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I noticed after a few driving sessions following the installation of a new steering pump on my Humvee last weekend that the fan is always clutched in. This means that the fan changes speed with the motor. It also means the engine takes a long time to get up to operating temperature. It doesn't lend the system to over heating, of course, and yesterday no matter how I tried on the highway I was not able to get the coolant system temperature above 220. I was hoping getting above 220 might help reset the Cadillac valve and fan clutch controls. I did try unplugging the leads to the Cadillac valve cleaning them and plugging them back in. No apparent change. I did bleed the steering system according to the tech manual after the installation last weekend. I tried again yesterday but it made no change in fluid level. The fluid level appears stable at the proper mark. After careful loosening of all hose clamps I verified there is fluid in the supply and return lines at the Cadillac valve.
The fan is definitely clutch in because I can hear and see it change speeds with the motor. I tried to stop it carefully and definitely could not while the motor was running. The steering system is great. The wheels steer easier than ever before. And the steering wheel turns smoothly.
I followed the tech manual closely during the steering pump installation. The only thing we did that wasn't recommended was to remove the alternator so as to get at the steering pump more easily. We didn't touch or make any adjustments to the Cadillac valve or the fan or its clutch assembly.
I can't find anything in the tech manual about a stuck fan. The only conversations about that in the manual suggest bleeding the steering system or doing some kind of electronic checks regarding gauges and instrumentation.
I bled this system last weekend according to the tech manual. I drove the Humvee and then once it got up to temperature on the highway fan kicked in and I thought it also disengaged but by then I had pulled off to the side roads and was headed home. So I'm not certain. The next day it sounded like the fan was moving in time with the motor, which made me start checking on that
I searched but had trouble finding any information here on the site because the word fan is too common.
I wonder if anyone has had this problem and could give me any more ideas to try.
Thanks,
Bulldogger
The fan is definitely clutch in because I can hear and see it change speeds with the motor. I tried to stop it carefully and definitely could not while the motor was running. The steering system is great. The wheels steer easier than ever before. And the steering wheel turns smoothly.
I followed the tech manual closely during the steering pump installation. The only thing we did that wasn't recommended was to remove the alternator so as to get at the steering pump more easily. We didn't touch or make any adjustments to the Cadillac valve or the fan or its clutch assembly.
I can't find anything in the tech manual about a stuck fan. The only conversations about that in the manual suggest bleeding the steering system or doing some kind of electronic checks regarding gauges and instrumentation.
I bled this system last weekend according to the tech manual. I drove the Humvee and then once it got up to temperature on the highway fan kicked in and I thought it also disengaged but by then I had pulled off to the side roads and was headed home. So I'm not certain. The next day it sounded like the fan was moving in time with the motor, which made me start checking on that
I searched but had trouble finding any information here on the site because the word fan is too common.
I wonder if anyone has had this problem and could give me any more ideas to try.
Thanks,
Bulldogger