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F438921

2005 Monaco Dynasty cooling fan module repair.

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When I bought my coach I noticed the cooling fan kept cutting in and out randomly and found that if I wiggled the harness going into the cooling fan control module it would cut in and out, so I thought maybe a broken wire inside the insulation but that wasn't it, I found the problem was inside the module and when I checked the price of it I almost croaked so I thought I have to try and repair it. I first went at it from the underside and cut out the hard rubber that was poured in to protect the module circuit board and to keep people like me out. I could see the loose wire in the circuit board but wasn't able to solder it from this side, so I thought ok I know where the failed spot is, so I turned it over and very carefully drilled a large hole through the aluminum case and could plainly see the loose wire in the circuit board. I then proceeded to solder it in properly and then filled the hole in with (right stuff gasket maker/silicone) and after it hardened I plugged it in and it worked fine and has for three years now. I just thought I had to share this to try and help someone else out as I believe its probably a pattern failure problem. 

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A sole mate !  Love it, a walk on the wild side.  Like I have mentioned. When something is broken - hard to do to much damage. 

Cold solder connections can be caused when circuit boards are still to cold, when they are passed through a wave soldering station.  They pass the test station only to fail at some point in the future. Often referred to as Monday morning boards. Some went to piece work and would never fail.

      I have spent over 50 years working in electronics - RND, Manufacturing, Testing, Field work and environmental. Couple  that with the curiosity of a 5 year old - makes for an interesting journey through life.

     Ok, if I copy you handy work and put on file ?

Rich.

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Engine cooling fan right? Took NASA soldering course at Redstone Arsenal as part of my Nike training. I always felt like there insistence on perfection was worthwhile.

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I had a part time job in High School, 10 hours on Sat.  Did the circuit boards, before and after soldering!  Little company in Santa Monica, CA. called Radar Relay..very controlled temp, before/after.

Rich, it was a block from Rand Corp. 😁

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