d11gnccer
We have a few hundred accounts that are 95% air-cooled. I have reason to believe most liquid cooled systems in this area are lacking proper coolant maintenance unless they are serviced by our local industrial dealer. As our liquid cooled accounts grow, I'd like to have a standard in place.

What type of coolant do you guys use and how often do you replace?

I spoke with a Tech from an industrial dealer in training and he said before the unit leaves the shop it has a block heater installed and the coolant is replaced with 50-50 prediluted SCA precharged HD coolant. Every service truck carries it in prediluted form that way there is no question between techs at each service interval.

Generac shows Peak Fleet Charge 50-50 on the coolant program which appears to meet all the requirements listed above.

Are the added SCA's important or is that diesel territory and overkill for a small liquid cooled system sitting behind a house?
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BrentB
We use the Peak 50/50 from Generac.
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d11gnccer
BrentB;36326 wrote:
We use the Peak 50/50 from Generac.



Fleet charge with the added SCA's? Or simply 50/50 with no supplemental additives?
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PGuerin
We run fleet charge 50/50, we provide monitoring at each site visit with test strips that show freeze point, nitrate level and PH. Even tho most manufactures recommend annual change we suggest ever 2 years to drain and refill coolant. Again you are limited to what the customer will agree too, we can suggest all day but in the end they make the call, just did a radiator rebuild and reseal this past Saturday on a 6 yr old cat and was amazed how much the core was plugged up and how much corrosion was on the upper caps.
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PGuerin
Here are pictures from a 2008 Cat 60KW Natural Gas Gen with Ford V-10 engine we took over last year, coolant system has never been touched, has a modular radiator and the upper and lower gaskets were leaking so we did a tear down, reseal, flush and fill with 50/50 Fleet Charge
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