Doing a coolant backflush tommorow...wondering which hoses to work with (w/ pictures) - The Acura Legend & Acura RL Forum
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Second Generation Legend (1991-1995)

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Old 03-01-11, 11:40 PM   #1 (permalink)
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Talking (Pictures here now) Doing a coolant backflush Fri...which hoses to work with?

I'm planning to flush the coolant on Friday and would like to backflush the cooling system with a kit I got the other day. It looks fairly easy, but the instructions to the kit (2nd picture) say to connect to the heater inlet hose, and I don't know which one that is. I have pictures of the hoses, marked with letters.

As far as coolant draining, the shop manual says just remove the radiator drain plug, but I remember reading in posts here that there is a hose to disconnect near the oil pan that will remove more of the coolant. There even used to be a picture of which one it was, but it was an old post and it's gone now.

Anyone?

Heater hose inlet -- Hose "A" or "B"?


Prestone backflush kit instructions



Also...is "F" a hose I can disconnect to drain the system better at the end of the flush? I have read on this board that there is a hose near the oil pan that can drain the cooling system more thoroughly, and I hope it's the last marked hose in this pic...I know it's not "C," that's the lower radiator hose, and I'm pretty sure it's not "D" or "E" either. (If I remember right, D & E connect to what I think is the variable speed sensor)

Maybe "F" is an oil line? Not sure what it is, but these are the only hoses that were near the oil pan that I could see

Last edited by 'Ludes to Legends; 03-03-11 at 06:38 PM. Reason: Got the pictures to load by making 15 posts, and added a little more coherance
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Old 03-03-11, 05:21 PM   #2 (permalink)
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[EDIT: Ok, the pictures show up correctly in the first post now]
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Old 03-03-11, 05:58 PM   #3 (permalink)
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The inlet heater hose is the one that has the valve in it, it controls whether or how much coolant goes into the heater core. Be careful though, the valve is plastic and breaks easily on a 15+ year old vehicle and the "soft" brass heater core connectors bend REALLY easily.

'F' is a coolant hose that goes to the differential and is probably the lowest one on the vehicle.
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Old 03-03-11, 06:28 PM   #4 (permalink)
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I used that kit on a Grand Marquis once...really made flushing easy....of course the heater hose went along the passenger's side, over the engine, and to the water pump bypass...very easy to get to, cut, and play with...

However the Legend's looks a bit more difficult!

You could also (if you don't mind getting water all over the place) disconnect all of the radiator hoses and do a back and forward flush on a cold engine after removing the thermostat by simply sticking a garden hose in each way and going to town with the spray (be sure to have the heater valve 100% open!).

You can then repeat the procedure for the radiator...
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Old 03-04-11, 06:14 AM   #5 (permalink)
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Make your self room to get to those hoses and you should be okay.
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Old 03-29-11, 04:16 PM   #6 (permalink)
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Did it work?
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Old 03-29-11, 06:55 PM   #7 (permalink)
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Mine is due. Great pics. I hope it worked for him!
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Old 03-30-11, 06:14 PM   #8 (permalink)
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Question: What is suppose to happen when you press and hold "auto" and "off" on the climate control. I did this and nothing extra came up on the screen.
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Old 01-07-12, 07:27 PM   #9 (permalink)
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Okay which hose is the correct hose to tab in to? "A" or "B?"
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