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#1 |
Registered User
![]() Join Date: Apr 2006
Location: Arkansas
Posts: 55
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Cooling System Flush Advice Needed
Hey gang...
Could use some advice. I had a mildly used 350 crate motor that i put a cam and aluminum heads on. Sat for years but i cleaned it up best I could in process. I setup on engine stand and used brand new nice radiator for my truck to break cam in. All is good but after running it, but now I noticed the radiator hoses have a crust on the inside of them i'm guessing from the messy internals of the engine cooling system. I could tell when i gave them a squeeze. It was like a crunchy film had attached inside the hose. Haven't inspected further. What's the best way to flush some of this out while it's on the stand so that don't ruin or plug up my new radiator or get a thermostat sticking? I want the engine tuned and good before i install in painted truck. Are there any honestly good chemical treatments to get all the passages, hoses, radiator as clean at least as possible without disassembly and hot tanking the thing? Thanks in advance |
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#2 |
Registered User
Join Date: Feb 2015
Location: San Diego, CA
Posts: 409
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Re: Cooling System Flush Advice Needed
I use tide, in powder form then flush repeatedly.
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At my worst I'm at my best |
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#3 |
Registered User
![]() Join Date: Apr 2006
Location: Arkansas
Posts: 55
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Re: Cooling System Flush Advice Needed
Interesting....
How much tide, how long running, and how many flushes? Do you do that with the antifreeze in it or drain and refill with tide and water? Does it work better than some of the chemical flushes sold at the parts stores? |
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#4 |
Registered User
Join Date: Feb 2015
Location: San Diego, CA
Posts: 409
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Re: Cooling System Flush Advice Needed
Jet a scoop or a serving from a laundromat. I drain the system first and then go through a heat cycle with the detergent in the motor/radiator. I flush until clean water is all that’s left. It’s time consuming but effective. Actually done this a few times when oil coolers has crapped the bed and put oil in the coolant system.
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At my worst I'm at my best |
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#5 |
Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,544
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Re: Cooling System Flush Advice Needed
Did you use distilled water + coolant for the cam break in? A lot of tap water is 'hard' or full of calcium products.
If you are worried about damaging the new radiator, use an old one for the engine flush process. Have you installed a new heater core? That can be another source of gunk getting into a new clean system. |
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#6 |
Registered User
![]() Join Date: Apr 2006
Location: Arkansas
Posts: 55
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Re: Cooling System Flush Advice Needed
I used pre-mixed 50/50 antifreeze. And its too late on the old radiator for break in as I/ve already done it on an engine stand. It has to be be out of the block as every other part was brand new when i added fluids and did break in.
Now i just have to get it as clean as I can while on the stand before i put the engine in the truck. I've seen some chemical flushes such as "Thermocure". I know i may not get it perfect, but i want to get as much crap out as I can. |
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#7 |
Registered User
Join Date: Jan 2018
Location: Danville, IL
Posts: 160
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Re: Cooling System Flush Advice Needed
Ive never done it but i heard CLR does a good job
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#8 |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,872
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Re: Cooling System Flush Advice Needed
Interesting read here; http://www.sancarlosradiator.com/VoltageDrop/flush.htm
When I flush a cooling system I just use the system he calls "The Live Flush" which is rinsing out the old coolant, adding a good commercial coolant cleaning agent, running it for a few days (at least 100 miles), then drain, rinse and refill. Seems to work for me.
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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#9 |
Registered User
Join Date: Jan 2000
Location: Wyoming USA
Posts: 2,445
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Re: Cooling System Flush Advice Needed
I used cascade just like hollow says he does with the tide ,came out nice and clean . Take your thermostat out while doing this
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2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327 |
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#10 |
Registered User
Join Date: Jun 2013
Location: Somewhere
Posts: 3,074
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Re: Cooling System Flush Advice Needed
Drain the system, which means the radiator and the block. The block has plugs near the motor mounts. you might need to poke the crap out to make the coolant drain.
Flush with whatever you like. Check and repeat as desired until things work/look as you desire. |
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#11 |
Registered User
Join Date: May 2016
Location: Henderson NC
Posts: 975
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Re: Cooling System Flush Advice Needed
Did you take the hose off and look inside? Hard to believe it could build up a crust that fast, are you sure it's not the spring inside the hose you feel.
