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[LS1] Coolant drain plug

H1GHROLLR

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hi people does anyone know where the coolant drain plug is to drain the

block on the ls1. . .just taking of the bottom hose wont empty the block

will it??
 

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which hose did you take off mate there are heaps of hoses where abouts is it
 

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which hose did you take off mate there are heaps of hoses where abouts is it
The heater hose, on the right hand side of the motor. It's a 3/4" hose i think from memory. Doing that means you also get the extra coolant that will be in the heater too so that's why i do it that way.
 

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ok yeah and do you take the bottom radiator hose off too
 

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really want to find that drain plug in the block
 

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ok yeah and do you take the bottom radiator hose off too
Certainly do. Flush when the bulk of the coolant is drained. Put the garden hose on the heater hose and flush, then reverse the flush by putting the garden hose on the block where you took the heater hose off.
 

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cheers mate
 

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I think the block plug is on the passenger side if you want to go that way, down the bottom half way along. I only go the other way to get all the coolant out of the heater. It can be a real bitch to get the air out of the system too once you replace the coolant.
 

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i have always just left the cap off and let it bubble
 
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