cruiser
Well-Known Member
MoBros: Just thought I'd post a quick review of my first ever experience with Thermo-Cure cooling system flush. My 1974 Duster has a 1974 dated replacement 225 slant six engine that was installed in 1988 when my original slanty died. The replacement engine was sold as a rebuilt unit, so I assume that they did a complete flush and cleanout of the block prior to rebuilding it. I heard that Thermo-Cure is a pretty good product, so I thought I'd give it a try since it was time to change out my old coolant anyhow - and here are my results. First, I had to order a one quart bottle from NAPA. They don't sell it on the shelf, and it's a bit pricey - around $30.00. As per the directions on the container, I first blew all the old coolant out of my engine by removing the lower radiator hose and the drain bolt in the side of the block, then hooking up a garden hose to the flushing kit tee in the heater inlet line. With the engine running and the radiator cap off, I used the plastic deflector that came with the flushing kit to direct the coolant discharge flow away from my alternator. Once everything was clean and nicely blown out, I added the quart bottle of Thermo-Cure. The instructions tell you to leave it in for several days while you drive the car. I ended putting about 400 miles on the car during this period, which I felt was plenty of time to let the product do its job. After the engine cooled, I hooked up the garden hose to the backflushing tee, then opened the radiator drain **** and the drain bolt in the block. With the radiator cap removed and the plastic deflector in place, I turned on the hose and immediately a solid stream of coffee colored coolant came flying out. It actually looked like dark coffee coming out of the engine via the deflector, the block drain and the radiator drain ****. I was so captivated by this sight that I forgot to take a photo to post here! Anyhow, I let the hose blow everything out for about 15 minutes with the engine running. It took that long for all the crud in my cooling system to come out. Eventually, I had a stream of clean and clear water coming out of the radiator and drain ****, block drain and deflector. I completed the process by installing 6 1/2 quarts of Prestone II classic green antifreeze to create the perfect 50/50 coolant mixture that the FSM calls for. I also took this opportunity to thoroughly clean out the coolant reserve bottle and its supply line from the radiator. And yes, I mix my Prestone II with tap (not distilled) water and have had excellent results with no contaminant or calcium buildup in my original, re-cored copper and brass radiator. My city has a water softening system in our public water supply, so all that bad stuff comes out of the tap water before it gets to my house. In any case, my cooling system is extremely happy and keeps my motor right at 195 degrees all day while protecting against corrosion. So I'd have to say that I had very good results with this product and can recommend it, for whatever that's worth. Please feel free to add your comments if you have used Thermo-Cure. And no, I don't work for them - I'm just a guy who decided to try their stuff for the first time. Thanks, all!
Last edited:
