PT Engine Cooling Fan System

[Rick A.]

Thanks Pete,
But I'm looking for a little more specific information. Like the actual
valve which controls
the hydraulic fan systems low speed... and likewise for the high speed? There is
a Webster
Pressure Relief Valve in this system which has a solenoid? No hydraulic shop
here can find
any information on it, as Webster has been gone awhile. Bluebird parts says
they no
longer stock it and they do not have service kits for it?

Rick Archie
85PT40
Fort Worth...where it has not rained for 2 days...

--- In WanderlodgeForum@yahoogroups.com, Pete Masterson wrote:
>
> 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?
>
>
>
> [Non-text portions of this message have been removed]
>