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  #1 (permalink)  
Old 03 Mar 2004, 03:12 pm
Samuel
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Default Radiator coolant and thermostat

How often I need to replace the thermostat?
Also, Haynes says to drain the coolant, unscrew the bolt under the radiator
and then disconnect the lower radiator hose. Is that correct? just by
disconnecting the lower hose will drain all the coolant including the block?
I do not want to mess with the bolt on the block, I heard is a PITA.
Thanks


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  #2 (permalink)  
Old 03 Mar 2004, 03:42 pm
Peter Doherty
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Default Re: Radiator coolant and thermostat

It would help if we knew what kind of car you have (and please, be VERY
specific...this is an international newgroup)



"Samuel" <shill025@home.com> wrote in message
news:M_q1c.33447$qo.13050@fe1.texas.rr.com...
> How often I need to replace the thermostat?
> Also, Haynes says to drain the coolant, unscrew the bolt under the

radiator
> and then disconnect the lower radiator hose. Is that correct? just by
> disconnecting the lower hose will drain all the coolant including the

block?
> I do not want to mess with the bolt on the block, I heard is a PITA.
> Thanks
>
>



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  #3 (permalink)  
Old 03 Mar 2004, 05:17 pm
Samuel
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Default Re: Radiator coolant and thermostat

Yes, I am sorry, I forgot. It is a 98 civic auto, 110k miles on it. The
thermostat, water pump and coolant was replaced at 80K miles or so with the
timing belt.
One time I tried to drain the coolant by just unscrewing the plug under the
radiator but not much coolant came out, this time I'd like to do it right.
If I run the hose thru the upper radiator hose, will I be able to drain all
that water? The new antifreeze from honda is already diluted.
Thanks

"electricked" <no_emails_please> wrote in message
news:yoydnRFI7rc-3tvdRVn-iQ@comcast.com...
> You don't need to remove the bottom radiator hose. Just remove the bottom
> screw on the radiator and everything will pour out. The block won't be
> flushed this way. You have to use a hose with water to flush all the

coolant
> out. Simply plug the hose in the radiator (by radiator cap) and if you
> haven't disconnected the bottom radiator hose the coolant will be flushed
> through the top radiator hose. So make sure you have some place to store

all
> that coolant+water.
>
> I changed the thermostat for the first time at 100K on my 98 accord. It's
> not expensive so if you can DIY then I'd replace it at 60K then 100K then
> 150/200K etc. I haven't looked at the manual but it's not that often. I
> think it says it needs to be changed at 100K or so. Maybe someone confirm
> this or I'll look tonight in my owner's manual.
>
> Btw, what kind of car do you have?
>
> --Viktor
>
> "Samuel" <shill025@home.com> wrote in message
> news:M_q1c.33447$qo.13050@fe1.texas.rr.com...
> > How often I need to replace the thermostat?
> > Also, Haynes says to drain the coolant, unscrew the bolt under the

> radiator
> > and then disconnect the lower radiator hose. Is that correct? just by
> > disconnecting the lower hose will drain all the coolant including the

> block?
> > I do not want to mess with the bolt on the block, I heard is a PITA.
> > Thanks
> >
> >

>
>



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  #4 (permalink)  
Old 03 Mar 2004, 05:44 pm
electricked
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Default Re: Radiator coolant and thermostat

You don't need to remove the bottom radiator hose. Just remove the bottom
screw on the radiator and everything will pour out. The block won't be
flushed this way. You have to use a hose with water to flush all the coolant
out. Simply plug the hose in the radiator (by radiator cap) and if you
haven't disconnected the bottom radiator hose the coolant will be flushed
through the top radiator hose. So make sure you have some place to store all
that coolant+water.

I changed the thermostat for the first time at 100K on my 98 accord. It's
not expensive so if you can DIY then I'd replace it at 60K then 100K then
150/200K etc. I haven't looked at the manual but it's not that often. I
think it says it needs to be changed at 100K or so. Maybe someone confirm
this or I'll look tonight in my owner's manual.

Btw, what kind of car do you have?

--Viktor

"Samuel" <shill025@home.com> wrote in message
news:M_q1c.33447$qo.13050@fe1.texas.rr.com...
> How often I need to replace the thermostat?
> Also, Haynes says to drain the coolant, unscrew the bolt under the

radiator
> and then disconnect the lower radiator hose. Is that correct? just by
> disconnecting the lower hose will drain all the coolant including the

block?
> I do not want to mess with the bolt on the block, I heard is a PITA.
> Thanks
>
>



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  #5 (permalink)  
Old 03 Mar 2004, 07:39 pm
electricked
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Posts: n/a
Default Re: Radiator coolant and thermostat

Sam,

You have to open the coolant reservour (plastic bottle) and remove the
radiator cap in order for air to get in so the coolant can go out. The
principle is simple. Imagine you have a glass of water and a straw. You pull
some water in the straw and while you are holding the top closed (no air can
get in) the water stays even if the bottom of the straw is facing the ground
(analogous to radiator screw on bottom remove and radiator cap still on--no
air can get in and there's vacuum). Same way if you remove your finger or
tongue from the top of the straw air gets in, and the water drops on the
floor (analogous to removing the caps from the radiator and plastic coolant
reservour).

