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Old 06-14-2013, 04:39 PM   #1
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Heater shut off valves

1986 bluebird w a hurri hot system. The previous unit in the back of the bus was heater and ac. There are 4 hoses on the back. Are the smaller diameter hoses the heat and the larger ones the ac? I just want to install a heater. No ac.
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Old 06-14-2013, 04:55 PM   #2
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Re: Heater shut off valves

Not sure if this will help

The hearter hoses should be rubber with maybe a 1in ID. And low pressure

The ac lines I would think would be high pressure type line (due to lines going to evaporator)

Can you trace it back to the front?

If ithooks into the engine block it would be heater

If it hooks to an accessary attached to the engine driven by a belt....than I would say its ac

Let us know how it turns out
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Old 06-14-2013, 05:10 PM   #3
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Re: Heater shut off valves

Thanks. Btw do both valves on the engine need to be open for the radiator fluid to flow to the back. I'm trying to trace them but I can't seem to tell
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Old 06-14-2013, 05:56 PM   #4
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Re: Heater shut off valves

Im trying to post pics but I keep getting an error message :Sorry, the board attachment quota has been reached. Any way to post pics? Thanks
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Old 06-14-2013, 07:42 PM   #5
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Re: Heater shut off valves

Yes both valves need to be open to complete the loop....photobucket is your friend
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Old 06-14-2013, 07:44 PM   #6
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Re: Heater shut off valves

Go to Photobucket. Establish a folder and name it.

Upload photos from your computer to the folder that you made.

Once they have been uploaded, click on the star on the upper right of the thumbnail. A screen will appear on the right. Click where it says forum. It will say "copied"

Then paste it on your forum posting. You will see the image code.

Then when you post onto the forum, you will see the photo.
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Old 06-14-2013, 08:40 PM   #7
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Re: Heater shut off valves





Are the shorter hoses the ac hoses?
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Old 06-14-2013, 09:33 PM   #8
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Re: Heater shut off valves

Thanks for the help and the directions on how to post pics! You guys are great.
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Old 06-15-2013, 08:03 AM   #9
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Re: Heater shut off valves

The air conditioning lines are the ones that have the steel braid inside. Heater just use cloth braid.
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Old 06-15-2013, 01:45 PM   #10
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Re: Heater shut off valves

Ok I'm into the project! I open the valves and I get a small amount of fluid to the intake of the pump when the engine is reving. When i shut down the engine i get a large bolus of fluid to the intake. Is there a thermocouple or sonething i am missing to get flow to the pump? Once I figure out how to get flow to the pump I will check the pump itself
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