Review of Evaporust Thermocure Cooling System Flush by average Joes...
I'm in no way being compensated for this review. When I see a good product, I want others to know about it.
I flushed out some rusty antifreeze from a 66, 289 V8 cooling system for a friend. There was not an overheating problem but the coolant was rusty as heck!
I've used Evaporust to remove rust on metal with excellent results. I heard about a product by the same folks called Thermocure that's used for flushing rust out of cooling systems. My friend bought a bottle of a brand name radiator flush at the local auto parts store but for my own selfish reasons, I convinced him to try Thermocure (I wanted to see if this stuff was any good.). He bought 2 quarts online ($21.99 a quart). 2 quarts of Thermocure treats a cooling system with up to a 16 quart capacity. The cooling system on my friends 66 Mustang is 14.5 quarts.
I told him to buy one of those flush kits that hook into the heater hose. We did a temporarily hook up of the flush tee to the top heater hose (picture below). I had an inline RV water filter so I hooked that up to the garden hose that was connected to the flush tee. Below are the steps we followed.
- Warmed up engine and drained out the old rusty coolant.
- Let engine cool a bit then flushed cooling system from tee until the water ran clear.
- Drained the cooling system from radiator petcock. A little more than 2 gallons drained out. We did not remove the drain plugs on the engine block during the entire procedure.
- Added 2 quarts of Thermocure and topped off with filtered water from the garden hose.
- Over the course of 2 days, ran the engine for a total of 4 hours. 2.5 hours varying between idle and fast idle and 1.5 hours of driving at various speeds.
- Flushed cooling system using filtered tap water from garden hose for an hour and a half. We put a piece of cardboard in front of the radiator to get the temperature up so the thermostat would open.
- Drained cooling system from radiator petcock (about 2 gallons) and filled with distilled water. Ran engine at fast idle for about 20 minutes and drained from radiator petcock. Repeated this procedure 3 more times. Used a total of 8 gallons of distilled water.
- Drained Radiator and put in 2 gallons of antifreeze and topped off with distilled water.
In my opinion the results were amazing! This stuff works really well. I would have left the Thermocure in another day or two but our schedules would not allow for us to do this. The first set of pictures show the coolant fluids that were drained from the radiator at different steps in the process. The second photo shows the fluids after they sat for about 2 weeks in the sample jars. All samples were taken from the radiator petcock.
First jar is the coolant before flushing.
Second jar is the Thermocure treated water. I have to say, that after the 2 week rest period almost all of the particulate stayed in suspension.
Third jar is after the 1 and a half hour filtered water flush from tee.
Forth jar is coolant after completing flushing process and adding fresh coolant. The sample was taken after about a month and 4 hours of driving.
Conclusion: This stuff works great for removing rust from the cooling system. I definitely recommend it. Hands down this stuff blows the doors of the auto store cooling system flush. Itís worth a few extra bucks to get the job done right. Two thumbs up! Great product!