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Power Strokes
6.4 Tech
No heat at idle.
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[QUOTE="Gary, post: 939652, member: 675"] I'd try chemically cleaning the heater core, I do it often on all makes of vehicles. I have been using CLR with good luck, I'm gonna try VC9 on the next one. Just remove the heat hoses from the engine, then flush with a garden hose both ways, then I blow the water out, add the cleaner let it sit for a hour, flush with the garden hose, put the hoses back on and your done. I've done this on 100's of vehicles over the years and don't ever remember it NOT working, 6.0's and GM dex-cool vehicles are the most popular, I wrench for a living. [/QUOTE]
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