I know you said the fluid is full and you're wondering why the first response told you to check the fluid. The answer is there is a very tight margin between full and not full. For example, if my coach is leaning just a little toward the reservoir hole, it will check full but it really is not. So, get on level ground to check.
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2004 Damon Escaper 4194 LX400
Freightliner XC Chassis,
Cummins ISL 400hp
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