OK, things i have done so far. I bought the car, it seemed to have more water than coolant in it so i did the following. I had the radiator rotted and corded, replaced the upper and lower radiator hoses. I have replaced the water pump. I have flushed the radiator about 6 times and for some reason the rest keeps coming back !!! I have not replaced the heatcore, plus it doesnt work. So thats next on the list. Could this be holding some rust in it and recircutlating it into the system? Could there be a leak in the radiator allowing tranny fluid into the coolant some how? Or should i look for a chemical to flush it with cause my block is probably the place the rust is? Thanks for the help

Matt
91 formula

 

there is a chemical flush stuff u can buy to do what you want to do... prolly just rust build up i the water passages... get the chemical flush and u should be fine... i also have to do the same thing with mine.

 

There is a prestone kit that you can buy from the parts store that is two parts, one is an acid that disolves the rust and corrosion, the second part is a nuetralizer for the acid. This take a couple hours to do but is very effective, GM recomends this for the jimmys that look like they have mud in them and its the only thing that ive ever used that works

 

Hey guys, has anyone heard of Zerex by Valvoline? They have a cleaner, don't remember what it is exactly, and a flush kit. I bought both, because I didn't see the Prestone thing. Just curious if this works too...thanks