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Discussion Starter #1
Can anyone tell me what the warning sticker message means on the 2002 Ody? The sticker is found on the front left after you raise the hood. It says something like "This vehicle is equipped with a rear heater, please remember this when changing the coolant". I found nothing about it in the owners manual.

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1996 Odyssey 120,000 miles
2002EX Odyssey w/towing package
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<font face="Verdana, Arial" size="2">Originally posted by sweaver:
Can anyone tell me what the warning sticker message means on the 2002 Ody? The sticker is found on the front left after you raise the hood. It says something like "This vehicle is equipped with a rear heater, please remember this when changing the coolant". I found nothing about it in the owners manual.

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I could be wrong, but I think it just means that when you do a complete coolant change, you need to turn on both the front and rear heaters during the flushing procedure. That way the flushing fluid (water or system cleaner) is diverted back through the front AND rear heater cores, allowing all of the old coolant to be removed. Conversely, when filling the system with new coolant, the rear heater core must be on or you won't fill it. Then the next time you turned on your rear heater, to cooling system level would drop dramatically.

Like I said, I could be wrong, but this makes sense to me based on my experience with flushing cooling systems.

STLODY
 

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Stlody is correct. There is a whole HVAC setup with heater core, A/C evaperator, blower, etc in the right rear quarter. Thats why there is no storage in that area. When flushing the system you need to turn the heaters on to flush the heater cores. Also this label warns the technichian that he's gonna need boatloads of coolant to fill the system back up. Personally I think the rear HVAC is overkill. It adds about 70 pounds of weight to the vehicle including all the plumbing and fluid. And it takes up a space that I'd much rather have for gear. I mean the front heater works really fast and could easilly have a simple duct to the rear. Plus all those extra parts increases the odds of something failing 5-10 years down the road.

Dont get me wrong, the rear system works extremely well. I just don't need it.

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Maybe you don't need the rear AC in St. Louis, but here in South Florida, its a godsend.

Its impossible to cool a large vehicle down during the summer here. Especially, if it has been sitting in the sun for any length of time.

I think Honda did the right thing.

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Craig
 

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With a family of 5, one kid needs to sit in back. In that situation the rear air/heat is a must. My preioud van didn't have it and it was always cold or hot back there. I'm not sure the long ducts would work. Where would you route them that summer heat or winter cold wouldn't nullify their effects for the longest runs? I guess if you weren't concered about the back row they might be fine.

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D Schaefer
99 Odyssey EX (9" TV/VCR w/Steel Horse Tote, soon to be SmartScreen rear delay wiper)
93 Escort LX (basic, no frils, get-to-work-and-back car)
60 Thunderbird Conv. (THIS is the real fun!)
 

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Discussion Starter #6
Thanks for the explaination. Unless i am mistaken my 1995 Ody does not have a seperate system for the back. The overhead unit gets its "power" from the main AC/Heat. It has done a great job of keeping the back cool/warm. I might be inclined to agree about there being overkill built in.

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1996 Odyssey 120,000 miles
2002EX Odyssey w/towing package
http://www.homestead.com/weaverhouse/index.html
 

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Overkill? Probably not. Honda wouldn't have added it if they didn't think it was necessary. I believe that they would have made more money by using long ducts,etc. It would certainly have been a lot cheaper than putting an entire heating/cooling system in the rear of the vehicle. I didn't even realize it was there and probably wouldn't have paid for it if it was an option. I call it good engineering. That's why we buy Hondas, isn't it?

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Not overkill at all. Even on Brand “X” vans, the rear heater issue exists. Here is the problem.
Let's say we completely drain the cooling system due to a repair to the cooling system. OK, and let’s say that it drained for hours or possibly over night. Both conditions are possible. Now we complete the repair and fill the system the same way we would a normal vehicle without a rear heater. On a car without a rear heater, there is enough fluid in the coolant recovery tank to replace the trapped air in the block and front heater core without draining it dry.
The air trapped in the rear heater core and hoses plus the residual air trapped in the front heater core and engine block far exceeds the capacity of the coolant recovery tank. When the air finally purges out of both heater cores and engine block, the coolant recovery tank has been drained and now air is circulating in the cooling system and creating steam. This causes major problems.
The "strange warning" is to make the mechanic aware that there are 2 heater systems in the vehicle and that care must be taken to ensure that both systems are purged of as much air as possible prior to topping off the coolant recovery tank and returning the vehicle to the owner.
Been there! Done that!

Fred
 

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Discussion Starter #9
I agree that they know what they are doing, that is why I buy Hondas. Having said that, I was just stating that the 1999 Ody that i drive everyday heats and cools just fine with the little overhead unit that is tied to the "regular" system.

The 2002 Ody is quite a lot larger, but then again the windows are tinted pretty heavily as well. (Cooling being tha most important factor in "Hot-lanta")

Thanks for the replies, I knew you guys would come through for me!

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1996 Odyssey 120,000 miles
2002EX Odyssey w/towing package
http://www.homestead.com/weaverhouse/index.html
 

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According to the 2001 Helm manual, the coolant change on the Odyssey is as simple as any other. The radiator cap is removed and the radiator drain is opened. Next, the engine block drain is opened and drained until it stops. Both drain plugs are then tightened and the coolant recovery bottle and radiator are filled. The radiator cap is left loose(open to the first notch) and the engine is run until the fan has cycled twice and the coolant is topped off. The job is then said to be done. There is no "purging" of the system, except for running it with the radiator open to the atmosphere.

I had a Toyota MR2 which had an elaborate cooling system, since the engine was in the rear and the radiator in the front. That little sportster had three different valves which had to be opened during a coolant fill, to ensure that all air was out of the system. One installed clear hoses, which were held elevated and watched for coolant to rise into each of them, before the system could be considered ready to run. It was a good, confidence inspiring way of doing the job. With the long lines in the Odyssey, I would really be holding my breath that there wouldn't be some large amount of air trapped somewhere in those long lines to the rear.

Those who wrote the book do not seem worried, so why should we be concerned? ?

Jerry O.

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2001 Odyssey GG LX
 

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One more small point about the rear heater/AC. The main reason the system was put in the rear,too, was to keep a livable climate for the extra hamsters who live in that grille on the right hand wall, at the rear of the van. Think how you would feel if your van quit on a dark night in Frozen Ass, Idaho and you found all your reserve hamsters were frozen.......You'd wish you'd bought the van with On-Star, Hee! Hee!

Jerry O.

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2001 Odyssey GG LX
 
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