What to use to clean tires

[antique405@...]

On my 83 the fan is controlled with air pressure and i put a bypass in. The reason the solenoid id energized is because air pressure keeps the fan off so if you loose air pressure the fan will be on. Don't know if yours is the same but probably is.

Paul Downey

Versailles Ky

In a message dated 8/15/2010 12:47:32 A.M. Eastern Daylight Time, waynekotila@... writes:

Hi Fred:

How can you tell it comes on going down the road?

I have been trying to figure how it works in order to determine if it works, and or what could be wrong with it.What I have discovered is that the the dash switch for the fan override controls a relay and the relay controls a 12 volt solenoid on a hydraulic valve body mounted just below and to the side of the hydraulic motor that turns the radiator fan. What really surprised me is that this 12 volt solenoid is energized when the ignition is on and the dash switch for fan override is off, when you turn the fan override switch on the solenoid is de-energized. So all the time your engine is running and the switch is off the solenoid is powered, so that would be most of the time. There has to be a return spring of some kind in the hydraulic valve body to return the valve spool back to it's original position after the solenoid de-energizes, so ifthe fan override doesn't work it may be aweak or badspring not returning the valve spool to it's original position. I was told by Holland Motor homes that turning that dash switch on anytime should make the fan kick into high speed.

The automatic fan speed control is accomplished with a non electric thermostatic switch that is locatedon top ofone of the coolant lines and controls the flow of hydraulic fluid to the valve body.This type of thermostatic switch is supposed to be very reliable and Holland told me that they have never seen a problem with one, and even if the 12 volt fan override controlled with the switch on the dash isn't working the automatic systemshould be operating normally.

Wayne

96PT42

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From: Fred Hulse
To: WanderlodgeForum@yahoogroups.com
Sent: Sat, August 14, 2010 10:38:57 PM
Subject: Re: [WanderlodgeForum] What to use to clean tires



Hi Wayne

I have not been able to make the fan come on sitting in the driveway,but I do know I can switch it on when running down the road,I am not certain enough to say for sure,but I think it is wired through the computer.

Not positive.

Fred Hulse
Morristown,Arizona
97 WLWB41