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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 11-11-2010   #1 (permalink)
newtoponys is offline Made Member


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Default Flushing heater core

Hi All,

I have watch lots of videos on flushing core, but a little confuse on which hose is in and or out. I cant determine by touching because it don't run yet.

There is a long hose to water pump and a shorter one to top of intake manifold, but I get conflicting information from INTERNET and shop manual, not very good at understanding words better at watching.

I fill this will be the least of my problems but I wont know until I start her, but I think flushing it is a good idea at this point.

Thanks All take care,

Dion
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1967 Convertible

1:Energy is equal to desire and pupose:
2:Only you can change you life. No one can do it for you:
3:Fall down seven times, stand up eight time:
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Unread 11-11-2010   #2 (permalink)
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It makes no difference which is in or out if your flushing a core.
Hook a hose to one side of the core and over the side of the car, put a garden hose to the other side, turn on hose, run water until clear, disconnect. Should take about 3 seconds.
Heater core is something like a small radiator, it doesn't mater which way water comes in or goes out, because there is no tank, water just goes by the fins.
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Unread 11-11-2010   #3 (permalink)
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The general idea in flushing is back flushing the heater core, the bottom hose should go to the intake it is the inlet to the heater core, and the top hose on the core is the outlet and goes to the water pump, do not use much pressure when you flush as you can damage the heater core, I always take the hoses off the intake and the water pump, and use a short piece of 5/8" copper pipe to connect the heater hoses to a chopped off piece of garden hose, I usually flush the back dir first ( which is to connect the garden hose to the hose that ran to the water pump) then when it runs clear, switch to the other dir, do this several times, until both dir run clear, this will not completely clean out the heater core, because of the mineral deposits are too hard, but it will flush out rust, crude, etc that can restrict the core. If the core is very old it might be a good idea to replace it, they will start to seep at a corner long before you notice they are leaking. Good Luck.
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Unread 11-11-2010   #4 (permalink)
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Dion,

I think I would go would Rex and replace the heater core, there only between 40 and 50 dollars, and now would be the time to do it while the cars apart and your working on it. Much better than it starting to leak onto your brand new carpet later on.

Terry
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Unread 11-12-2010   #5 (permalink)
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Hi Terry,

I did not go with a heater core from CJPonys I went to AutoZone,
it was $19.99, the old core does not look bad I will take it down and get it tested if it passes I will have a spare,
I was amazed how easy it was to get out.

Thanks all for the info.

Take care,

Dion
__________________
1967 Fastback 289
1967 Coupe S Code ( its on my land but its my step-dads)
I would like:
1967 Convertible

1:Energy is equal to desire and pupose:
2:Only you can change you life. No one can do it for you:
3:Fall down seven times, stand up eight time:
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Unread 11-12-2010   #6 (permalink)
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Quote:
Originally Posted by newtoponys View Post
I was amazed how easy it was to get out.
You must no have air conditioning.
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Unread 11-15-2010   #7 (permalink)
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Hi Ivy66,

I would like to have a/c in the car, ( I might look into that someday) so by your comment it must be a b*** to take out heater core if a person has a a/c.

Take care,

Dion
__________________
1967 Fastback 289
1967 Coupe S Code ( its on my land but its my step-dads)
I would like:
1967 Convertible

1:Energy is equal to desire and pupose:
2:Only you can change you life. No one can do it for you:
3:Fall down seven times, stand up eight time:
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Unread 11-15-2010   #8 (permalink)
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sounds like you have got it made, without the a/c, there is really no excuse to not replace the heater core when it is clogged and flushing would be a pain.

Good luck with future problems, they never stop
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Unread 11-15-2010   #9 (permalink)
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Quote:
Originally Posted by newtoponys View Post
...it must be a b*** to take out heater core if a person has a a/c.
Yes.

Earlier models or a non-A/C '67 are much easier than a '67 with air. They built heat and cooling all together as a single unit. A better idea, possibly, unless you need to take out the heater core.

Never owned a later year so can't comment about them.
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