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Old 08-23-2021, 01:38 PM   #1
Mini-Skoolie
 
Join Date: Mar 2021
Location: New York City
Posts: 11
Year: 2002
Coachwork: Blue Bird
Chassis: All American
Engine: Cummins 5.9
Can I use 2 different sizes of heater hose?

I'm rerouting my coolant line under my bus and currently the system is using 1" but I would like to mend in 3/4 for the two 30ft runs under the bus.

Would this cause pressure issues or cause air bubbles?

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Old 08-23-2021, 04:49 PM   #2
Bus Crazy
 
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Join Date: Sep 2017
Location: Swansboro,NC
Posts: 1,735
Year: 86
Coachwork: Thomas
Chassis: Ford B700
Engine: 8.2
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do you have a pump to move the coolant?
either way i dont think it would cause to much issue other that your heater wont get as much flow as it used to.
example 1" pipe carries 12 gpm and 3/4" pipe carries 9 gpm.
notice i said example because there are variables that factor in for specific fluid,pressure and bends ,turns, heater connections, heater core itself but at a minimum in a perfect world your heater will not be as efficient as it was.
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Old 08-23-2021, 05:10 PM   #3
Mini-Skoolie
 
Join Date: Mar 2021
Location: New York City
Posts: 11
Year: 2002
Coachwork: Blue Bird
Chassis: All American
Engine: Cummins 5.9
Quote:
Originally Posted by Jolly Roger bus 223 View Post
do you have a pump to move the coolant?
either way i dont think it would cause to much issue other that your heater wont get as much flow as it used to.
example 1" pipe carries 12 gpm and 3/4" pipe carries 9 gpm.
notice i said example because there are variables that factor in for specific fluid,pressure and bends ,turns, heater connections, heater core itself but at a minimum in a perfect world your heater will not be as efficient as it was.
The hope is that a lessened flow would not be an issue because less parts are being serviced but then again those heaters were dispelling heat, even off. so the coolant would theoretically be hotter.
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