coolant flush?
Pro
Joined: Nov 2006
Posts: 545
Likes: 0
carefully
1993 Ruby LT1 8200 mi.
Remove rad cap / open rad drain / remove knock sensors at oil pan.
Stuff lotsa rags between water pump /opti spark distributor and block.
and gently,low pressure flush system until running clear.
Open bleeder valves at thermo housing both sides and refill until full,close bleeders as soon as possible.
Did this with mine and had virtually no air bubbles and didn't even have to top it up later
Remove rad cap / open rad drain / remove knock sensors at oil pan.
Stuff lotsa rags between water pump /opti spark distributor and block.
and gently,low pressure flush system until running clear.
Open bleeder valves at thermo housing both sides and refill until full,close bleeders as soon as possible.
Did this with mine and had virtually no air bubbles and didn't even have to top it up later
Last edited by kenmack; Jun 24, 2009 at 02:53 PM.
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
disconnect KS
place a container underneath the KS
using a 22mm socket, remove both KS
you'll get better drainage if you let the car rest at normal height
If you choose not to remove the KS, you'll only flush the radiator and hoses. Most of the "junk" rests at the bottom of the block.
Take the time and do it right
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
Thread Starter
Racer
Joined: Sep 2008
Posts: 263
Likes: 12
From: k-town
I was under the car the other day, going to flush the coolant out, I think I found the knock sensor it's on the left side just above the oil pan about middle, this right? Is there another knock sensor other than that one? When I pull it out and reinstall it should use any type of sealant, on the threads of the knock sensor? I don't want it to leak!
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Thread Starter
Racer
Joined: Sep 2008
Posts: 263
Likes: 12
From: k-town
I was under the car the other day, going to flush the coolant out, I think I found the knock sensor it's on the left side just above the oil pan about middle, this right? Is there another knock sensor other than that one? When I pull it out and reinstall it should use any type of sealant, on the threads of the knock sensor? I don't want it to leak!
Race Director
Joined: Dec 2006
Posts: 10,383
Likes: 4
I was under the car the other day, going to flush the coolant out, I think I found the knock sensor it's on the left side just above the oil pan about middle, this right? Is there another knock sensor other than that one? When I pull it out and reinstall it should use any type of sealant, on the threads of the knock sensor? I don't want it to leak!
Thread Starter
Racer
Joined: Sep 2008
Posts: 263
Likes: 12
From: k-town
Thanks for the info.
Drain the rad. / remove the two knock sensors. Bought some peak coolant, and distilled water, mixed 50/50 filled and open bleeder valve on housing it seemed to have no air! Easy job
Drain the rad. / remove the two knock sensors. Bought some peak coolant, and distilled water, mixed 50/50 filled and open bleeder valve on housing it seemed to have no air! Easy job
Intermediate
Joined: Feb 2009
Posts: 40
Likes: 0
From: Panora IA
Whatever you do or how you do it, replace the stat and try to clean the radiator. See other threads related to that. I flushed my system and it increased coolant temp to the 230s. It turned out the stat and cleaning radiator outside was the trick.
