Engine Block Drain Plugs??
Thread Starter
Heel & Toe
Joined: Apr 2024
Posts: 20
Likes: 3
Engine Block Drain Plugs??
TLDR: Where is the passenger-side engine block coolant drain plug?
Hey everyone. I'm new to the whole Corvette scene with my 1985 Corvette, also being my very first car.
I'm doing a full coolant flush on my car because I just know it hasn't been done in decades. It's full of junk, aside from being at a dangerously low level.
I got my hands on the '85 FSM and it says to open up the engine block drain plugs for a more thorough flush than just flushing the radiator. Unfortunately, my first experience with the FSM isn't so nice as the manual never seems to make mention of the block drain plugs again, anywhere. I have no idea where they would be. I assume there are two for both sides of the engine block. I found one of them, cracked it open and had to stick a brush up there to remove the gunk before the coolant started to flush out.
Now for the life of me, I can't find that other drain plug (on the passenger side) I've been looking for nearly an entire day and found nothing.
Where could it be? If anyone has pictures too, that would help me so much. Thanks!
Hey everyone. I'm new to the whole Corvette scene with my 1985 Corvette, also being my very first car.
I'm doing a full coolant flush on my car because I just know it hasn't been done in decades. It's full of junk, aside from being at a dangerously low level.
I got my hands on the '85 FSM and it says to open up the engine block drain plugs for a more thorough flush than just flushing the radiator. Unfortunately, my first experience with the FSM isn't so nice as the manual never seems to make mention of the block drain plugs again, anywhere. I have no idea where they would be. I assume there are two for both sides of the engine block. I found one of them, cracked it open and had to stick a brush up there to remove the gunk before the coolant started to flush out.
Now for the life of me, I can't find that other drain plug (on the passenger side) I've been looking for nearly an entire day and found nothing.
Where could it be? If anyone has pictures too, that would help me so much. Thanks!
Melting Slicks
Joined: Nov 2016
Posts: 2,237
Likes: 3,063
From: So Cal
2023 C4 of the Year Finalist - Unmodified
If you have the same 1985 FSM that I have, there is a picture of the location of the knock sensor on the passenger side on Page 6E3-107. Section 6E is Driveability and Emissions Fuel Injection (Port).
Melting Slicks
Joined: May 2019
Posts: 3,181
Likes: 1,376
From: Mid-Atlantic
2025 C4 of the Year Finalist - Unmodified
2023 C4 of the Year Finalist - Unmodified
2022 C4 of the Year Finalist - Unmodified
2021 C4 of the Year - Unmodified Finalist
