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07-07-2016, 08:48 PM
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#21
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Bus Crazy
Join Date: Apr 2010
Posts: 1,208
Year: 1999
Coachwork: Bluebird
Chassis: 3800 International
Engine: T444E
Rated Cap: 72
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my t444e has a electric clutch, comes on at 211 shuts of 204, its a called a Horton clutch, if you have the same you can unplug it and run 12volts to 1 wire, and ground the other, you will here the magnet snap and hold against the fan pulley, you wont be able to turn the fan by hand, take the power off the and the fan will free will, this will let you know the fan clutch is ok, and you may have a bad sensor or broken wire, I have a broken wire somewhere in my harness, and have been using a switch to turn my fan on and off.
my bus is 1999 t444e
gbstewart
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07-07-2016, 09:25 PM
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#22
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Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 18,830
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
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Quote:
Originally Posted by gbstewart
my t444e has a electric clutch, comes on at 211 shuts of 204, its a called a Horton clutch, if you have the same you can unplug it and run 12volts to 1 wire, and ground the other, you will here the magnet snap and hold against the fan pulley, you wont be able to turn the fan by hand, take the power off the and the fan will free will, this will let you know the fan clutch is ok, and you may have a bad sensor or broken wire, I have a broken wire somewhere in my harness, and have been using a switch to turn my fan on and off.
my bus is 1999 t444e
gbstewart
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thats an air electric horton... not all busses with the same engines have them... electric air fan clutchers were an option on most chassis.. the later the bus the more likely it is to have an air electric clutch standard...
depending on how the current fan is driven it may be possible to retrofit but its not cheap...
as for cooling a bus with an electric fan.. good luck.. the belt driven fans fully engage are somewhere in the 10000 CFM range from my calculations..
im not sure why the shop is charging the OP so much for a fan clutch even with labor... it took me an hour tops to put mine on...
the service book said I needed to remove cross-bars, coolan t hoses, etc to get the fan and clutch out...
I never took the fan out I separated the 2 on the bus and then just popped the clutch out...
-Christopher
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07-16-2016, 08:44 AM
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#23
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Bus Crazy
Join Date: Apr 2010
Posts: 1,208
Year: 1999
Coachwork: Bluebird
Chassis: 3800 International
Engine: T444E
Rated Cap: 72
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Quote:
Originally Posted by cadillackid
thats an air electric horton... not all busses with the same engines have them... electric air fan clutchers were an option on most chassis.. the later the bus the more likely it is to have an air electric clutch standard...
depending on how the current fan is driven it may be possible to retrofit but its not cheap...
as for cooling a bus with an electric fan.. good luck.. the belt driven fans fully engage are somewhere in the 10000 CFM range from my calculations..
im not sure why the shop is charging the OP so much for a fan clutch even with labor... it took me an hour tops to put mine on...
the service book said I needed to remove cross-bars, coolan t hoses, etc to get the fan and clutch out...
I never took the fan out I separated the 2 on the bus and then just popped the clutch out...
-Christopher
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do you have a Horton?, and if so where is the sensor that turns the clutch on? the Horton site was a bit helpful, but still not sure where it is, tks
gbstewart
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07-16-2016, 12:32 PM
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#24
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Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 18,830
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
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mine is a mechanical Viscous.. my service books talk about hortons (from 1990 / 1991).. but the T444E doesnt exist in my books.. I dont know if on an ECM controlled bus the fan clutch uses a separate inut sensor or is controlled by the computer..
in the early versions there was a sensor (2 wires) located on the radiator or near the water neck of the engine depending on the engine... again old stuff.. you will have a coolant temp sensor near the water neck thats for the dash gauge and computer.. you may find a separate one for the fan near there too...
-Christopher
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07-16-2016, 09:16 PM
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#25
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Bus Crazy
Join Date: Apr 2010
Posts: 1,208
Year: 1999
Coachwork: Bluebird
Chassis: 3800 International
Engine: T444E
Rated Cap: 72
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Quote:
Originally Posted by cadillackid
mine is a mechanical Viscous.. my service books talk about hortons (from 1990 / 1991).. but the T444E doesnt exist in my books.. I dont know if on an ECM controlled bus the fan clutch uses a separate inut sensor or is controlled by the computer..
in the early versions there was a sensor (2 wires) located on the radiator or near the water neck of the engine depending on the engine... again old stuff.. you will have a coolant temp sensor near the water neck thats for the dash gauge and computer.. you may find a separate one for the fan near there too...
-Christopher
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found my problem, a wire was slightly broken at the top of a connector to what I think is the temp sensor, I cut out the connector and replace it with a new one, when out for a drive, all is well, fan works like it should , no more using the manual switch 
gbstewart
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07-16-2016, 09:49 PM
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#26
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Bus Nut
Join Date: May 2016
Location: Richmond Virginia
Posts: 932
Year: 1984
Engine: 366 Big block Chevy! :) w/ Stick shift
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Nice! Glad to hear. Thanks for sharing the success. 
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07-17-2016, 09:38 AM
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#27
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Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 18,830
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
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ciongrats on the fix!! always feels great to make something.. even a little thing work good on our busses again!
-Christopher
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08-08-2016, 02:08 PM
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#28
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Mini-Skoolie
Join Date: Mar 2016
Location: Chino Valley AZ
Posts: 15
Year: 1991
Chassis: Bluebird
Engine: 8.3 L Cummins
Rated Cap: 84 passenger
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Check the clutch fan with a rolled up newspaper. See if it stops turning
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