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Old 09-20-2012, 03:32 PM   #1 (permalink)
FloridaHorseman
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Engine coolant flush

I just experimented with a cooling system flush (radiator included) using Cascade dishwasher detergent powder. I read about some using that on another board so I gave it a try. Worked better than anything else I've ever used. Oil and rust residue are gone. Hoses are no longer slimy inside and the radiator innards shine like a new penny. No foaming or sudsing during the flush at all.

On a cold engine I drained the coolant, removed the thermostat, added one cup of Cascade mixed in a quart of water and topped off the system with water. Then I ran the engine for about 2 minutes and flushed with fresh water. I repeated that three times, finishing up with an open system fresh water backflush for about 5 minutes and then topped off with plain water.

I'm going to run it up to operating temp a few times and flush it one more time before going back to coolant. But I'm really impressed with how well Cascade does as cooling system detergent. ~FH

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Old 09-20-2012, 05:13 PM   #2 (permalink)
1995yukon65
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You posted this just in time, I'm going to be flushing mine this weekend and replacing the thermostat. Thank you for this info

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Old 09-20-2012, 05:17 PM   #3 (permalink)
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I suggest for the final fill-- use distilled water-- only about a dollar a gallon from Walmart. Some drinking water can damage the cooling system over time.
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Old 09-20-2012, 05:35 PM   #4 (permalink)
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Quote:
Originally Posted by JC1843 View Post
I suggest for the final fill-- use distilled water-- only about a dollar a gallon from Walmart. Some drinking water can damage the cooling system over time.
I'm familiar with the additional crap in tap water. I'm just running it for a day or two to make sure I have all the other crap and any residual detergent flushed out before I go back to coolant. ~FH
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Old 09-20-2012, 07:20 PM   #5 (permalink)
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Quote:
Originally Posted by FloridaHorseman View Post
I'm familiar with the additional crap in tap water. I'm just running it for a day or two to make sure I have all the other crap and any residual detergent flushed out before I go back to coolant. ~FH
Thanks for the tip on that.I'll definately try that when I do the next flush.
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Old 09-20-2012, 07:28 PM   #6 (permalink)
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I have used cascade many times. It works great. Does no harm. X2 on the distilled water.
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Old 10-16-2013, 12:44 AM   #7 (permalink)
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Hello all,

I realize this thread is over a year old, but had a few questions on it. Couldn't see making an entirely new thread for a few clarifications .

Do you guys run the Cascade mix, drain and flush, then repeat the entire procedure 3 times? Or only 1 Cascade mix, then clean water 3 times?

Have also read on other forums that some run for 30+ minutes with the soap mix in. Still recommending to run only to temp, or longer?

Hoping to do this before winter, along with thermostats of course. Will definitely buy the Delco thermostats, some places list 3 different temp Delco units though ...

Thanks guys,

Joe
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Old 10-16-2013, 06:45 AM   #8 (permalink)
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I only do the detergent mix 1 time, followed by multiple flushes. Make certain you have the thermostat removed for flushing, heater controls on full hot and get the engine to operating temperature. ~FH
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1998 Chevy K3500, 454 horse hauler , 175,000 miles, tuned flow-through exhaust, pillar gauges (vac, trans temp, volts), electric cooling fans, external trans cooler & fan, manual TCC lockup mod, limo tint, front & rear brush guards, B&W G/N flip hitch, spray-in bed liner, chrome wheel inserts


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Old 10-16-2013, 10:33 AM   #9 (permalink)
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Quote:
Originally Posted by k30_dump View Post
Hello all,

I realize this thread is over a year old, but had a few questions on it. Couldn't see making an entirely new thread for a few clarifications .

Do you guys run the Cascade mix, drain and flush, then repeat the entire procedure 3 times? Or only 1 Cascade mix, then clean water 3 times?

Have also read on other forums that some run for 30+ minutes with the soap mix in. Still recommending to run only to temp, or longer?

Hoping to do this before winter, along with thermostats of course. Will definitely buy the Delco thermostats, some places list 3 different temp Delco units though ...

Thanks guys,

Joe
Joe,
I run the 195F thermostat. It sure is nice in the winter. I haven't had any overheating issues in the summer either but I'm not towing heavy. Do a search, lots of people have weighed in with their opinions.
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Old 10-16-2013, 12:24 PM   #10 (permalink)
k30_dump
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Thanks for the replies. Hoping to do this in the next couple of weeks .

As for what temp thermostat, not sure how many the dealer actually sells. Was looking briefly online, and as I said before, know better than to buy one that's not OEM. Was surprised to see different temp (and quality grade) from Delco though. Think I'll just go with what the dealer stocks...

Not sure what temp is in there now, she always runs on the second bold line (1/4 gauge)

In the searching I did do, seems most agree that the 6.5 is more powerful and smoother with the hotter (195 unit). I don't do much towing at all, hauling coal twice each winter is the heaviest workout she usually gets. Think I left the [email protected] 15,200 last haul

Thanks again guys,

Joe

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Last edited by k30_dump; 10-16-2013 at 12:31 PM.
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