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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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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
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL
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Old 06-14-2016, 07:15 PM   #3
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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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