| 3/4 and 5/8 heater hoses why [message #341704] |
Thu, 14 March 2019 08:48  |
Tilerpep
Messages: 404
Registered: June 2013
Location: Raleigh, NC
Karma: 7
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Senior Member |
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Replacing all heater hoses...
Can someone explain why one stretch is 3/4, and most is 5/8?
And which one is flowing away from water pump?
I'm replacing the "Y" connectors to house water heater also, the part said 3/4 hose, but fits the 5/8 better and trying to figure out if the size matters as long as no leaks.
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC
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| Re: 3/4 and 5/8 heater hoses why [message #341719 is a reply to message #341704] |
Thu, 14 March 2019 18:22  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Tilerpep wrote on Thu, 14 March 2019 09:48Replacing all heater hoses...
Can someone explain why one stretch is 3/4, and most is 5/8?
And which one is flowing away from water pump?
I'm replacing the "Y" connectors to house water heater also, the part said 3/4 hose, but fits the 5/8 better and trying to figure out if the size matters as long as no leaks.
Tyler,
That is actually a very good question. And as it happens, I know the answer....
It was done that way in many vehicles by the OE so the hoses could not easily be reversed at assembly.
Not because the flow direction in the heater core matters. (Well, it does, but only a little in some cases.) But because those system with a control valve, the direction of the pressure (which isn't much) can matter a lot for the valve to truly stop the flow.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: 3/4 and 5/8 heater hoses why [message #341722 is a reply to message #341704] |
Thu, 14 March 2019 20:33 |
Scott Nutter
Messages: 782
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Senior Member |
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Matt..Thanks!!!
I've always wondered why also. But too afraid to ask..
You guys are awesome!!!!
Scott.
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
[Updated on: Fri, 15 March 2019 11:01] Report message to a moderator |
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