You can flush the block through the upper radiator hose only if the lower
radiator hose is disconnect (that's where the coolant will get out from the
block). Otherwise, if the bottom radiator hose is not remove, the coolant
will stop dripping from the top of the radiator (by radiator cap) and you
don't want that. There are a lot of electric circuits there (headlights,
horn, fans, etc.) and that's just one of the reasons. You'll make a big mess
inside the engine compartment if you let the coolant drop from top of
radiator hose.

Best if you remove top radiator hose and flush the system through top
radiator opening with the lower radiator hose intact, so the coolant will
come out the upper radiator hose and you can extend that to the bottom of
the car or to the side.

--Viktor

"Samuel" <shill025@home.com> wrote in message
news:zPs1c.33460$qo.17628@fe1.texas.rr.com...
> Yes, I am sorry, I forgot. It is a 98 civic auto, 110k miles on it. The
> thermostat, water pump and coolant was replaced at 80K miles or so with

the
> timing belt.
> One time I tried to drain the coolant by just unscrewing the plug under

the
> radiator but not much coolant came out, this time I'd like to do it right.
> If I run the hose thru the upper radiator hose, will I be able to drain

all
> that water? The new antifreeze from honda is already diluted.
> Thanks
>
> "electricked" <no_emails_please> wrote in message
> news:yoydnRFI7rc-3tvdRVn-iQ@comcast.com...
> > You don't need to remove the bottom radiator hose. Just remove the

bottom
> > screw on the radiator and everything will pour out. The block won't be
> > flushed this way. You have to use a hose with water to flush all the

> coolant
> > out. Simply plug the hose in the radiator (by radiator cap) and if you
> > haven't disconnected the bottom radiator hose the coolant will be

flushed
> > through the top radiator hose. So make sure you have some place to store

> all
> > that coolant+water.
> >
> > I changed the thermostat for the first time at 100K on my 98 accord.

It's
> > not expensive so if you can DIY then I'd replace it at 60K then 100K

then
> > 150/200K etc. I haven't looked at the manual but it's not that often. I
> > think it says it needs to be changed at 100K or so. Maybe someone

confirm
> > this or I'll look tonight in my owner's manual.
> >
> > Btw, what kind of car do you have?
> >
> > --Viktor
> >
> > "Samuel" <shill025@home.com> wrote in message
> > news:M_q1c.33447$qo.13050@fe1.texas.rr.com...
> > > How often I need to replace the thermostat?
> > > Also, Haynes says to drain the coolant, unscrew the bolt under the

> > radiator
> > > and then disconnect the lower radiator hose. Is that correct? just by
> > > disconnecting the lower hose will drain all the coolant including the

> > block?
> > > I do not want to mess with the bolt on the block, I heard is a PITA.
> > > Thanks
> > >
> > >

> >
> >

>
>



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  #6 (permalink)  
Old 03 Mar 2004, 08:01 pm
Caroline
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Posts: n/a
Default Re: Radiator coolant and thermostat

FWIW, my Chilton's manual covers 1984-1995 Civics and gives the following steps
to replace the thermostat:
1. Disconnect the negative battery cable.
2. Drain the cooling system (see owner's manual). Like you say, skip the engine
block bolt (more below).
3. Disconnect the radiator hose from the thermostat housing outlet.
4. Remove the thermostat housing outlet and remove the thermostat.
5. Installation is the reverse of the above, except use new gasket and O-rings.
Install the thermostat with the pin towards the thermostat housing outlet.
Tighten the housing outlet bolts to 9 ft-lbs. (84-91 models), and tighten
housing bolts for 92-95 models to 7 ft-lbs.
6. Fill and bleed the cooling system (again, see the owner's manual).

A picture that is supposed to indicate how to replace the thermostat of a 95
(and surrounding years?) Civic appears at
http://www.honda.co.uk/owner/CivicManual/pdf/10-7.pdf

I have skipped the bolt in the block for the last few radiator coolant drain and
fills. My recollection is most people here will say they did the same, because
you're right. It's a pain.

I do pretty thoroughly flush the system, though.

How much coolant your radiator system is supposed to hold; how to drain the
coolant; and how often to replace the coolant should be in your owner's manual.
For my 1991 Civic, the coolant is supposed to be replaced every 2 years or 30k
miles.

I've never replaced the thermostat. My Civic has 151k miles on it.

