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Old 09-18-2011, 07:42 PM   #1
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does anyone know what would cause the front heater fan speed to slow down after going over 50 mph and speed up when slowing down i have a 03 travel supreme....thanks pk42

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Old 09-19-2011, 12:24 AM   #2
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OK, now thats a little on the strange side. A few questions if I may. Is this a new problem , or are you new to the coach ? If you run the A/C on recirc, do you get the same issue ? As the fan speed drops do you see any change in the voltage gauge ? When the fan is running does it operate smoothly; no vibration/noise.?
Possible that air -flow around the coach at speed is pulling air away from the heater fresh air inlet, if the problem is not apparent in recirc, then that could be it.

99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
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Old 09-19-2011, 07:43 PM   #3
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the coach i have had 1 year and i noticed it going south last winter,and getting ready to leave in afew weeks,so i have not had a chance to try it this summer.But it did not make a noise or viberate it just started blowing more hot air when slowing down but i did not mess with the recerc.air but that is an interesting solution i will defintely try that...pk42 thanks
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Old 09-19-2011, 10:37 PM   #4
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A vehicle with a gasoline engine could experience this problem if it has a small vacuum leak developing. When you ease up on the gas pedal the engine develops more vacuum and the heater and air conditioning valves and doors operate as they should. When you accelerate to higher speed a vacuum reservoir tank supplies vacuum unless a leak is present. If you have a gasoline engine, a simple vacuum test may help to show a leak.
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Old 09-20-2011, 08:43 AM   #5
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the coach is 350 hp cummings on a 38 ft. sparten chassis travel supreme....thanks pk42
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