Well the Jimmy's starting to overheat irradically again.
I've replaced just about everything in the cooling system within the last year (stat, "Stant" brand rad cap, water pump, radiator) and flushed it recently. Even after that thorough flush about 5 months ago, I recently noticed sludge floating around in the overflow reservoir. Sometimes the truck will run fine and sometimes it will run too hot. I always shut it off if it goes about 1/2 on the temp gauge. Anyhow, I think that the irradic overheat is caused by a large chunk of rust/scale/sludge/gunk getting
stuck periodically - usually in the thermostat or in the heater core.
Anyways, there were some previous posts about acid-flushing a system. I can't seem to find any acid-based flush products at Autozone, Advance, O'Reilly, etc. Is an acid-flush something that a do-it-your-selfer can do? I've heard an acid-flush is primarly oxalic acid. Is there a name-brand acid flush product?
Any negative thoughts on acid flushing?