How do I flush my cooling system?

[98sierra4x4]

I'm putting a new rad in my truck and am wondering if I should flush it and if so how do I flush the coolant?


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[kennythewelder]

Preston makes a flush kit that installs on the heater hose. I have used these kits for years, and they do a decent job. You can find these at your local auto parts store. The instructions come with the kit.

 

[454cid]

If the heater core returns to the radiator in your truck, skip the Preston kit..... it will only flush the heater core. What I do is disconnect, and extend the upper hose at the radiator, and pull the thermostat. I then run the engine keeping the radiator full with the hose.

 

[98sierra4x4]

Ok thanks


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