Thermocure engine flush smells bad is it a sign. - Vintage Mustang Forums
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post #1 of 16 (permalink) Old 01-21-2019, 10:53 PM Thread Starter
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Thermocure engine flush smells bad is it a sign.

I usually flush every few years, but I half assed it the last two time by drain by just the radiator and running three passes of pir distilled water. Then refilling with 60/40 zertec G05 and water wetter. Well I decided to a thourgh flush because I noticed a red/orange well on my cap. Tried prestones flush drained then power flushed with heater hose t for 30 minutes. Radiator still looked orange, it aluminum so no good. I searched here and noticed people using thermocure flush. I drained the fluid one more time and dumped it in. Took about two days and the stuff is black and smells like sewage. I have drained the block and filled with distilled water and it's still black and stinky. This normal?
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post #2 of 16 (permalink) Old 01-21-2019, 11:02 PM
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Keep flushing till the water runs clear.
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floovb, floovb, vwomp, vwomp (sound of a bad tire driving)
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post #3 of 16 (permalink) Old 01-22-2019, 09:50 PM
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As I remember when I used it, yes, it is normal to turn blackish and to stink. That happens when it is bonding to the iron particulates. You need to flush that stuff out of the block's passageways like EvenFlow suggested.

For confirmation, read some of the comments:

As others have said it smells awful when you drain it, and if your system is as bad as mine it may come out as a sludge. I had to do both a hose flush and run 20 gallons of distilled through after to clear everything out. (Summit Racing)

Using this flush did produce a black grungy color and many small black particles with the smell of rotten eggs. Not sure if this was a reaction to rust or not. One caution is don't only do two, after use flushes, as is in the instructions, you will still be left with black-ish grunge in the coolant after running the car for a time. I had to re-drain and flush with a garden hose a lot, thereby wasting new anti-freeze, to get to clear coolant. (Amazon)
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post #4 of 16 (permalink) Old 01-22-2019, 10:39 PM
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I had to flush with fresh water a 3-4 times to get rid of smell. Thermocure worked great though.
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post #5 of 16 (permalink) Old 01-23-2019, 12:16 AM
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I flushed my engine several times after using thermocure. It never seemed to want to completely run clear. So I ran thermocure through twice more flushing in between. The third time the thermocure didn't turn as black or smell as bad and I was able to flush it all out. Make sure you open the block drains as well because the particulates will want to settle down at bottom of the engine. I think it finally cleared out all the rust and I haven't overheated since.
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post #6 of 16 (permalink) Old 01-27-2019, 10:45 PM Thread Starter
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Well I only back flushed it before I put thermo stuff in just distilled water and drain one side of the block. A bit of a pain to get driver's side. 6 times and it's finally just orange. Taking way longer then any other flush I have ever used.
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post #7 of 16 (permalink) Old 01-27-2019, 10:51 PM Thread Starter
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Still foaming 7th time
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post #8 of 16 (permalink) Old 03-11-2019, 12:01 AM Thread Starter
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so after 3 more times I decided to try again. I did another round of thermocure just for good measure. It didnt turn as black as the first time. I used the prestone flush kit and reverse flushed it for 2 hours. I then removed the drain plugs on each side of the block and let it run for a few seconds. I flushed it again for approx 20 and drained the block again. it finally came clean from everywhere. *though i was done* I filled it with distilled and moved it into the garage to finish today (Rested about 14 hours). To my surprise it was that nasty yellow red again. WTF I just flushed it with regular water 2 more times and its back to the nasty yellow orange color. I am now a little concerned. I know I didnt run it while flushing and it was run about ten minutes to put it back into the garage. What the hell am I doing wrong? I have NEVER had this much problems from a block that never went more then 3 years without a flush.
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post #9 of 16 (permalink) Old 03-11-2019, 12:33 AM
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Just pure water allowed to sit in the iron will get that rusty color pretty fast if allowed to sit any time at all. Flush and flush again with tap, until all clear, drain the radiator, engine and heater core and add 60:40 coolant : distilled water. I used two gallons of white vinegar and OH LORD at the crap that came out of my engine before I put in a new radiator !!

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Older son's 1st car...
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post #10 of 16 (permalink) Old 03-11-2019, 12:57 AM
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Where you driving to heat cycle it while you had the TC or the Prestone in the system? It needs agitation and flow to work on any sediment and expansion to get all the surfaces well.
TC works until it gets black, if it came out black then there was more rust in the system.If you keep treating with TC or Evaporust and it drains out a sort of amber, not like coffee then all the rust is gone and so that fluid can still be used to de-rust something else.
The downside is once the rust is gone it it primed to re-rust with a vengeance. If you never got all the rust out or if you left it without an inhibitor for any length of time it will oxidize again. Is is akin to the gun bluing process so it needs protection after its cleared of rust.

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post #11 of 16 (permalink) Old 03-11-2019, 03:18 PM Thread Starter
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So should I start again? It getting expensive. 50 gallons of distilled water and 2 bottle of thermocure. Or could I just flush the tap water 3 times with distilled and be good. I flushed it basically all day Saturday and went to start the distilled cleaning process sunday. I want this done. Got lots of stuff to get it ready for cruise season.
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post #12 of 16 (permalink) Old 03-11-2019, 06:07 PM
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I would flush with tap water until everything is clear, then drain everything and put in my coolant and top with distilled water. Done.

My 1st car...
'66 Tahoe Turquoise/ Aqua coupe
•289 / 4100 •C4 Auto •Disc Brakes
•Dual Exhaust •Quick Manual Steering
•Rally Pac •Console •Deluxe Belts
•LOTS of Rotunda accessories

Older son's 1st car...
'66 Emberglo / Parchment deluxe coupe
•289 / 2100 •C4 Auto
•Dealer A/C • Console
•Dual Exhaust • Power Steering

Younger son's 1st car...
'66 Nightmist / Blue & white deluxe coupe
•289 / 2100 •C4 Auto
•Factory A/C •Console
WAITING FOR RESTORATION

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post #13 of 16 (permalink) Old 09-10-2019, 04:01 PM
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Quote:
Originally Posted by dspmustang View Post
Still foaming 7th time
Sorry to bring up an old topic. Did your foaming finally go away?
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post #14 of 16 (permalink) Old 09-13-2019, 02:12 PM
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Quote:
Originally Posted by 1ofAMillion+ View Post
Where you driving to heat cycle it while you had the TC or the Prestone in the system? It needs agitation and flow to work on any sediment and expansion to get all the surfaces well.
TC works until it gets black, if it came out black then there was more rust in the system.If you keep treating with TC or Evaporust and it drains out a sort of amber, not like coffee then all the rust is gone and so that fluid can still be used to de-rust something else.
The downside is once the rust is gone it it primed to re-rust with a vengeance. If you never got all the rust out or if you left it without an inhibitor for any length of time it will oxidize again. Is is akin to the gun bluing process so it needs protection after its cleared of rust.

was it normal to see foam in the radiator? I keep flushing but when i fill it with water to flush its foaming at the rad neck.
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post #15 of 16 (permalink) Old 09-13-2019, 06:57 PM
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Yes, I had foaming even before using the TC though but I had run several other things doing flushes, not stop leak stuff.
I don't know what causes it but have seen in it several old radiators/engines and others smarter than me ignored it and so will I until I learn different

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