94 Siverado 5.0

[frankT]

Just purchased this truck to use on hobby farm and daily driver. Runs stops starts ok. Rad is completely filled with very rusty water. I installed a bottle Prestone rad flush, ran coupla days. Flushed, water lightened to weak tea color. Added another Prestone rrad flush ran coupla more days. Flushed water has color of exteremely weak tea. Changed lower rad hose and thermostat. Any thing else I should have or as I see sometimes good enough is just that good enough (added 1 gal Wm Tech and 1 gal 50-50 WM Tech (home brewed).Completed fill with distilled water. Suggestions? Dan

 

[bullwinkle]

I would have pulled the lower hose and block drain(s?) and blasted out the radiator & block with a hose-that's the only way to get the loose rust & silica drop-out out of there. My old '94 5.7 Suburban actually lost a water pump due to the cooling system being full of silica!

 

[jorton]

You may not need right now but if sparkplug wires or front flexible brake lines are original they should be replaced.

 

[Dakota1820]

I second the rubber brake lines to be replaced. I'd change every fluid and filter give her a good tune up and let her run as much [censored] as the 305 gets its actually a good engine just don't expect to hop it up. How many miles does it have?

 

[Chris142]

Originally Posted By: bullwinkle
I would have pulled the lower hose and block drain(s?) and blasted out the radiator & block with a hose-that's the only way to get the loose rust & silica drop-out out of there.
x2. The bottom of the water jacketsa must be loaded with junk.