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#12 |
Registered User
Join Date: Feb 2013
Location: central California
Posts: 2,735
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Re: Cooling System Flush Advice Needed
That gunk is heavy and it seems to settle at the bottom of the water jacket. Popping the freeze plugs provides a great access point for flushing it out. I even turned my engine upside down on the stand and really gave it hell with one of those siver "Gilmore" branded garden hose pistols.
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#13 |
Moderator
![]() ![]() Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
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Re: Cooling System Flush Advice Needed
I seem to remember small blocks also have a drain plug in the block water jackets, lower sides of the blocks.
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Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
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#14 |
Registered User
Join Date: May 2016
Location: Henderson NC
Posts: 975
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Re: Cooling System Flush Advice Needed
I don't understand how even if it had rust in the block how it could attach itself to the inside of the water hose especially with such a short run time.
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#15 |
Registered User
![]() Join Date: Apr 2006
Location: Arkansas
Posts: 55
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Re: Cooling System Flush Advice Needed
Yes, I'm puzzled too guys. I'll have to pulpit apart and look.
When i squeeze the rubbers hoses you can hear it crunch like it's a film of rust coated along inside of hose. |
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#16 | |
Registered User
Join Date: May 2016
Location: Henderson NC
Posts: 975
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Re: Cooling System Flush Advice Needed
Quote:
Some have springs some don't. Last edited by garyd1961; 02-15-2019 at 12:26 PM. |
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#17 |
Registered User
![]() Join Date: May 2006
Location: Yucaipa, Calif.
Posts: 786
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Re: Cooling System Flush Advice Needed
I can tell you for a fact I had the same situation as dhunt00c. My upper rad. hose crunched and when I opened up the thermo housing a bunch of what looked like red kitty litter dumped out. I've owned this truck for thirty years and there was never a spring in the upper or lower rad. hoses. I took pics and posted them on FB, otherwise I'd post them here too. I have a separate post on the GMT400 group discussing this same situation. That's why this post is interesting to me as well. I'm currently driving my truck around locally with flush cleaner in the cooling system.
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1989 K1500 Chev. EC Original owner; some of the aftermarket parts I've installed are Borla headers, Hypertech chip, Edelbrock water pump, and a Stillen rear disc brake conversion kit. 2009 Hummer H3T 3.7L 5M (sold) 1997 K2500 Chev. EC 7.4L/ 4L80E 2018 Dodge Ram 2500 HD R/C |
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#18 | |
Registered User
Join Date: May 2016
Location: Henderson NC
Posts: 975
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Re: Cooling System Flush Advice Needed
Quote:
I have seen a heater core get stopped up with rust but never a radiator hose. |
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#19 |
Account Suspended
Join Date: Jun 2015
Location: No longer here
Posts: 1,000
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Re: Cooling System Flush Advice Needed
Could you define mildly used crate engine. If that rust came from the engine I would be tearing that engine down before I put it in my nice 72 truck.
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#20 | |
Registered User
![]() Join Date: May 2006
Location: Yucaipa, Calif.
Posts: 786
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Re: Cooling System Flush Advice Needed
Quote:
I probably could've done a better job of flushing this engine out when I installed it six years ago after storing it for a long time.
__________________
1989 K1500 Chev. EC Original owner; some of the aftermarket parts I've installed are Borla headers, Hypertech chip, Edelbrock water pump, and a Stillen rear disc brake conversion kit. 2009 Hummer H3T 3.7L 5M (sold) 1997 K2500 Chev. EC 7.4L/ 4L80E 2018 Dodge Ram 2500 HD R/C |
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#21 |
Registered User
![]() Join Date: Apr 2006
Location: Arkansas
Posts: 55
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Re: Cooling System Flush Advice Needed
OK, when I say mildly used, it's probably very low mileage / hours of run, but it's an old engine and sat for a very long time.
In my situation, there is no heater core. It's just the engine, the water pump, the thermostat, and the new radiator. |
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#22 |
Moderator
![]() ![]() Join Date: Aug 2011
Location: China Spring, TX
Posts: 7,280
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Re: Cooling System Flush Advice Needed
Wow.
![]() I wonder what could be used to passivate a new engine. I'd be inclined to fill that rusty engine with Evaporust a few times. But then I still wonder if there is a way to passivate the jackets... ![]()
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Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
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#23 |
Registered User
Join Date: May 2016
Location: Henderson NC
Posts: 975
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Re: Cooling System Flush Advice Needed
First thing you should do is pull the radiator hoses of and see what's in there.
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coolant, cooling, flush, passages |
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