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Old 09-16-2005, 09:07 PM   #1
tnblazerk5
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heater hose ?s

where does the heater hose from the rad go to (just put 4 core in and old rad didnt have this on it )? heater core top or bottom ?
if so do i block off the water pump or the intake ?
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Old 09-16-2005, 09:27 PM   #2
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You can run either the radiator or the waterpump for the 3/4 hose. The 5/8 will still go to the intake. The heater core should tell which way to go, the smaller of the two will go to the intake. Actually you cant really hook up the hoses wrong on the core...
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Old 09-16-2005, 09:28 PM   #3
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Radiator to top heater (3/4" = larger hose).

Lower heater (5/8" = smaller) to control valve on inner fender, then to intake -

Water pump blocked -

This is on my stock '72 with A/C. Hope this helps!

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Old 09-16-2005, 09:45 PM   #4
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if you had stayed in florida you wouldn't need a damn heater !!!!!
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Old 09-16-2005, 11:23 PM   #5
da-burb
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"Actually you cant really hook up the hoses wrong on the core..."

But someone could have put the heater core in up-side-down. Correct is 3/4" @ top, 5/8" @ bottom on a non-A/C truck.
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Old 09-17-2005, 12:07 AM   #6
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Can coolant really go the wrong way through a core?
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Old 09-17-2005, 01:06 AM   #7
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Quote:
Originally Posted by da-burb
Correct is 3/4" @ top, 5/8" @ bottom on a non-A/C truck.
And, as noted in my post above, also in an A/C truck.
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Old 09-17-2005, 05:32 AM   #8
tnblazerk5
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Quote:
Originally Posted by cdowns
if you had stayed in florida you wouldn't need a damn heater !!!!!
i used to live down there missed the mountains had to move back here
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Old 09-17-2005, 05:33 AM   #9
tnblazerk5
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oh yea thanks for the input everybody
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Old 09-17-2005, 09:10 AM   #10
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Quote:
Originally Posted by cornfed63
Can coolant really go the wrong way through a core?
probaly just a gravity thing travels down alot easier..$0.02
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Old 09-17-2005, 03:26 PM   #11
tnblazerk5
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well as things would have it the heatercore is in upside down lol i have no clue to what i was thinkin back then the last time i changed it was about 15 to 18 years ago hhhmmmm i may need to look at the heater core and see if its still ok

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Old 09-17-2005, 05:38 PM   #12
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I recently had almost the same questions. Turns out I had them backwards, not that it made a big difference, I wanted it to look right.
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