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Old 04-25-2016, 09:45 PM   #1
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What all engines does this "Wax valve" fit??

I am not able to locate any information on a new thermo valve 199 degree (wax valve) I know it fits C15 Cats but wondered if it will fit anyother diesel? Part number is 553109857210. Thanks in advance for any help guys.

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Old 04-26-2016, 07:46 AM   #2
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I just replace my Thermovalve last year using this part #

B5531-09857-210

which appears to the same part number you listed. Here is a link to on that is listed at Northwest RV Supply

Sauer Danfoss Thermal Valve: nwrvsupply.com

I bought mine from Whitehouse Products in the UK, paid ~$265 with shipping and exchange rate. Once ordered it took ~1 week to be delivered.

This valve is used on some Monaco coaches with side radiator, I own a 2002 Windsor with a Cummins 350ISC 8.3L
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Old 04-26-2016, 08:19 AM   #3
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Why do motor homes use a wax valve and hydraulic drive for side radiator cooling fans? Wouldn't a thermal switch and a two-speed electric fan be simpler and more reliable?
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Old 04-26-2016, 08:21 AM   #4
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Quote:
Originally Posted by barmcd View Post
Why do motor homes use a wax valve and hydraulic drive for side radiator cooling fans? Wouldn't a thermal switch and a two-speed electric fan be simpler and more reliable?
Yes!
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Old 04-26-2016, 08:26 AM   #5
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barmbc

No idea why/how this system was used.

There are some advantages. I guess it takes advantage of the hydraulic system used for steering. The system is variable speed based on engine temp, which may be more efficient.

There are some systems that use the electronic controller but it also has it's problems. I've seen multiple postings of people having problems with this. Source Engineering has actually come up with a conversion that uses the thermo wax valve.

I did have to replace mine but after I installed the new one I took the old one apart and found a piece of cloth/thread in it. I had my coach into Cummins Crosspoint for a radiator change and they probably wrapped the thermo valve in a rag and a small piece got in it. I was hesitant to take it apart before I got a new as the coach would have been completely disabled while I procured a new part.
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