Gunk Radiator Flush

[New]

My experience with Gunk "10 Minutes" Radiator Flush.

It was the time to change the coolant and some leaking gasket, so I decided to do it myself. The car is 10 years old and no service records. I've got a can of Gunk "10 Minutes" Engine Flush, for a "total" flush.

Browsing the net I've encountered different opinions about keeping the thermostat in or not. I've decided to go for the flush without the thermostat to have the Gunk stuff flowing freely through the whole system.

So, I drained the old coolant, flushed with water and took out the thermostat housing. I've noticed a thin layer of white coating (most likely limestone deposits) on the inner surfaces of the housing. I wonder how the radiator internals look like! Here's where Gunk should work it's magic.

Next, I poured the Gunk stuff in, filled with water, ran the engine for 10 minutes then drained the mix out (by the book). I was expecting lots of debris out. But surprise, there was none! What the Gunk! The fluid was green and clear! Maybe the lime is dissolved in.

Flushed the system with two gallons of hot water. Took the thermostat housing out again only to admire again the nice white coating.

to cut the story short, my advice is: AVOID GUNK 10 MINUTES RADIATOR FLUSH!

New

 

[Jelly]

Here's what I do for a first time cleaning in a vehicle with a few miles on the clock...works absolutely great!

Buy many gallons of distilled water.
Buy two little jugs of Prestone Super Radiator Cleaner (NOT THE FLUSH!).

Basically, drain all the coolant from the radiator (using the tap on the bottom of the radiator) and fill it back up with distilled water. Run the engine until you fill the upper hose turn hot, and then drain the radiator again, and again fill up with distilled water. Continue to do this until the liquid flowing out of the radiator drain is clear.

BTW, make sure when your doing the routine that you have your heater on so you get the stuff out of the heater core as well.

Anyways, once the system is full of clean, distilled water, add the jugs of the cleaner and drive it around for several days (Instructions are on the cleaner bottle).

After the period of time, do the same routine again. Drain radiator and fill with clean, distilled water. Do this until the drain runs clear.

After this, fill radiator with new antifreeze/coolant (pre-mixed stuff is easier to use)...cycle system again, and keep filling and draining until you've put in enough antifreeze to equal the capacity of the system (whatever your manual says).

*This might sound complicated (or confusing), but it's very simple, and will leave you with a spotless coolant system.

 

[Korean_redneck]

quote:

---

Originally posted by New:
My experience with Gunk "10 Minutes" Radiator Flush.

It was the time to change the coolant and some leaking gasket, so I decided to do it myself. The car is 10 years old and no service records. I've got a can of Gunk "10 Minutes" Engine Flush, for a "total" flush.

Browsing the net I've encountered different opinions about keeping the thermostat in or not. I've decided to go for the flush without the thermostat to have the Gunk stuff flowing freely through the whole system.

So, I drained the old coolant, flushed with water and took out the thermostat housing. I've noticed a thin layer of white coating (most likely limestone deposits) on the inner surfaces of the housing. I wonder how the radiator internals look like! Here's where Gunk should work it's magic.

Next, I poured the Gunk stuff in, filled with water, ran the engine for 10 minutes then drained the mix out (by the book). I was expecting lots of debris out. But surprise, there was none! What the Gunk! The fluid was green and clear! Maybe the lime is dissolved in.

Flushed the system with two gallons of hot water. Took the thermostat housing out again only to admire again the nice white coating.

to cut the story short, my advice is: AVOID GUNK 10 MINUTES RADIATOR FLUSH!

New

---

What the Gunk! LOLOLL

 

[Matt_S]

The problem when you remove the thermostat is that the engine won't warm up. I would expect this to greatly reduce the effectiveness of the cleaner, as most of them perform only at operating temperatures. If you try this again with the thermostat, you may get a better result. Not perfect, probably, but better.