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Old 12-13-2018, 06:38 PM   #1
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Location: Brevard County, FL
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Year: 1990
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Coolant line to heater: Which one goes to heater?

These are the coolant lines that run to the heater I removed approximately 10 months ago. I am ready to hook up my new heater. It specifies that the coolant travel in a certain way (inlet vs outlet).

Is there a way I can tell which one is to the heater? I don't see any specific markings. I assume that if I open either of them coolant will come out but that doesn't let me know which one is the feed.

6.6 liter New Holland diesel (1990)

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Old 12-13-2018, 06:46 PM   #2
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If yours is like mine, one of the lines can be traced to the vicinity of water pump. That should be the supply. A trick I used when plumbing my heater back in was to buy a length of clear vinyl tubing with the same ID from the local hardware store and to plumb it in where the heater core would be with a purge faucet.

It allowed me to see the progress of the bleeding and purging.

Something like that might help you as well.

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Old 12-13-2018, 07:00 PM   #3
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Join Date: Jan 2018
Location: Brevard County, FL
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Year: 1990
Coachwork: Bluebird
Chassis: Ford
Engine: 6.6 New Holland Diesel
Rated Cap: 60 kids, 10 window
Quote:
Originally Posted by david.dgeorge07 View Post
If yours is like mine, one of the lines can be traced to the vicinity of water pump. That should be the supply. A trick I used when plumbing my heater back in was to buy a length of clear vinyl tubing with the same ID from the local hardware store and to plumb it in where the heater core would be with a purge faucet.

It allowed me to see the progress of the bleeding and purging.

Something like that might help you as well.

Attachment 28155
Thank you, that is a great idea.
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