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Old 06-25-2022, 12:24 PM   #1
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Should I replace Thermostats

I'm currently changing the hoses and coolant in my Cat engine (C9 serial #c9s01083) and debating whether I should change the thermostats. I have 72,000 miles on the coach and have not experienced any overheating issues. Did blew a hose which is why I'm replacing and want to go back to Cat ELC which was lost when hose blew.



Also looking to verify location of thermostats. Believe I have two and will send pictures of where I think they are located shortly.
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Old 06-25-2022, 12:26 PM   #2
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Yes you should
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Old 06-25-2022, 12:35 PM   #3
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First photo I can see the thermostat. Can someone verify next photo is where 2nd thermostat is located? If not can you tell me where it is.

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Old 06-25-2022, 12:43 PM   #4
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Quote:
Originally Posted by the sights View Post
Yes you should


Thatís what Iím thinking, this is turning into bigger project than I planned. Spending fair amount of time just finding the right Gates hoses, especially the 90 degree ones.
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Old 06-25-2022, 01:29 PM   #5
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Hey Ken, when I replaced the coolant hoses on my Cat I was able to get the complete set from my Freightliner parts guy. I just gave him the last six numbers from my VIN and he pulled up the drawings and associated part numbers for my unit, if you have a FL chassis give them a call.

I ran across a video that shows the location of the two regulators/thermostats at minute 3:47. You can get those and the gasket from a Cat parts/service center.

Hope this helps.

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Old 06-25-2022, 02:14 PM   #6
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[QUOTE=JaminSamin;6225946]Hey Ken, when I replaced the coolant hoses on my Cat I was able to get the complete set from my Freightliner parts guy. I just gave him the last six numbers from my VIN and he pulled up the drawings and associated part numbers for my unit, if you have a FL chassis give them a call.

I ran across a video that shows the location of the two regulators/thermostats at minute 3:47. You can get those and the gasket from a Cat parts/service center.

Hope this helps.


Thanks: Chassis for the Beaver is Roadmaster so out of luck there. Watched the video and they make it sound like two thermostats are under the same housing. Will explore that, but the housing doesn't look like 2 would fit there. Plan to call Cat Monday.
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Old 06-25-2022, 05:54 PM   #7
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Here Ya Go

https://parts.cat.com/AjaxCATPartLoo...&storeId=21801


https://parts.cat.com/AjaxCATPartLoo...&storeId=21801


https://parts.cat.com/AjaxCATPartLoo...&storeId=21801
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Old 06-25-2022, 06:23 PM   #8
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Since you are doing all this work you might consider changing the water pump.

Check your idler pulley's also, I remember a post on Cat idler pulley's recently, you might do a search.
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Old 06-27-2022, 01:33 PM   #9
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Cat sure are proud of their parts and not afraid to charge for them. Regulator (thermostat) $68 and grooved pulley for belt $160. Thought about replacing the tension pulley but they wanted $300. Pulleys are ok but thought I'd keep take offs as spares.


Determined I only have one Regulator (thermostat) part number 284-8264.


Jim new water pump would run over $800, so gonna pass on that one.
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Old 07-05-2022, 10:39 PM   #10
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X2 on the water pump. But you should be able get a a CAT exchange pump. It will care same warranty but be approx 1/2 of new. Safe Travels
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Old 07-06-2022, 06:21 PM   #11
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Water regulator has now been changed. Still working on replacing some of the coolant hoses, but almost done.
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Old 07-24-2022, 11:35 PM   #12
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Did you install an original 205 degree thermostat or did you drop down to 195 or even 180?
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Old 07-25-2022, 04:43 PM   #13
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Regulator was 89C or 192.2F and new was same setting.
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