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Old 06-14-2020, 10:43 AM   #1
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Radiator flush left in radiator!

Well, I wanted to save a few hundred bucks (as we all do!) so instead of going to the RV center for a much needed radiator flush, I purchased my own fluid and took it to my local quick change oil place where they said they'd vacuum out the old fluid and add the new for $40.!!! Well, the radiator says it holds 6.5 gallons. Before they started sucking out the old they added the radiator flush I provided (instead of draining, adding water and flush, draining and refilling with new fluid). They ran the engine for about 15-20 minutes, then vacuumed out the old fluid and flush. Only 4.5 gallons came out of the 6.5 gallon reservoir! They then added 2.5 gallons of new coolant and the appropriate water (Not distilled!) The engine is running cool and even in 100 degree heat, it's only getting to 195-200 degrees, which is good. My concern in that they didn't get all of the old coolant out or all of the flush out AND they mixed the new coolant with tap water vice distilled water. My question is, will the small amount of flush left in the radiator hurt anything or should I drain myself, flush a couple of times and start over??? Thanks........
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Old 06-14-2020, 10:47 AM   #2
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Might want to send a sample to lab for testing.
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Old 06-14-2020, 10:49 AM   #3
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You already know the answer. Have it redone correctly. It may be fine for now but long term you could have corrosion issues that could be very expensive to repair.
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Old 06-14-2020, 11:26 AM   #4
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Did you buy radiator flush or just coolant? Big difference.
If it's just coolant, then call the place and ask what type water they use.
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Old 06-14-2020, 11:37 AM   #5
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I provided the flush, then I also provided fleet charge antifreeze.
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Old 06-14-2020, 12:03 PM   #6
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Yes, flush it out, not worth the risk of high solids or chemical reactions

Which Fleet-Gard did you go with?
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Old 06-14-2020, 12:17 PM   #7
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The old adage, if you want something done right. Do it yourself.

I came to the conclusion many years ago that I cannot afford to buy cheap. Had a neighbor that told me he had just bought a cheap wrench and though he hated it, it was cheap. It was the forth one. Hello?
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Old 06-14-2020, 12:25 PM   #8
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I changed out my antifreeze when I bought the coach in 2017 including the filter for the long term red stuff. It was part of fixing an hot running engine that was the wax valve. I just decided to do it all. Most quick lube places have next to no training. BTW, mine holds 11.5 gal.

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Old 06-14-2020, 01:00 PM   #9
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I guess you should have supplied the distilled water as well !
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Old 06-14-2020, 01:10 PM   #10
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Eric,.. don't know what engine you have, but when I last changed my coolant fluid, it was impossible to get all of the old coolant out by draining and there was somewhere around 1 1/2 to 2 gallons remaining ( made sure heater core was open and up to temp) that could not be gotten out. I did flush my system 5 or 6 times to insure I had as much of the old coolant out and only water in the system when I replaced with undiluted coolant (final charge). If it were me, I would have an analysis done and you will probably find you are good... but at least you will the know either way.
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Old 06-15-2020, 09:21 AM   #11
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Now the petcock!

Well.....I got ready this a.m. to change out the fluid (again!) and went in under the rig to access the petcock drain . Well, it turned and turned and turned! It seems that the 'T' has stripped! is there an easy method for removing the stem and replacing with a new petcock, or should I leave that up to a radiator specialist? Thanks, Eric
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Old 06-15-2020, 09:29 AM   #12
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Peak Fleet Charge concentrate

Peak Fleet Charge concentrate is the coolant I went with. It was moderately priced and had the correct additives for diesel engine radiators...
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Old 06-15-2020, 09:46 AM   #13
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Sometimes It feels stripped but just doesnít have a stop when going in. Is the water coming out with the coolant cap off?
I would flush the system several times with regular water, drain the best you can ( there should be a plug on the block or take off one end of the lowest coolant hose) then fill with distilled water and correct coolant per the engine manufacturer. Might as well do it right yourself so you donít have to worry about it.
Good luck
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Old 06-15-2020, 11:11 AM   #14
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good point. I turned it while the cap was still on. Perhaps the vacuum is so strong it wouldn't allow the fluid to flow out. I'll try again.....Thanks
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