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Learn2 Flush a Car Radiator (continued)
Step 7: Rinse the radiator

Oddly enough, the actual rinsing of the radiator is the easiest part of the entire operation. Your garden hose does all of the work--you just pay attention to the color of the rinsing water as it leaves the radiator.

  • Take the garden hose and insert it into the fill spout.
  • With the petcock closed, fill the radiator until full. Then open the petcock and drain it once again. Important: collect this first rinse and dispose of it in the same manner as the drained coolant. That is, add it to the disposal containers that you have for Step 6.

  • If the drained water is clear, close the petcock and move onto Step 8. If it appears rusty, continue filling and draining until the water is clear. After the first flush, it's all right to let the rinse water drain on to the street.
  • Close the petcock.


Alternate Step 7: Rinse and replace a hose

Have you removed the bottom hose to replace it? Don't put the new one on until you've rinsed out the radiator. In this case, you want to rinse the radiator with the petcock always closed. (If you're replacing a top hose, go ahead and replace the hose and follow the procedure described above).

  • Hold your gloved hand over the hole on the radiator where the bottom hose attaches.
  • Fill the radiator with the hose.
  • Release your hand quickly. The water will gush out and any rust or mineral deposits will escape through the larger opening of the hose. Repeat this until the water runs clear.
  • Replace hoses and clamps as needed. Fortunately this is a simple matter--just unscrew the old clamps on both ends of each hose, and the hoses come right off. And installling the hoses is the same motions in reverse.

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Step 1: Clean the radiator front and fan
Step 2: Place the drain pan
Step 3: Remove the radiator pressure cap
Step 4: Inspect the radiator pressure cap
Step 5: Inspect the clamps and the hoses
Step 6: Drain the radiator
Step 7: Rinse the radiator
Step 8: Add the coolant mixture
Step 9: Bleed the system
Step 10: Replace the radiator pressure cap
Step 11: Clean up


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