Thread: Flush Radiator
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  #14  
Old November 15th 05, 06:26 AM
KWS
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Default Flush Radiator

The idea is to allow the thermostat to open so coolant flows from that area
as well. This is done with the cap off. I would not suggest you put your
face over the opening, but I have never seen coolant "geyser" out.

When the cap is on, pressure builds up as the coolant gets hot. That's why
they don't want you opening the thing. Coolant will gush out, you might get
burnt and you will get coolant all over the radiator (and into the fan if
the car is running, which sprays it all around...ugh).

But that's not what you are doing. Since the cap is off, no pressure real
builds up. Once the thermostat opens, the coolant will swirl around. If it
starts overflowing the filler, then some will drain into the overflow jug
and it probably means you have enough in the system.

This is not to be confused with the excitement caused by removing the
radiator cap on a car that is overheating. In that case, there is a lot of
pressure and the aforementioned geyser is pretty much inevitable. That's
not what is happening here.

Best,

Ken


"Brian" > wrote in message
news:A89ef.17138$Mr4.3707@trnddc08...
> So in step 8 when do you put the cap on? Once the thermostat reaches
> operating temperature, or before? I'm being careful about this as I don't
> want to go blind from getting sprayed by coolant in the eyes.
>
> > Steps six, seven and eight are sequential. Warm it up without the cap.
> > Refill to the filler neck after the level drops a bit and put the cap

on.
> >
> > It is actually pretty easy, Brian. Hell, If I can do it...anyone can.
> >
> > Good luck.
> >
> > Ken
> >
> >
> > "Brian" > wrote in message
> > news:3jBdf.2964$Mr4.2515@trnddc08...
> > > for step 3 - so force the water out the engine block drain first, then

> > close
> > > that and force it out through the radiator drain?
> > >
> > > for step 8 it says, and another guy in a later post said you leave the

> cap
> > > *off* while warming up the engine. In his post he even said to add

more
> > > coolant to radiator while car idles. Your post implies as it heats up

> the
> > > cap is *on*. Which is it?
> > >
> > > You guys also mentioned to change the coolant in the overflow

container.
> > Do
> > > you have to remove it to do that? It's kinda bolted in there I think.
> > >
> > > I understand the rest. Thanks for the help.
> > >
> > > Brian
> > >
> > > > For step 3 I'd close the radiator drain and force water in thru the
> > > radiator
> > > > cap opening. Then I'd also open the radiator drain back up and make

> sure
> > > to
> > > > run plenty of water thru the radiator. Remember old coolant of most

> > types
> > > is
> > > > a hazardous material, don't just run it down the storm sewer. Bottle

> it
> > > and
> > > > dispose of it properly.
> > > >
> > > >
> > > > In step 8 you've got to run it till it get's up to full operating
> > > > temperature. At that point your thermostat opens and let's the

coolant
> > > > circulate, doing it's job. If you note the temperature of the upper
> > > radiator
> > > > hose and keep track of it (by touch) as the car warms up, you'll

> notice
> > > when
> > > > it starts to get seriously hot. That'll show you it's open and

> flowing.
> > > Keep
> > > > in mind when they say check system this DOES NOT mean open the

> radiator
> > > cap
> > > > and check the level. It means to look around / under to make sure

you
> > > don't
> > > > have any leaks (like forgetting to properly tighten a drain).
> > > >
> > > > Two other things you can do that will help. One is to squeeze the

> upper
> > > > radiator hose real good a few times as you're getting the system

close
> > to
> > > > full of coolant, this can help push out and trapped air bubbles.

> > Secondly
> > > > they don't say to add coolant to your overflow bottle, you do want

to
> do
> > > > that. Once you're done you'll want to check your overflow bottle

> (after
> > > the
> > > > car is mostly / all cool) and add back up to the correct line. You

> might
> > > > have to repeat this process a couple times over the next few days to

> > make
> > > > sure you're properly full-up.
> > > >
> > > > Keep in mind that coolant splashes pretty bad, watch your eyes.
> > > >
> > > > If you're as green as I'd like to be, I think you can now buy
> > > biodegradable
> > > > coolant, but I'm not for sure.
> > > >
> > > > Good luck.
> > > >
> > > > Chris
> > > > 99BBB
> > > > 92BB&T for sale
> > > >
> > > > "Brian" > wrote in message
> > > > news:84vdf.4082$rO4.945@trnddc05...
> > > > >I have a 1996 Miata 1.8 L. I have never flushed and refilled

coolant
> > > > > (myself), so i'm looking for some guidance. I have Haynes manual

> for
> > my
> > > > > Miata.
> > > > > Instructions a
> > > > > 1. drain coolant thru radiator drain
> > > > > 2. loosen engine block drain plug and drain coolant thru there
> > > > > 3. flush system
> > > > > 4. drain overflow reservoir
> > > > > 5. close rad. drain and engine block drain
> > > > > 6. Place heater temp control in max heat position
> > > > > 7. slowly add coolant till radiator is full
> > > > > 8. run car with radiator cap off until thermostat opens
> > > > > 9. turn car off and let cool
> > > > > 10. add more coolant to radiator to fill to top
> > > > > 11. replace radiator cap and start engine
> > > > > 12. allow to reach operating temp & check system
> > > > >
> > > > > My questions:
> > > > > 1. in step 3 do you flush thru radiator drain or engine block

drain,
> > or
> > > > > both?
> > > > > 2. in step 6 what is the heater temp control? How do I place it

in
> > max
> > > > > heat
> > > > > position?
> > > > > 3. what do they mean by step 8 - run until thermostat opens?
> > > > > 4. are there any other important steps I am missing?
> > > > >
> > > > > thanks for any help
> > > > > Brian White
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >

> >
> >

>
>



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