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Old 03-03-2008, 02:08 PM   #1 (permalink)
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Flushing out radiator? (rusty colour)

Ok, Only got approx 50 miles on new 331 stroker. I used new coolant mixed with water approx 50/50. However when I open the rad cap and look at it, It has a rusty looking colour to it. Very evident when looking at the clear over flow cannister as well.

What is the best way to flush out the rad? Can I start the car and stick a garden hose in the rad while the car is running so that I can flush out that rusty looking crap? Then refill with coolant again? Any help would be greatly appreciated. Thanks.
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Old 03-03-2008, 02:42 PM   #2 (permalink)
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Re: Flushing out radiator? (rusty colour)

Question is why is it rusty with a 50/50 mix?

I've always put a hose connection inline on a heater hose and flushed that way.

Don;t for get to remove the Tstat.
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Old 03-03-2008, 02:52 PM   #3 (permalink)
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Re: Flushing out radiator? (rusty colour)

In answer to your question the answer is NO.

You cannot open the petcock and run a garden hose in it... The thermostat would never open enough to do anything but trickle......

You CAN however, Remove the thermostat, take off one heater hose, start the car and let her fly with the hose going into the heater hose, and when you get good clear water out of the other end of the heater core, you got a clean system for the most part.

There is almost no way to get all the crap out of a motor. Extensive washing with a pressure washer with the engine out and the freeze plugs removed is about the only way. Our wash tanks aren't specific enough on the interior of the motor where the coolant flows. Therefore the garden hose trick without the thermo, works pretty darn good.

Do it BOTH directions and you'll clean it out good.

Don't foret to let out all the water and go back to 50/50. The block holds quite a bit.


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Old 03-03-2008, 02:53 PM   #4 (permalink)
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Re: Flushing out radiator? (rusty colour)

SOrry Dfree... Didn't see your part about the thermo and hose.... Derrr I feel like a tard...
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Old 03-03-2008, 02:56 PM   #5 (permalink)
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Re: Flushing out radiator? (rusty colour)

I think that it is rusty because when I had the motor on the dyno, They drained all of the fluids then I had it in my garage for about 3 weeks or so before I installed it in my falcon. Right before I installed it I noticed that there was still some water draining out of the block... I guess it turned rusty. And now that I think about it there probably is only one 4 liter of coolant in there. The rest is water, So it definately isn't a 50/50 mix. I will drain the rad and fill it up with the proper coolant to water ratio. Thanks once again.
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Old 03-03-2008, 03:01 PM   #6 (permalink)
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Re: Flushing out radiator? (rusty colour)

Thanks for the info guys.

Last edited by BLACK65FORDFALCON; 03-03-2008 at 03:52 PM.
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Old 03-03-2008, 09:13 PM   #7 (permalink)
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Re: Flushing out radiator? (rusty colour)

I've always used distilled water and have had no brown/rusty water.
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Old 03-04-2008, 04:24 AM   #8 (permalink)
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Re: Flushing out radiator? (rusty colour)

If you really do have a backwards turning waterpump ( from your other thread) that maybe part of the issue. The water and anti-freeze never mixed well enough to stop the rust. But yes, Pull the thermostat off, open the lower hose and run the water through it.

You will end up with a block full of water. So add 2 gallons ( if it will fit) of pure anitfreeze, then run it... it will mix, but you will not be at 50/50, just yet. You will need to drain some of the mixture you have, then add more pure antifreeze to get up to 50/50.
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Old 03-04-2008, 01:18 PM   #9 (permalink)
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Re: Flushing out radiator? (rusty colour)

drain the 50-50 mix,fill with tap water and put a bottle of lestoil 15oz heavy duty multi purpose cleaner and run the engine for 15 to 20 minutes, drain and flush completly, fill with distilled water and coolant. cheap and very effective.good luck...
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Old 03-04-2008, 08:33 PM   #10 (permalink)
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Re: Flushing out radiator? (rusty colour)

Don't forget to backflush the heater core. Those cores can catch and hold a lot of particles.
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Old 03-06-2008, 09:37 AM   #11 (permalink)
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Re: Flushing out radiator? (rusty colour)

Disconnect the heater from the engine when you flush it or you will likely plug the heater core. If you run a loop of hose instead of the heater, add 1/4 cup of automatic dishwashing soap to the water mix already in the engine and run it to get it warm (block half the radiator if necessary) and the run it for a couple of hours. Drain it, flush with clear water (from a garden hose) until it runs clear and then drain and immediately refill with antifreeze and water 50/50 mix.
You can flush the heater core by running water from the hose through it backwards (so the water runs out the hose that goes to the block) until it runs clear. Running water through it in the other direction just packs the crud into the heater core more. Only flush the heater core while it is diconnected from the engine (both hoses) becaust your household water supply can be 70 PSI or higher and the core is not made to take that pressure.
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Old 03-06-2008, 11:07 AM   #12 (permalink)
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Re: Flushing out radiator? (rusty colour)

Thanks Paul, Good info. I however don't have a heater box LOL. However, I probably only have a 25/75 coolant mix. I will drain it all out and fill it up with a true 50/50 mix. Thanks once again.
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Old 03-06-2008, 01:51 PM   #13 (permalink)
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Re: Flushing out radiator? (rusty colour)

Quote:
Originally Posted by FEandGoingBroke View Post
SOrry Dfree... Didn't see your part about the thermo and hose.... Derrr I feel like a tard...
Tard....that is funny. I hadn't heard anyone use that in a long time. Time to bring it back.
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Old 03-07-2008, 11:36 AM   #14 (permalink)
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Re: Flushing out radiator? (rusty colour)

I had a mid 80's car that the coolant turned brown in the minute I poured it in. The lady I bought the car from had it serviced regularly at the dealer with receipts for the 80K miles the car had on it. I changed, flushed, changed, flushed with no result. I finally drained, refilled with tap water, drained, refilled with tap water, pulled the upper radiator hose, and ran the car with the hose in the radiator and the upper radiator hose discoed. When the thermostat opened I had to increase the water supply as the upper hose was discharging hot water on the ground. I ran it this way til the engine was well up to temp and the discharged water was clear. I redrained, and filled with coolant only til I was at the 60% of what the system held. I then topped with distilled water.


I knew I could never totally drain the block, so this method ensured that I had at least a 50/50 with some wiggle room. I did not like the idea that there was a certain percentage of tap water in the block, but it was never a problem in the next 190 thousand miles. The coolant stayed clean til I sold the car.

This might be an easy way to get that rust out cause it does not sound like you have a bad sediment problem, just rust that was allowed to build.

HTH

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Old 03-08-2008, 05:53 PM   #15 (permalink)
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Re: Flushing out radiator? (rusty colour)

I may have missed something, but it sounds like are y'all talking about draining and flushing antifreeze onto the ground. That used to be OK before we realized that that shtuff is poisonus as hell. You'll never have grass or weeds grow back, if you do it in the driveway, you'll have antifreeze leech out of the concrete every time it rains, you dogs will drink it and die...If it kills grass weeds & dogs, I wouldn'y want my kids around it.

My wife's sister lost three pugs, one dies outright & she had to put the other two down after they drank some antifreeze that her nimrod neighbor drained out of the base of a basketball goal. Yes, they were in their own fenced in yard - the water flowed under the fence & they drank it.

Now, I'm not a tree hugger or anything & I've installed those Prestone flush kits on more than one car, but at the time, I had no idea that stuff was as evil as it is.

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