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Old 06-14-2016, 04:19 PM   #1
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Thermo/switching valve

I am trying the determine whether the thermo or the switching valve is bad on a Detroit series 60. Fan is running hot so I disconnected the 2 lines from the thermo valve & connected them together with no change in the fan speed. I did not block both lines because the fan speed did not change. I am assuming that the only other thing could be the switching valve. Therefore I am wondering if there is a way to test if the switching valve is operating properly. Any advice as to how to determine what is causing the problem would be appreciated.
I have a 2005 Monaco Signature Conquest 44'

Thank you.

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Old 06-14-2016, 05:20 PM   #2
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Location: Silver Springs, FL. USA
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If its a variable speed fan, the default is usually full speed. That's so that a control failure still provides adequate cooling for any situation.

Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
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Old 06-14-2016, 07:15 PM   #3
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Posts: 4,834
I suspected a problem with my thermovalve and contacted Monaco Tech support and they told me to do 2 things.

plugged both lines and the fan ran wide open.

put a union in between both hoses and the fan ran at an idle

These 2 tests show that the switch control is good and that the thermo valve is bad.

I bought a thermo valve from White House Products in UK, cost ~$265 including shipping and Exchange rate.

My part # is 553/1/09857/210 THERMO VALVE took about a week to get after placing order.
Jim J
2002 Monaco Windsor 38 PKD
2005 Jeep Grand Cherokee w/5.7 Hemi
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