how to flush radiator ?
Pro
Joined: Aug 2005
Posts: 630
Likes: 2
From: BEMIDJI MN
I have never actually flushed mine. I just let it cool down and drain the coolant. I then fill it with water start it up let it run a few minutes long enough to open up the thermostat then turn it off and drain again. I did this I think twice until the liquid that was expelled was clear. I then put in the required amount of coolant and water. Seemed to work for me.
Le Mans Master
Joined: Mar 2004
Posts: 8,700
Likes: 298
From: Ft. Lauderdale Fl
Originally Posted by tbone42
So on my 90 whats the best wat to flusy the rad just checked the green stuff and only good for 5 below and don't know when it was changed last. Thanks guys 
Tbone
Tbone
Melting Slicks
Joined: Nov 2005
Posts: 2,143
Likes: 488
From: Leonardtown Maryland
Originally Posted by Billy Stargazer
I have never actually flushed mine. I just let it cool down and drain the coolant. I then fill it with water start it up let it run a few minutes long enough to open up the thermostat then turn it off and drain again. I did this I think twice until the liquid that was expelled was clear. I then put in the required amount of coolant and water. Seemed to work for me.
Le Mans Master
Joined: Aug 2004
Posts: 5,141
Likes: 7
From: Metairie Louisiana
First thing I did was to drain the coolant at the petcock valve on the bottom of the radiator so I didn't have coolant all over the driverway. Next I left the petcock valve at the bottom of the radiator open and put a hose into the tank by the firewall. I let the water run with the engine running and the heater on until all I saw was crystal clear water exiting at the bottom of the radiator. I repeated this several times because it was fairly dirty/rusty looking. It took a couple of hours to get it really clean. I then started to fill with my 50/50 mix unitl I saw it coming out the bottom of the radiator, then I quickly caped the petcock off. I continued to fill it until the firewall resivoir was almost full. I then used the bleed valve on the water neck to burp the air out with the engine running. This is probably not the textbook method but it worked great. Make sure you have someone keep an eye on your eninge temps during the process to be safe. You don't want it running too long at any point without coolant or water in it.
Last edited by rickneworleansla; Oct 20, 2006 at 12:21 PM.
Safety Car
Joined: Sep 2002
Posts: 4,971
Likes: 9
From: The reason time exists is so everything doesn't happen at once
Originally Posted by rickreeves1
First thing I did was to drain the coolant at the pebcock valve on the bottom of the radiator so I didn't have coolant all over the driverway. Next I left the pebcock valve at the bottom of the radiator open and put a hose into the tank by the firewall. I let the water run with the engine running and the heater on until all I saw was crystal clear water exiting at the bottom of the radiator. I repeated this several times because it was fairly dirty/rusty looking. It took a couple of hours to get it really clean. I then started to fill with my 50/50 mix unitl I saw it coming out the bottom of the radiator, then I quickly caped the pebcock off. I continued to fill it until the firewall resivoir was almost full. I then used the bleed valve on the water neck to burp the air out with the engine running. This is probably not the textbook method but it worked great. Make sure you have someone keep an eye on your eninge temps during the process to be safe. You don't want it running too long at any point without coolant or water in it.
