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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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Old 06-15-2013, 02:46 PM   #11
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Re: Heater shut off valves

I'm not really familiar with that system. If in fact those hoses are heat/AC an automotive cooling system would have a hard time getting coolant that high. There would have to be some sort of pump capable of creating lift. The engine water pump and most heater circulation pumps don't do that, all they do is circulate.They need to have the inlet flooded(they don't suck) If there isn't an electric pump somewhere between the engine and where those hoses are, the unit must have had a pump. And I would doubt that, it's easier to push water than to pull it

Typically the hose that comes off of the engine water pump is the discharge (going to the heater) If you only want heat, it would be better to mount a heater on the floor, making sure that it is below the level of the radiator tank. Since heat rises, and you mount the heater low it's more likely to heat the space better. Sure you can blow it down, but the more blow it around the faster it cools off.
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Old 06-15-2013, 05:09 PM   #12
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Re: Heater shut off valves

There is a pump halfway between the engine and the back. Not a huge amount of fluid gets to the pump tho?
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Old 06-15-2013, 10:23 PM   #13
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Re: Heater shut off valves

Without a doubt the two cut hoses seen in your pic are A/C based on the thickness of the hose wall. Try blowing compressed air through the cut hoses and see if you get refrigeration oil or antifreeze shot back at you. BTW, antifreeze tastes sweet. Good luck!
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Old 06-16-2013, 07:23 AM   #14
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Re: Heater shut off valves

Quote:
BTW, antifreeze tastes sweet
I know why I know this, just wondering how you do.

FYI. If it's part of a vehicle,liquid or metal. I have had it in my mouth, eyes, nose and ears at some point in time
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Old 06-16-2013, 01:59 PM   #15
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Re: Heater shut off valves

Just been at it a loooooong time.
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Old 06-16-2013, 03:01 PM   #16
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Re: Heater shut off valves

Quote:
Originally Posted by somewhereinusa
Quote:
BTW, antifreeze tastes sweet

FYI. If it's part of a vehicle,liquid or metal. I have had it in my mouth, eyes, nose and ears at some point in time
YEP! My wife thinks I'm "special". Sidenote...an earful of gear lube feels GROSS!!
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Old 06-16-2013, 06:13 PM   #17
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Re: Heater shut off valves

Quote:
Originally Posted by JakeC
Quote:
Originally Posted by somewhereinusa
Quote:
BTW, antifreeze tastes sweet

FYI. If it's part of a vehicle,liquid or metal. I have had it in my mouth, eyes, nose and ears at some point in time
YEP! My wife thinks I'm "special". Sidenote...an earful of gear lube feels GROSS!!
Only when you push it in deeper trying to wipe it out with greasy fingers
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Old 06-16-2013, 10:47 PM   #18
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Re: Heater shut off valves

Hey Somewhere, I once had a Studebaker Avanti with its backwards opening hood. I had taken the car to a repair shop for a generator problem which took some time to solve (while the car was running). I noticed that the upper radiator hose had begun to swell and turned to let the mechanic know that the engine was overheating. Just as I opened my mouth to speak, the entire upper radiator hose fitting blew out of the radiator dumping the scalding antifreeze in my face (and into my mouth). I recieved 3rd degree burns to the face and everywhere my clothes touched my skin--around my sun glasses, t shirt collar, shoulder seams,arm pits, tighty whities elastic and the top of my socks Left a mark or two--oh well, Ya pays Ya money an' ya takes ya chances! I hope your method of discovering this little known fact was less tramatic than mine.
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Old 06-17-2013, 11:58 AM   #19
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Re: Heater shut off valves

Quote:
Originally Posted by ol trunt
Hey Somewhere, I once had a Studebaker Avanti with its backwards opening hood. I had taken the car to a repair shop for a generator problem which took some time to solve (while the car was running). I noticed that the upper radiator hose had begun to swell and turned to let the mechanic know that the engine was overheating. Just as I opened my mouth to speak, the entire upper radiator hose fitting blew out of the radiator dumping the scalding antifreeze in my face (and into my mouth). I recieved 3rd degree burns to the face and everywhere my clothes touched my skin--around my sun glasses, t shirt collar, shoulder seams,arm pits, tighty whities elastic and the top of my socks Left a mark or two--oh well, Ya pays Ya money an' ya takes ya chances! I hope your method of discovering this little known fact was less tramatic than mine.

OUCH!!!!!
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