ive been using that dex cool sh*t and am getting sick of looking at the ugly brown build-up in the radiator and resevour.
what is the best way of flushing the system i bought that yellow tubing kit from autozone but cannot connect it becouse there is no room. if anyone has accomplished this please post how you did it.
also does any one know how to get out the stains in the resevour and remove the built-up in the radiator?
why would GM put thier name on this mud?

 

I use that new long life GM type coolant, I think it was made by Prestone or Havoline and I don't have any brown build up, had it for 2 years and it's as clean as the day I put it in, maybe you have a small head gasket leak that's contaminating the coolant, but back to the topic, I like to flush the system by taking out the thermostat and then putting the housing back on with the hose still attached, disconnect the upper rad. hose from the radiator, stick a garden hose in the radiator and turn it on full, start the engine, turn on the heater, all the fresh water will flow through the radiator, then the engine and out the upper hose, flush till it comes out clean and then some more, then just put back the stat, reconnect the upper hose and drain the radiator, fill with anti-freeze of choice.

 

just make sure u flush for a long time. cause you wanna get ALL that dex cool crap out of there.. so u might wanna flush it while the engine is running to help get even more crap out of there..

 

Texaco, who designed the OAT coolant for GM recommends that in a conversion from conventional ethelyene glycol to completely flush the system fill with the proper mixture of Dexcool and run the vehicle two weeks. Then repeat the procedure with a flush and a refill. They recommend no more than a 10% residual amount of the green stuff in order to get any benefit from the extended drain. Ironically they also state that if the car was not originally equipped with Dexcool to maintain the 2 year conventional service interval. I did my change after extensive work where I replaced the rad, heater core and all hoses including the heater valve. The brown residue develops generally when the coolant level is low and if there is a slight overheating condition and it starts to cook. To clean it you will probably need to use on of those chemical flushes that you put in and drive it. Did you use distilled water with the Dexcool? I have converted several cars and my sportbikes over to it and so far have not had a problem. It's a split decision with dealer mechanics. Even the people who hate it admit that generally when they see a problem with Dexcool it's because of another issue. GM invested in this technology in an effort to work with the EPA to try to achieve longer drain intervals and develop a more enviornmentally friendly alternative as well as something more friendly to cooling components. Who knows.