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Welcome to the forums!!
We need details of your problem, otherwise all we can do is guess; like_ is your engine running and up to operating temperature? Now that's silly, but an example of how a lack of details effects replies.
The details include but is not limited to; is the heater hose hot where it enters the heat exchanger box? Is it hot where the heater hose exits the box? Does the fan run and blow air through the ducts?
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2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA. "We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln
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