GMT 800 & Older GM General Discussion 2006 & Older Trucks | General Discussion

Heater Core Hose size, is it 5/8 or 3/4?

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Old Nov 14, 2012 | 04:40 PM
  #11  
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I got 5/8" hose but haven't installed them yet, so I can't confirm that it's the correct size.
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Old Nov 14, 2012 | 04:52 PM
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Originally Posted by Ferocity02
I got 5/8" hose but haven't installed them yet, so I can't confirm that it's the correct size.
I'm 99% it's 5/8".
If Corey responded to his PM's, he'd have the info.
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Old Nov 14, 2012 | 06:01 PM
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I have a gauge for that
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One of them is completely 5/8"

The other one is that Y piece...from the pump to the y is 3/4", from one end of the y to the heater core is 5/8" and from the other end of the y to the coolant tank is 1 1/16 I believe.
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Old Nov 14, 2012 | 11:45 PM
  #14  
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Originally Posted by Atomic
One of them is completely 5/8"

The other one is that Y piece...from the pump to the y is 3/4", from one end of the y to the heater core is 5/8" and from the other end of the y to the coolant tank is 1 1/16 I believe.
Does the 5/8 hose going from the Y to the heater core come out of the Y? I tugged on it and it seems firmly in place, so I bought a 5/8 hose mender fitting instead.
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Old Nov 14, 2012 | 11:55 PM
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Yes. 3/4 on the single side, 5/8 and 1 1/16 on the split end.
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