LT1 Coolant drain
Thread Starter
Drifting
Joined: Dec 2003
Posts: 1,491
Likes: 94
From: Westfield MA
LT1 Coolant drain
A friend of mine with a 92 LT1 asked me how to drain the coolant. He said he couldn't find a drain on the radiator, so I told him I would ask the question here. If it is on the radiator, can someone pinpoint the location?
Thanks
Thanks
Melting Slicks
Joined: Feb 1999
Posts: 3,261
Likes: 9
From: sonoma ca
The drain is located on the lower right side of the radiator. It is a petcock type ( Plastic) Shud have a couple of wings. Remove carefully.
http://www.diynetwork.com/diy/ab_aut...271299,00.html
http://www.diynetwork.com/diy/ab_aut...271299,00.html
Le Mans Master
Joined: May 2005
Posts: 7,310
Likes: 2,231
From: Central Maryland
On my '94, the radiator draincock is located a bit below the lower radiator hose.
To drain the coolant from the engine block, remove the knock sensors.
Be aware that there is a procedure for refilling the c/s on an LT1/LT4 engine in a Corvette. You'll need to bleed the air out of the system. On my '94 there's a bleed screw on the throttle body, and another on the thermostat housing.
Do not allow coolant to get down onto the Optispark, or you'll probably end up replacing it, too. Pack rags or towels around below the bleeder screws before you open them, to catch any coolant that gets out of them.
Be well,
SJW
To drain the coolant from the engine block, remove the knock sensors.
Be aware that there is a procedure for refilling the c/s on an LT1/LT4 engine in a Corvette. You'll need to bleed the air out of the system. On my '94 there's a bleed screw on the throttle body, and another on the thermostat housing.
Do not allow coolant to get down onto the Optispark, or you'll probably end up replacing it, too. Pack rags or towels around below the bleeder screws before you open them, to catch any coolant that gets out of them.
Be well,
SJW
Team Owner
Joined: Oct 2000
Posts: 96,443
Likes: 9
From: Fort Knox, KY
Cruise-In IV Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
Cruise-In VIII Veteran
If you don't want to remove the knock sensors, use a Shop Vac with blower capacity, remove the radiator cap, and put the hose over the UPPER coolant reservoir (the BLACK one not the WHITE overflow reservoir on the passenger side of the radiator.
The forced air will push all the coolant out of the system, including what's in the heater core. I just did a flush-and-fill last week on my '92 and it worked great. Saved a bunch of time, too.
Do this three or more cycles until you see nothing but clear water come out and then you'll KNOW all the old coolant's been evacuated.
The forced air will push all the coolant out of the system, including what's in the heater core. I just did a flush-and-fill last week on my '92 and it worked great. Saved a bunch of time, too.
Do this three or more cycles until you see nothing but clear water come out and then you'll KNOW all the old coolant's been evacuated.
Last edited by onedef92; Oct 21, 2005 at 03:59 PM.
