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Getting ready to flush the coolant system on my 67 Charger 383. Has anyone used Thermocure or CLR Radiator Flush? Recommend, don’t recommend? Worked well or didn’t? One better than the other?
I used CLR. Did it about 3 times, then followed up w Cascade dishwasher powder 3 times, then fresh water a couple times till it was perfectly clear. Then 50/50 distilled water n antifreeze. Plus 2 pints of the pink coolant additive. I was having serious cooling issues. Now it's hard to get my 496 over 165° when it in the 70's and never above 195° when its in the 100's with a 180° t-stat. I liked the CLR.
I used the Thermocure in 3 cars. It’s AWESOME! It will clean up the cruddiest cooling system with one use.
You must take out the block plugs and get all the antifreeze out first, nothing but water in the system. It’s one jug per 3 gallons of water. I left it in for several days and drove the car to get it warm. The instructions say to do this. Drain it all and fill with water a couple of times and then it comes out spotless at the end. Put in antifreeze. Be a brave soul and buy the 100% coolant and mix in the water yourself. You will save money doing this.
To get the plugs out of the block use a 6 point 9/16” socket, if they don’t come loos try tightening first. Is there is a layer of scale poke through it so it drains there. Rinse it out good, then fill with water, run car till hot. Drain again and then add thermocure. Use anti seize compound on them on final installation.
makes me want to go buy a case of it before it’s discontinued. Summit sells it.
I've used the smaller bottles of CLR before with good results, I just followed the directions like on the Thermocure bottle. Wash, rinse, repeat until clean. I've also have had good luck with the Prestone Super Flush following the same procedure as above. Good Luck
I did two rounds of Thermocure last year. On the second drain/rinse a nasty clay like goo came out of the block plugs that must have been old head gasket seal or similar crap. Like Demonic said you'll have to rinse a lot, or you'll smell it in the coolant for a while. Clean and clear now.