05-17-2018, 11:39 AM
Gurus,
On the way home from the rally I noticed that my engine was running a few degrees warmer than usual. When I got home, I remembered to look at the radiator fan. It was not spinning. Hmmm. I called a fellow guru and he suggested that I unplug the relay for the hydraulic fan. (Located near radiator fan on bottom left looking towards the front of coach).
Today, when I did that test with engine running, the fan went from not turning at all to turning at full speed. Plugging the relay back turned the radiator fan off.
I then tested my dash AC that got fixed at the rally. Now my radiator fan ran at about half speed.
So far so good, but then something weird happened.
I turned the dash AC off, and expected the fan to turn off again. But it continued to run at the slow speed. Engine coolant temperature was not yet even warm (125F).
I turned the engine off, and then restarted. Now the fan turns at the slow speed.
Questions: Should it concern me that sometimes my radiator fan runs slowly and other times it does not run at all? Could this be a sign of a radiator hydraulic motor getting ready to fail?
Apparently the radiator fan motor has multiple speeds....what controls the speed? Clearly if I unplug the relay, it goes to full speed, but what tells it to run a slow speed?
Cheers,
bill
On the way home from the rally I noticed that my engine was running a few degrees warmer than usual. When I got home, I remembered to look at the radiator fan. It was not spinning. Hmmm. I called a fellow guru and he suggested that I unplug the relay for the hydraulic fan. (Located near radiator fan on bottom left looking towards the front of coach).
Today, when I did that test with engine running, the fan went from not turning at all to turning at full speed. Plugging the relay back turned the radiator fan off.
I then tested my dash AC that got fixed at the rally. Now my radiator fan ran at about half speed.
So far so good, but then something weird happened.
I turned the dash AC off, and expected the fan to turn off again. But it continued to run at the slow speed. Engine coolant temperature was not yet even warm (125F).
I turned the engine off, and then restarted. Now the fan turns at the slow speed.
Questions: Should it concern me that sometimes my radiator fan runs slowly and other times it does not run at all? Could this be a sign of a radiator hydraulic motor getting ready to fail?
Apparently the radiator fan motor has multiple speeds....what controls the speed? Clearly if I unplug the relay, it goes to full speed, but what tells it to run a slow speed?
Cheers,
bill
Bill Johnson
Birmingham, Alabama