PT Engine Cooling Fan System

[Pete Masterson]

There's a thermostat somewhere... however, the fan goes to 'high'
when (1) the dash switch "fan Override" is on and (2) whenever the
chassis AC is on.

When the switch is off and the AC is off, then the thermostat (where
ever it is) controls the fan speed. On my coach, I can't ever tell
when the fan is off or running on low speed -- unless I'm standing
outside. I can tell when the fan is on 'high' if I'm parked or moving
over dusty (unpaved) ground as the high speed really kicks up the dust.

So, unless you want the fan on high all the time, leave the fan
override switch "off" and don't turn on the chassis AC. Then, the
thermostatically controlled switch (back in the engine compartment
somewhere) will control the fan speed. (On my coach, the fan is
powered hydraulically.)

Pete Masterson
'95 Blue Bird Wanderlodge WBDA 42
El Sobrante CA
aeonix1@...



On Aug 5, 2007, at 7:11 PM, Rick A. wrote:

> Has anyone figured out how the PT engine cooling fan system
> actually changes from low
> speed to high? Obviously there is a fan override switch on the dash
> and a temperature
> controlled switch on the engine which when activated turns the fan
> on high. Question is,
> what do they really turn on? or off?



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