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Draining Radiator & Replacing Coolant

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Old May 1, 2008 | 07:07 AM
  #1  
deyjason's Avatar
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Default Draining Radiator & Replacing Coolant

'97 ex, I am a little unsure about how to change out my coolant because of reading issues on this board. The owners manual basically just says to drain it, empty the overflow, then refill the radiator and overflow. It does not make any mention of a bleeder valve or bleeding the system at all. Several of the forums I've seen says if you don't bleed the system you will get air trapped and will cause other problems..
Is there a bleeder valve for the cooling system on my car and if so where? Should I bleed it? How do I bleed it?
 
Old May 1, 2008 | 09:08 AM
  #2  
beeguz's Avatar
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Default RE: Draining Radiator & Replacing Coolant

As long as you run the car with the radiator cap off after you put the new juice in the air will take care of itself, just don't fill the radiator to capacity, leave it a little low, that way the air won't push out your new juice, and after the car has been running and comes up to temp, before you close the system add juice untill you can see it.

Then fill the reserve bottle to the cold mark, and after a day or two check the bottel and fill to where needed.

I would recomend useing a 5 year antifreeze like dexcool, it's better for the aluminum in the engine
 
Old May 1, 2008 | 11:11 AM
  #3  
mk378's Avatar
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Default RE: Draining Radiator & Replacing Coolant

If you have a bleeder valve, it will be on the fitting on the engine that connects to the top radiator hose.

To refill, fill the radiator all most all the way up with the bleeder valve open if you have one. Then close the valve but leave the radiator cap off. Start the engine. Immediately after starting the engine, fill the radiator to the top. Keep adding to keep it full. Do not run the engine while you can't see coolant in the radiator. When it starts to overflow (which will occur long before the engine is at operating temperature), put the cap back on. Make sure the bottle is at least half full. Warm up the engine fully, watching carefully that it doesn't overheat, and then stop it and let it cool down fully. Once cold, open the radiator and make sure it is still full, add some if needed. Adjust the level in the bottle should be between the lines.

The cabin heater should be on full hot during this entire procedure to purge air out of the heater core and lines.
 
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