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Old 07-31-2011, 08:50 AM   #1
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Question Green shade tree mechanic

Not a mechanic,but would like to flush the radiator. do I open the drain plug then take off both hoses . Also do I need to use a water hose to shoot down into the radiator to flush? Had also posted back on 7-29-11 about the bestop replacement window kit, Any comments? Thank-you

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Old 07-31-2011, 10:22 AM   #2
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If you just want to flush the radiator open the drain plug and open the radiator cap. This will be enough to flush the radiator. You can use water to shoot into the radiator to flush it out.

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Old 07-31-2011, 11:26 AM   #3
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  1. Get the jeep to operating temp
  2. drain the fluid and dispose of properly (some places its legal to dump donw your house drain)
  3. fill with tap water
  4. run the jeep for a few minutes until the upper hose is hot. Have the heater on full blast.
  5. Turn it off, and drain the fluid.
  6. Fill with tap water and get to operating temp again.
  7. By this point the fluid should be looking more like water. I usually drain it on the street at this time. Check your local laws first!
  8. Leave the engine running and open the petcock while you add hose water to the top of the radiator so it doesn't get lower.
  9. Do that unitl the fluid looks just like water.
  10. Shut it off and drain the water.
  11. Fill with DI / distilled water
  12. Run to temp with heater on full.
  13. drain and refil with 50:50 coolant mix, or mix it yourself and save $
  14. Sometimes I do 2 DI water flushes before I put the coolant back in.
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Old 08-01-2011, 05:15 PM   #4
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thanks for the replies,that second one got a little lenghty but I am sure it will be clean as a whistle.
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Old 08-01-2011, 07:00 PM   #5
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Quote:
Originally Posted by jgorm View Post
  1. Get the jeep to operating temp
  2. drain the fluid and dispose of properly (some places its legal to dump donw your house drain)
  3. fill with tap water
  4. run the jeep for a few minutes until the upper hose is hot. Have the heater on full blast.
  5. Turn it off, and drain the fluid.
  6. Fill with tap water and get to operating temp again.
  7. By this point the fluid should be looking more like water. I usually drain it on the street at this time. Check your local laws first!
  8. Leave the engine running and open the petcock while you add hose water to the top of the radiator so it doesn't get lower.
  9. Do that unitl the fluid looks just like water.
  10. Shut it off and drain the water.
  11. Fill with DI / distilled water
  12. Run to temp with heater on full.
  13. drain and refil with 50:50 coolant mix, or mix it yourself and save $
  14. Sometimes I do 2 DI water flushes before I put the coolant back in.
That is an extremely long, complicated, and unnecessary procedure for flushing the system. Not to mention running the heater on full blast does absolutely nothing.

OP, drain the radiator, remove lower hose and heater hose connected to the water pump, shoot water into heater hose and watch it come out the lower rad hose.

Catch and dispose of all fluid. If your connected to city water/sewage it's a safe bet you can dispose of everything down the toilet. If you use a septic tank you'll have to take the fluid somewhere that will dispose of it properly.
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