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.
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:

 

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)
I searched under the bottom for engine drain plug. Is the circled one on attached pic the right one? (left side of engine)

 

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.

 

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?

 

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

 

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.

 

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.

 

How do you get to the drain plug? ...from underneath, side or top?

 

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:

 

I just realized this is a 95-98 Odyssey forum ! I laugh at myself !!!:stupid:

Yep!!! you're right! I used "search" to find the subject...:um: Anyway, still cannot find drain plugs location on '01 Ody
Pls, give me direction...:worship:

 

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...

 

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.

 

How do you get to the drain plug? ...from underneath, side or top?

from underneath, same as u change your oil filter

edit: my ody: 98 RA4 with f23a vtec

 

fyi: right engine block coolant drain bolt; wrong engine...that's an I4 one. ody has a V6. don't know myself...sorry.