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Old 02-03-2015, 09:08 PM   #1
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Join Date: Jul 2013
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2004 Mandalay Cat 350 radiator CAC cleaning to solve over heating issue

I decided It was time to dive in and fix my overheating problem. Even though the issue was usually only during climbing long grades it was annoying and just not right. Once I cut the cowl open I knew right away it probably was the right choice. As you can see in the first pic the radiator was,blocked pretty much the top 1/4 of the radiator half way on the driver side. I used a combination of heavy duty simple green, dawn soap and engine cleaner mixed in a small garden sprayer. Used very hot water at about 1/2 diluted. I sprayed the area as much as possible let it set for 20 minutes then sprayed it down with a garden hose sprayer. Be careful not to damage the fins with very high pressure. I did this twice because I wasn't happy with a couple areas but when done most everything came off and all the fins were clear. I ensured all the residue cleaning solvents were flushed off everything before closing up the top. Make sure the water runs clean out the bottom of the radiator at the back of the MH. I took the MH out on the road to ensure everything was blown out. Although I haven't taken it on high grades yet the temps seem to be lower. I will take it to Ely NV this weekend and give it a good test. Hope the pics help.
Click image for larger version

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ID:	85117. Cut the radiator cowl big enough so I cold get my hand or any spray equipment in between the CAC and radiator. Click image for larger version

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ID:	85118 cut a piece of aircraft aluminum 020 . This will be used to form the lip on the cowl and hold the original piece cut out. Click image for larger version

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ID:	85119 I used nut plates riveted in place for each screw so that the door can be removed easily in the future. Click image for larger version

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ID:	85120 once all the nut plates were riveted in place I match drilled the plate back on the cowl then pop riveted the plate to the cowl. Click image for larger version

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ID:	85121Click image for larger version

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ID:	85122 then just screwed the door back in to the plate.

Richard Glick
Delta , Utah

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Old 02-04-2015, 08:46 AM   #2
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Remember to extend the breather tube to the rear of the coach, past the radiator, and much of the oil and resulting grime will be greatly reduced.

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Old 02-04-2015, 03:51 PM   #3
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I've only had the MH for a year and there is an extension on the tube which takes it up to and over the side to side road flap. Sometimes the tube ends up behind the flap so I wonder if that is still not far reward still. Thoughts?
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Old 02-04-2015, 04:42 PM   #4
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Thanks for sharing. That is a good idea.

2013 FleetWood Expedition 38B
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cat, heating, radiator

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