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Old 09-25-2021, 08:56 AM   #1
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Wax valve help

Many of you have changed to a wax valve to control the hydrlic fan. My 2001 350 8.3 turbo gave us some trouble on a recent long trip. I disconnected the electronic controller to default to high speed and never saw 188.. So trying to find the correct wax controller and hope to install myself. I know about Source engineering kits. It is my understanding that the last three numbers are the temperature at which the valve will operate at. 210, 190, 150 and maybe others. My question is, will the 190 do the job, or do I need the 210.??? [Mod edit].
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Old 09-25-2021, 10:46 AM   #2
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The 190 will work. Why would you want the motor to get to 210 before the fan operates?
What is your plan for installation? Are you going to use the SE kit or fabricate your own?
2002 Country Coach Intrigue
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Old 10-05-2021, 08:40 PM   #3
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Talking to Source he told me that the valve starts opening at 170 and is fully open at 190 giving full fan speed. Mine runs at 184 during typical driving, 70 mph for me. Full load on hills the temp will raise to 188. This with outside temp at 85 degrees. Before the wax valve install it would seldom be under 190 and under load would climb above 202 if I didnít adjust my speed or gear. This at 70 degrees outside temp. Sometimes it would keep climbing above 210. The only negative so far is a drop in fuel mileage due to the fan running more but acceptable to me.
Dan & Nancy
2003 Intrigue Suite Sensation 40ft
400hp Cummins ISL
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Old 10-06-2021, 07:52 AM   #4
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Wax Valve install

I did mine 3 years ago and very happy. 190deg was what I used.
Found a welder to install the fitting on the coolant elbow.
And I think I needed a additional hydraulic fitting but can't recall witch one.
Biggest PITA was draining the antifreeze about 7 gal till

i could the things apart.
Good luck
40' tag 04 Allure 370 ISL & 04 Jeep Rubicon toad
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Old 10-11-2021, 07:53 AM   #5
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What is the indication the old wax valve is failing. Do they go slowly or all at once. If slowly, a steady increase in running temp?
2001 Country Coach 40' Intrigue. #11304
Field of Dreams with factory four person dinette.
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Old 10-11-2021, 08:26 AM   #6
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Mine basically happened overnight. My fan went to high speed once the thermostat opened and sent hot coolant to the radiator. Thermovalve would open immediately and not close until everything cooled back down.

I talked to Monaco tech support when this happened and he had me do two tests.

I plugged both lines and the fan ran wide open.

I then put a union in between both hoses and the fan ran at an idle.
Based on this the Monaco Tech said the thermovalve was bad.

So I purchased a new one from Whitehouse Products and replaced. When I removed the old one I took it apart and found a piece of fabric in it probably from where Cummins had wrapped it in a rag when they changed my radiator.
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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