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Old 07-15-2011, 03:57 PM   #1
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Changing to ELC Coolant

I have a 2005 National Tropical with a Cat 350. I'm going to be changing the coolant over to the newer ELC formula. Has anyone done this themselves? If so, can you offer any suggestions on how you did it and the procedure you followed. I have many questions. Thanks.

Rob S.
2005 Tropical LX
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Old 07-18-2011, 11:51 AM   #2
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I did my 04 Tropi Cal a couple of years ago also changed out the thermostats at the same time. I found the procedure in the Cat manual that came with my coach and just followed that. I have a large galvanized wash tub that I use for oil changes and also used it for the coolant change. I purchased the 50/50 premix. The only thing I really remember is you will introduce air into the system and you need to open the pitcocks on the hose lines until you get a good flow after filling. I had to do this a couple of times after starting and warming up the engine.
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Old 07-18-2011, 11:59 AM   #3
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Thanks for the help. Where are the petcocks? I see valves to shut off the flow to the heater hoses along the frame near the transmission. Right after the valve, on the heater side, is a petcock. Can you use this to drain the system? Are there additional petcocks I am missing? thanks.
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Old 07-18-2011, 12:40 PM   #4
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Like I said; it has been two years plus I no longer own the coach so I don't have the Caterpillar engine manual that came with it. I am pretty sure that is where I drained the system plus I had the thermostats out. You need to drain and flush with clean water before removing the thermostats.
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Old 07-18-2011, 02:24 PM   #5
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Thanks for the information.
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Old 07-18-2011, 02:31 PM   #6
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Do you have the Caterpillar engine manual that came with the coach? All the info was in there.
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