It's time for a new water pump in my 04. When I had my 1997 vortec, I had a very neglected cooling system. I mixed and ran citric acid in the cooling system to help get the rust out (heater core lines clogged with rust scale). Then a clear water rinse, followed by TSP to get the Dexcool sludge out. Then a clear water rinse, and disassemble. Once the pump was off I sprayed the hose directly in the block to loosen more sludge then compressed air to get as much water out as I could and reassemble.
I am not as familiar with the 04 system. I don't seem to have a rust problem, but is there an issue running water and TSP? Can I connect the heater core hose flush fitting on this system?
I am not as familiar with the 04 system. I don't seem to have a rust problem, but is there an issue running water and TSP? Can I connect the heater core hose flush fitting on this system?