I did the same aftermarket install... 1 years ago a zillions of cycles... zero issues... I think Sean Filner was the last human on the planet to have purchasesd an OEM (Burkhart?) from overseas !

I whole heartedly disagree with Ronmar overly simplistic "diagnosis" .. it's either the Fetzer Valve or Muffler Bearing ..and you'll need a 2 way adjustable tent wrench to fix it....touche' Ronmar... (insert mic drop)

and if your fan soleniod is not working and needs to be replaced...they are very difficult to find..MME has crap shoot soleniods for ..wait.. wait.. $300.. but since most of us rather not get hosed by MME , there is an alternative from The Mad LMTV Scientist himself Ronmar...it's 1/10 the cost...

2 simple tests... before you start up the truck.. see if the fan spins freely with your hand...it should not second, when your truck is aired up and you hit the kill switch, you should hear it purge...if not , it might be shot or needs to be cleaned..here is a video from Dave and Sean....