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Discussion Starter #1
Gave it the 1/4 turn. Can't get it out.

I want to change out the coolant, it's long over due.
'04 Z06 80,000 miles.
This will be the first coolant change.


Thanks for any help.
 

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DC PIT CREW BOSS
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36,390 Posts
I was thinking about the same thing about my '04 too. If you find out any little secret let me know
 

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Discussion Starter #3
I was thinking about the same thing about my '04 too. If you find out any little secret let me know

The drain plug has a small metal pin at the 3 o'clock position that is in a small groove to a slot. Turn counter-clockwise a quarter turn to line the pin up with the slot. I then used a small screwdriver to get it started and it popped right out.

Drain.
Fill with distilled water.
Run up to temp.
Cool down.
.....I repeated drain refill 3 times, until it ran clear.

Dex-cool and distilled water 50/50 mix.


Car runs 10-15 degrees cooler.
 

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4,705 Posts
It always sucks when you have to sell your customer a new radiator because the drain wont seal and it wasn't leaking when it came in. I am pretty sure most techs in the field will say they just pull the lower rad hose to drain the cooling system. I sure know that's what I do. especially on the plastic stuff.
 
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