"Samuel" <shill025@home.com> wrote
> How often I need to replace the thermostat?
> Also, Haynes says to drain the coolant, unscrew the bolt under the radiator
> and then disconnect the lower radiator hose. Is that correct? just by
> disconnecting the lower hose will drain all the coolant including the block?
> I do not want to mess with the bolt on the block, I heard is a PITA.
> Thanks



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  #7 (permalink)  
Old 03 Mar 2004, 10:45 pm
Tegger®
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Posts: n/a
Default Re: Radiator coolant and thermostat

"electricked" <no_emails_please> spake unto the masses in
news:8I2dna9LRsY-w9vd4p2dnA@comcast.com:


>
> You can flush the block through the upper radiator hose only if the
> lower radiator hose is disconnect



You cannot flush AND DRAIN the block that way. There is NO need to
disconnect ANY hoses.

To drain the block, which contains about a quart of fluid, you need to
remove the block drain. The block drain is not that big of a deal unless
it's never been touched for ten years. A 3 ft. cheater bar on your 6-point
socket will usually do it.

If you flush the system with water and fail to drain the block, your new
coolant will be very much diluted, leading to potential overheating,
freezing and corrosion.

Also, you must turn the heater full-warm so it will drain as well.

--
TeGGeR®
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  #8 (permalink)  
Old 03 Mar 2004, 10:50 pm
Tegger®
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Posts: n/a
Default Re: Radiator coolant and thermostat

"Caroline" <caroline10027remove@earthlink.net> spake unto the masses in
news:Sdv1c.18025$yZ1.7821@newsread2.news.pas.earth link.net:
>
> I have skipped the bolt in the block for the last few radiator coolant
> drain and fills. My recollection is most people here will say they did
> the same, because you're right. It's a pain.
>
> I do pretty thoroughly flush the system, though.



If you "flushed" the system but did not remove the block drain, your
coolant is understrength.

Have you measured its strength using a coolant tester? You may be surprised
how weak it is. The block holds almost a quart of fluid.

The longer you skip the block drain, the harder it will be to crack it
loose.


> I've never replaced the thermostat. My Civic has 151k miles on it.



Eventually you'll have poor heater output and will fail emissions due to an
old thermostat.


--
TeGGeR®
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  #9 (permalink)  
Old 03 Mar 2004, 11:14 pm
Caroline
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Posts: n/a
Default Re: Radiator coolant and thermostat

"Tegger®" <teggeratistopdotcom@changetheobvious.invalid> wrote
> "Caroline" <caroline10027remove@earthlink.net> spake unto the masses in
> > I have skipped the bolt in the block for the last few radiator coolant
> > drain and fills. My recollection is most people here will say they did
> > the same, because you're right. It's a pain.
> >
> > I do pretty thoroughly flush the system, though.

>
> If you "flushed" the system but did not remove the block drain, your
> coolant is understrength.


I estimated how much the block held and diluted accordingly. I forgot what I
did, only that it involved several calculations. If anyone wants to know, I'll
dig out my notes and repeat them here.

But you're right to mention it.

snip
> Eventually you'll have poor heater output and will fail emissions due to an
> old thermostat.


Thanks for the tip. I'll start investigating replacement of the thermostat.

But how do you get to poor emissions from a failing thermostat? Improper
cylinder temperature or something?


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  #10 (permalink)  
Old 04 Mar 2004, 12:09 am
JDS
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Posts: n/a
Default Re: Radiator coolant and thermostat

How do you keep from making a mess when you drain the coolant from the drain
block? I also agree is a pain.
How about draining and refilling the radiator with water several times until
the water you get is coolant free (of course, run the engine for a few
minutes to get the coolant inside the heater moving before draining it
again). Once the water is clean, drain it again and fill up 50% of the total
capacity with concentrated antifreeze, then fill up the rest with water to
get the right mixture.


"Tegger®" <teggeratistopdotcom@changetheobvious.invalid> wrote in message
news:Xns94A1E7A70EF35teggeratistop@207.14.113.17.. .
> "electricked" <no_emails_please> spake unto the masses in
> news:8I2dna9LRsY-w9vd4p2dnA@comcast.com:
>
>
> >
> > You can flush the block through the upper radiator hose only if the
> > lower radiator hose is disconnect

>
>
> You cannot flush AND DRAIN the block that way. There is NO need to
> disconnect ANY hoses.
>
> To drain the block, which contains about a quart of fluid, you need to
> remove the block drain. The block drain is not that big of a deal unless
> it's never been touched for ten years. A 3 ft. cheater bar on your 6-point
> socket will usually do it.
>
> If you flush the system with water and fail to drain the block, your new
> coolant will be very much diluted, leading to potential overheating,
> freezing and corrosion.
>
> Also, you must turn the heater full-warm so it will drain as well.
>
> --
> TeGGeR®



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