ISC Fan Clutch Replacement $4000+ ?
Hey all, We have a 2009 Fleetwood Excursion 40x with a cummins ISC engine. Yesterday afternoon, while driving down into Sedona on I-17, our serpentine belt snapped. As it snapped, it broke the wi...
Forum Discussion
usersmanual wrote:11178adm wrote:
if the fan never turns off you may have a problem with the a/c high pressure curcuit, it could be a switch or wiring issue
no
Actually there's some truth to that statement.
This from cummins (linklink):
With the A/C Vehicle Speed Control feature option enabled, if the fan is operating due to A/C pressure input, it will disengage in the follow manner:
Below 6 mph: At vehicle speeds of less than 6 mph, once activated, the fan will continue to run until the vehicle speed exceeds 6 mph. or the engine is shut down.
Between 6 and 30 mph: If the vehicle is traveling between 6 and 30 mph and the fan is activated, it will disengage after it has run for at least the length of time defined by the Fan Control A/C Pressure Switch Timer parameter.
Above 30 mph: At vehicle speeds above 30 mph the fan will disengage as soon as the pressure switch no longer indicates a need for fan cooling. Subsequent input from the pressure switch will cause the fan to activate and deactivate as necessary.
