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Discussion starter · #21 ·
dpkelly knows well

There are two important points here.

1. I have drained other cars with a 6.5litres cooling system capacity...removed thermostat...flushed the system with the garden hose...then refilled with 50/50 premix. Great? No. I was only able to get 3.5 litres of the new coolant/water back into the cooling system.

This means there was 6.5-3.5=3litres of pure water already in the block etc. I added 50/50 3.5 litres (ie 1.75 coolant + 1.75 litres water). So my whole cooling system had 1.75 litres coolant and (6.5-1.75) 4.75litres water. This is a 27% mixture.


2. How would you be able to flush the cooling system if the thermostat was still in the car as it would be closed and block the flow of water?
 
Kuroyuki, answer to your point (and dpkelly's):

1. Prestone recommends to add minimun 3 litres of pure antifreeze to get 50/50 mix after flushing. The reason is that if you have already 3 litre of water in the system after flushing, that's eventually becomes 50/50 mix.

2. Most of the flush kit would require to run the engine about 10 minutes to allows the thermostate to open before flushing.
 
Discussion starter · #23 ·
Okay but another 2 points:

1.Wouldnt running cold water through a hot engine be dangerous...ie potential to crack head/block.
2. If you heated up the engine before you flushed...wouldnt the thermostat just close as soon as the cold water starts to pass through it.
 
If there is already approximately half water in the system why can't a non-diluted coolant be used. This would then mix with the water in the block and give you about a 50/50 mix. Yes?
 
As long as you start out with the engine cooled down I've never experienced or even head of anyone else doing the same procedure having problems.

Only issue I can think of running a constant supply of cool water might take an extra minute or two for the thermostat to open up, which really isn't a big deal in the grand scheme of things.

You can always compensate for the 50/50 mix as long as you are aware of the capacities.

Just get a jug of full grade antifreeze and compensate with distilled water from the grocery store, and more as required.
 
Simply says Prestone uses a flush and fill system through an adapter. It basically flush with fresh water through a funnel while the engine is running hot, as the dirty coolant emptied into a container, you immediately fill with fresh coolant through the same funnel. As the fluid is circulating continuosly, it just works like what a normal cooling system suppose to do. This is a power flush and I am sure it works better than a static drain through the drain plug.
Your concern on crack block due to thermal shock does not apply to flushing, we are not talking about quenching a hot engine into a cold bath here. I am sure millions use their kits, if there are problems, no one would buy their product.
 
Ossy said:
Simply says Prestone uses a flush and fill system through an adapter. It basically flush with fresh water through a funnel while the engine is running hot, as the dirty coolant emptied into a container, you immediately fill with fresh coolant through the same funnel. As the fluid is circulating continuosly, it just works like what a normal cooling system suppose to do. This is a power flush and I am sure it works better than a static drain through the drain plug.
Your concern on crack block due to thermal shock does not apply to flushing, we are not talking about quenching a hot engine into a cold bath here. I am sure millions use their kits, if there are problems, no one would buy their product.
Sounds like a circus trick. Hope you're not overburned any gaskets of your engine. Hmm... but that hocus pocus might works on an oldest odys. :p
How you collect old dirty stuff? AFAIK you cannot just drain dirty coolant anywhere 'cause tt's illegal by any state's law and "community watch" always, everywhere and tireless...:rockon: ;) :D
 
Let’s go back to the post subject - I'd like to be pointed to where the coolant drain plugs on the engine block and on the radiator are. I checked out my ’01 Ody. but did not see the radiator drain plug. It was easy to find on my Toyota Previa. Is the radiator drain plug hidden under the plastic protection? or reachable through the hole in the plastic? (right bottom side under radiator) :confused:
I searched under the bottom for engine drain plug. Is the circled one on attached pic the right one? (left side of engine) :confused:
 

Attachments

This one looks like the ATF drain.

The engine block coolant drain is more on the passenger side, facing the firewall. It is easier seen when the front right wheel is removed.
 
Discussion starter · #30 ·
That there photo looks exactly like ATF drain plug...but "on the left"?? Mine is on the right. Left hand drive..left drain plug? Right hand drive..right drain plug?

I still havent changed coolant yet despite starting this thread a long time ago. Could someone who knows where the block drain plug is PLEEEASE take a photo and give a detailed description of location....this will help alot of people.
 
Not sure why this is an issue. I have never drained my coolant from the block.....always from the drain cock on the radiator. Why is it so important that you drain the block?
 
Yep. That's the one! A normal bolt has the threads thinner than the bolt head. On this one, the threads are thicker than the bolt head. I believe this is what makes it so hard to get out. I couldn't get my Ody engine block drain plug off. The one on my '92 civic was very difficult to get off. I had to use a breaker bar to continually loosen it.
 
ody8822 said:
not sure this is the drain plug on block, took this pic when change timing belt, water pump & the steel hose.

pic after the steel hose dismentle
From what engine is this picture ? Cant be the 1999-2004 Odyssey.
 
twiggy144 said:
From what engine is this picture ? Cant be the 1999-2004 Odyssey.
I just realized this is a 95-98 Odyssey forum ! I laugh at myself !!!:stupid:
 
Oasisnjrz said:
Not sure why this is an issue. I have never drained my coolant from the block.....always from the drain cock on the radiator. Why is it so important that you drain the block?
There is some explanation and I'd like to have that vacuum tool... :) , but was surprised when asked my neighbor, who is a mechanic on BMW dealer shop, how he drain/flush/etc coolant and he said I just drain and refill, no any time-consuming procedures... :eek:
 
I've never drained the coolant from any place but the radiator drain on any of my vehicles. I am going on 12 years and close to 180K miles on the Oasis with northeast winters and Jersey shore summers...with the original radiator! Last time I flushed it was last fall when I changed the thermostat, and it looked pristine. The radiator drain is low enough that most of the fluid will drain out of the block, as long as you open the bleed valve above the thermostat. Draining the block seems like a lot of extra effort, with not much benefit, IMHO.
 
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