PT Engine Cooling Fan System

[Leroy Eckert]

There is an Alarmstat control that actuates a hydraulic valve that controls fan
speed. Full on or Idle. All factory Alarmstats I have seen are 195 degree and in
the absence of the fan override or chassis air being on the water temperature
gauge should cycle between 200 and 190 degrees.
The hydraulics of the fan partially bypass when in idle mode and full on in high
mode. The reservoir is the big black tank on the road side of the engine bay. It
is also the reservoir for the power steering system. Don't forget it has three
filters inside.
I changed my Alarmstat to 190 degrees and run lower temperatures now. It is
manufactured by Medallion Instruments and is available from BB. It is located in
the water jacket near the water pump adjacent to the water temp sender. It has
two wires.
I have an electrical drawing for the fan circuit for a 1990. I imagine all
would be the same since I doubt BB reinvented the system each year. I do not
have a schematic of the valve.
Leroy Eckert
1990 WB-40"Smoke N Mirrors"
Niceville, FL
Royale Conversion
----- Original Message -----
From: Rick A.
To: WanderlodgeForum@yahoogroups.com
Sent: Sunday, August 05, 2007 9:11 PM
Subject: [WanderlodgeForum] PT Engine Cooling Fan System


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?

thanks,
Rick Archie
85PT40
Fort Worth





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