Bypass Heater Core
Thread Starter
1st Gear
Joined: Feb 2017
Posts: 1
Likes: 0
From: NC
Bypass Heater Core
Can someone here please help me? I just bought my first C4 today and I am trying to bypass the heater core, as I know it is in need of replacement. I bought the 3/4" to 5/8" piece to connect the hoses. However, I still have a small run of coolant coming out of one of the pipes from the heater core. I have done this before previously with a '91 Z-71. What am I doing wrong here? Please help. I've heard jokes already, just looking for help. Thanks.
Chuck Berry (Totally floored with a C4... LOL)
Chuck Berry (Totally floored with a C4... LOL)
Last edited by Chuck Berry; Feb 7, 2017 at 11:32 PM.
Burning Brakes
Joined: Nov 2016
Posts: 761
Likes: 79
From: Buchanan GA
Can someone here please help me? I just bought my first C4 today and I am trying to bypass the heater core, as I know it is in need of replacement. I bought the 3/4" to 5/8" piece to connect the hoses. However, I still have a small run of coolant coming out of one of the pipes from the heater core. I have done this before previously with a '91 Z-71. What am I doing wrong here? Please help. I've heard jokes already, just looking for help. Thanks.
Chuck Berry (Totally floored with a C4... LOL)
Chuck Berry (Totally floored with a C4... LOL)
Team Owner
Joined: Jul 2004
Posts: 28,462
Likes: 3,288
From: Hartford WI
Can someone here please help me? I just bought my first C4 today and I am trying to bypass the heater core, as I know it is in need of replacement. I bought the 3/4" to 5/8" piece to connect the hoses. However, I still have a small run of coolant coming out of one of the pipes from the heater core. I have done this before previously with a '91 Z-71. What am I doing wrong here? Please help. I've heard jokes already, just looking for help. Thanks.
Chuck Berry (Totally floored with a C4... LOL)
Chuck Berry (Totally floored with a C4... LOL)
According to you, the core is bypassed. If it wasn't, it won't be a small run. The only thing I can think of is someone is trying to "gaslight" you or it is residual coolant. If you don't know, I would flush the core with water. I have dogs around so I am sensitive to coolant since it can cause problems in animals. Also if there is coolant after you flush it, you need to investigate it.BTW, why did you bypass it originally? I don't think it can pool up in the heater box and come back.
Safety Car
Joined: Aug 2013
Posts: 4,429
Likes: 605
From: Minneapolis Mn
If the hoses were taken off the core and looped together there should be no way any new coolant can get to the core, only residual coolant. Try taking a short piece of hose to one heater core connection and hook an air source to it and another piece of hose to a bucket and see if you can blow out as much of the residual coolant out of the core as you can.
Based on pictures of the heater core, the connectors are on top so there's a good chance that there is coolant still in it once the hoses are removed. Might even be able to syphon out the fluid to some extent if you're good or lucky.
Based on pictures of the heater core, the connectors are on top so there's a good chance that there is coolant still in it once the hoses are removed. Might even be able to syphon out the fluid to some extent if you're good or lucky.
Last edited by hcbph; Feb 8, 2017 at 02:32 PM.
