Anyone have the thread on DIY coolant flush in 300D

[Austin85]

I did a search and found pieces but remember reading step by steps on Coolant flush in a 300D...I got a couple of gallons of G-5 today at Napa store today and really need to get at it soon.

WHunter ? BC ? BHD ?

[Brian Carlton]

Here's a few that I found.


Cooling system flush


citric acid and the heater core.


Flushing Radiator


Want to flush coolant on SDL

If you have any other questions, just post 'em.

[Austin85]

1) Can I do a flush without having to do a citric acid flush? Tha sounds like an all day affair and my temp gauge for coolant has been at good low temps ,
although IDK when the last time the coolant was changed or flushed by any PO's.
I've had her for 1 yr now this month.

[Brian Carlton]

Originally Posted by Austin85

1) Can I do a flush without having to do a citric acid flush? Tha sounds like an all day affair and my temp gauge for coolant has been at good low temps ,
although IDK when the last time the coolant was changed or flushed by any PO's.
I've had her for 1 yr now this month.

Of course. Just drain the radiator, remove the block drain, and, if you can get a Prestone T, you can install it in the line from the head and flush the heater core with a garden hose. Or, you can just shove the garden hose into the end of the hose and flush the heater core. Makes a big mess, but it works.

Then, when all the water is clean.........just let it all drain out and close it all up.

Refill with a 50/50 mix of Zerex G-05 and distilled water. Don't forget to take off the upper hose and fill it as much as you possibly can.

[Austin85]

Originally Posted by Brian Carlton

Of course. Just drain the radiator, remove the block drain, and, if you can get a Prestone T, you can install it in the line from the head and flush the heater core with a garden hose. Or, you can just shove the garden hose into the end of the hose and flush the heater core. Makes a big mess, but it works.

Then, when all the water is clean.........just let it all drain out and close it all up.

Refill with a 50/50 mix of Zerex G-05 and distilled water. Don't forget to take off the upper hose and fill it as much as you possibly can.

Sounds cool. You say " shove the garden hose into the the end of the hose and flush..." Into which hose? The upper hose from the radiator???

If I flush the heater core do I need to plug the radiator back up so there are not 2 openings?????

[Brian Carlton]

Originally Posted by Austin85

Sounds cool. You say " shove the garden hose into the the end of the hose and flush..." Into which hose? The upper hose from the radiator???

If I flush the heater core do I need to plug the radiator back up so there are not 2 openings?????

There is a hose that is attached to the rear of the head on the driver's side. Remove this hose from the head and shove the garden hose into this hose.

You can leave the radiator drain open. In fact, you will probably get better results if you pull the lower hose, otherwise the radiator is going to fill up and overflow because the garden hose will flow much more water than the radiator drain can handle.

[boneheaddoctor]

Brian summed it up pretty well....a proper citric acid flush is very time consuming and may take 2 days to complete all the steps...down in Sunny Florida you don't have the freezing temps we have to think about ....if it needs a citric acid flush its going to show up as high temps up long mountains that you don't find in your area, or on the hottest days of summer.

[sokoloff]

If the coolant is clean and you haven't been having any temp problems, then you can likely get away with just a flush and fill as indicated above. But should you decide to do a citric acid flush, check the manual because I'm pretty sure it is quite clear that a deoiling must be done before doing a citric acid flush whether there is evidence of oil in the coolant or not.

Len

[Austin85]

Thanks, much all.
I got the prestone T flush kit today at AdvanceAP and it's on the list.

[Brian Carlton]

Originally Posted by Austin85

Thanks, much all.
I got the prestone T flush kit today at AdvanceAP and it's on the list.

Remember, the instructions say to simply leave the T in place, forever.

You don't want to follow these instructions.

Remove it and put it away for another couple of years.

[Austin85]

Originally Posted by Brian Carlton

Remember, the instructions say to simply leave the T in place, forever.

You don't want to follow these instructions.

Remove it and put it away for another couple of years.

Yeah BC
I just read the instructions and it says to cut my inline hose and install the T in the hose away from the engine heat like midway.....
Do I have to cut my hose? I wouldn't want to cut my hose unless I was gonna replace it after the flush.
any alternatives withthis????
aa

[Palangi]

Splice in an extra hunk of hose temporarily.

[Austin85]

Originally Posted by Palangi

Splice in an extra hunk of hose temporarily.

That could work.
What size hose is this going into?? The inlet hose.

aa

[Palangi]

I would just be making a guess without measuring it, but, as best I remember, 5/8 is close enough to work for this purpose.

[bgkast]

I would like to do a quick coolant flush while I am replacing the water pump on my 240. The block drain is the 19mm hex hed on the right side of the engine just above and forward of the starter right? How much and what kind of coolant should I fill it back up with? Thanks. -Bryan