Gunk C2124 Super Heavty Duty Radiator Flush - 22 oz.

Gunk radiator flush works very well it's a little bit of a pain to go through the process but when you're done your engines cooling system is clean and ready for antifreeze.

I couldn't find the "Super" Gunk cleaner in the stores and I was reluctant to pay $5 shipping on a $5 product, but I'm glad that I did. All kinds of junk was flushed from my 23 year-old radiator. I don't know how this compares to the non-Super flavor of this radiator flush, but no matter - I'm very happy with the results. Frankly, no Gunk product has disappointed or let me down yet!

I think it did what it was supposed to do. The coolant in my taurus was brown and murky and the heater core was becoming clogged. the new coolant is staying clean looking and the heater works better now.

Used this product to do a full flush of a somewhat neglected cooling system. Seems to have got small black beads (rust pieces?) out but there are a couple of gotchas that you should be aware of. 1. You will need to rinse with water at least three times after you drain this flush product from the cars radiator. Otherwise, white foamy residue will remain which- not clear to me- is okay to retain in the radiator long-term. 2. If there are weak components in your cars cooling system, they will fail- my car's heater bypass hose developed a leak almost immediately after I used the product. I am not blaming the product - if anything it may have accelerated failure of a marginal component. But I mention it here since potential for such failure exists with this product.

After suffering the dreaded GM 3800 LIM gasket failure, my coolant was a cruddy mess. Even after replacing the gasket and manifold and several flushes by my mechanic, my radiator cap was still getting gunked up after a few thousand miles. So I bought this stuff and the prestone back flush kit. I flushed once with pure water, then added this, ran the engine for a few minutes, drained, refilled with water and ran that for a week (not recommended but I was replacing the water pump, all hoses, radiator and catch tank anyway). I did another flush and replaced the cooling components and refilled with Dexcool. A month after the work, my coolant is still clear orange. Thanks!