by Scott Fri Nov 26, 2010 12:01 pmWhen refilling the radiator how do you get the air out that's trapped in the heater core?
+2
G-Man
Scott
6 posters
Air in the Heater Core
Scott- Number of posts : 1651
Location : Anoka, MN
Age : 54
Registration date : 2008-05-20
G-Man- Mayor
- Number of posts : 30743
Location : Fowlerville, MI
Age : 62
Registration date : 2008-05-06
You have to let it run a while with the radiator cap off
Twinpilot001- Number of posts : 6186
Location : spokane ,Wa.
Registration date : 2009-09-28
Heres something -maybe some have not thought of=?? If the radiator has been lowered-for what ever reason?? mods & such=?? the air will never get out of the system. Top of radiator =MUST! be at a higher level than engine. Like some fords must have a seperate tank to fill the radiator-thats above the radiator- even some foreign cars made today have a bleeder valve in the system-where air gets trapped-just a thought.
savage- Number of posts : 2626
Location : Where Rust Never Sleeps in Ft Wayne IN
Registration date : 2008-05-15
Had this problem when I put 64 back together(after 7 years of being in parts). It's kind of a pain . I took both heater hoes off motor and hooked a garded hose to the 5/8(I think??)and filled (till it flows out of 3/4)core & hoese, then hooked it back up ,worked fine
m1dadio- Chevy Guru
- Number of posts : 1778
Location : north saanich
Registration date : 2008-10-06
The 2nd gen heaters I have seen have a blead port, a small metal tube with a cap and sometimes a valve on the end.
This is for bleading the air out of the heater.
anybody have a picture of the top side of a 2nd gen heater assy? Don?
M1d
This is for bleading the air out of the heater.
anybody have a picture of the top side of a 2nd gen heater assy? Don?
M1d
donivan65- Governor
- Number of posts : 12220
Location : San Diego, California
Registration date : 2008-05-12
m1dadio- Chevy Guru
- Number of posts : 1778
Location : north saanich
Registration date : 2008-10-06
So is that a 1st or 2nd gen core?
Maybe it only on Canadian vans I've seen it?
M1D
Maybe it only on Canadian vans I've seen it?
M1D
Scott- Number of posts : 1651
Location : Anoka, MN
Age : 54
Registration date : 2008-05-20
I checked my spare 2nd Gen. core and don't see a port.
m1dadio- Chevy Guru
- Number of posts : 1778
Location : north saanich
Registration date : 2008-10-06
Hmmmm!
I should have taken a picture, I've seen the blead port on two 2nd gen vans I looked at locally.
But your right, I've never seen a replacement core with a blead port.
I will work on that.
In the mean time. Sometimes a heater core gets the air forced out of it by momentarily pinching off one rad hose causing the water pump to force cerculation through the heater. But this bepends on how the cooling system it plumbed.
If you can see how the coolant is suposed to flow in your system you might figue which hose to pinch.
Usually the heater is used as a bypass while the thermostat is closed and it should purge during cold running time. The water pump genneraly sucks on the lower rad hose and the attached heater hose, and the heater hose coming off the intake of a V8 will be pushing coolant to the heater. In that case pinching the upper rad hose and giving the engine a little rpm to increase water pump eficiency should purge the heater.
The water pump makes poor flow at Idle, reving the engine a bit will make it flow.
how is your cooling system plumbing laid out?
m1D
I should have taken a picture, I've seen the blead port on two 2nd gen vans I looked at locally.
But your right, I've never seen a replacement core with a blead port.
I will work on that.
In the mean time. Sometimes a heater core gets the air forced out of it by momentarily pinching off one rad hose causing the water pump to force cerculation through the heater. But this bepends on how the cooling system it plumbed.
If you can see how the coolant is suposed to flow in your system you might figue which hose to pinch.
Usually the heater is used as a bypass while the thermostat is closed and it should purge during cold running time. The water pump genneraly sucks on the lower rad hose and the attached heater hose, and the heater hose coming off the intake of a V8 will be pushing coolant to the heater. In that case pinching the upper rad hose and giving the engine a little rpm to increase water pump eficiency should purge the heater.
The water pump makes poor flow at Idle, reving the engine a bit will make it flow.
how is your cooling system plumbing laid out?
m1D
donivan65- Governor
- Number of posts : 12220
Location : San Diego, California
Registration date : 2008-05-12
1st Gen cores lay on their sides, while 2nd Gens stand up for what they believe in,,,,,,,,,,
donivan65- Governor
- Number of posts : 12220
Location : San Diego, California
Registration date : 2008-05-12
So Scott,,,,,,,are you just asking this in case you ever find air in your heater core?????
Scott- Number of posts : 1651
Location : Anoka, MN
Age : 54
Registration date : 2008-05-20
Nope, just got to thinking about it when I reloaded the antifreeze. Now I'm just going to add as needed.
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