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Old 11-29-2005, 12:01   #1 (permalink)
M White
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Heater Core Question

I think I just figured something out. In a previous thread I've described
how I'm getting no heat from my heater. When this truck was in the shop,
they told me the coolant looked like it had never been changed since 1994.
It looked like crap. I thought so too. (Just bought the truck used 2 months
ago.) It was leaking and I couldn't even identify what was leaking. It was
nasty coolant that ran like near sludge or oil.

My thought is, I know nothing about heater cores. Does the coolant run
through the core? If so, isn't it possible that crap clogged up the core?
Just a thought. I've heard someone mentioned clogged cores before. I've
bought a new one an will be installing it this evening if I can along with a
new t-stat. Just wanted some thoughts.

MW


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Old 11-29-2005, 12:01   #2 (permalink)
Jimbo
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Re: Heater Core Question

My limitted understanding is that your coolant does indeed run through
the heater core. My coolant level was low a few weeks back and I was
hearing a bubbling noise that I suspected was coming from the core.

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Old 11-29-2005, 18:01   #3 (permalink)
Advocate
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Re: Heater Core Question


"M White" <mike@avauntltd.com> wrote in message
news:XI1jf.19083$D13.13057@newssvr11.news.prodigy.com...
>I think I just figured something out. In a previous thread I've described
> how I'm getting no heat from my heater. When this truck was in the shop,
> they told me the coolant looked like it had never been changed since 1994.
> It looked like crap. I thought so too. (Just bought the truck used 2
> months
> ago.) It was leaking and I couldn't even identify what was leaking. It was
> nasty coolant that ran like near sludge or oil.
>

Did your shop flush your system when they pointed out you had a coolant
problem? Did they offer to?

You should have the old crap flushed out before you install the new heater
core.


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Old 11-30-2005, 05:01   #4 (permalink)
putt@webtv.net
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Re: Heater Core Question

>I know nothing about heater cores. Does
> the coolant run through the core?


Yes. The core is just like your radiator, only in a mini-version. The
heater hoses are connected to the engine cooling system. When the
coolant gets warm enough, the t-stat opens and lets coolant pass through
the entire cooling system, including the mini-radiator heater core. It
is very possible to clog the tubing within the core with 'junk'
circulating in the coolant. This is a bad thing for the core as it can
lead to creating holes in the core tubing, which equals a leak.
Breathing that antifreeze laden air in the cabin isn't good for the
lung things. Hopefully your cooling system was back-flushed before
replacing the coolant. If it wasn't, Prestone makes a back-flush kit,
about $5, and it does a very good job. Easy to install/use.....not
rocket surgery. You just need to capture the new antifreeze(big tub to
hold 3-5gal), follow the instructions, and then pour the AF back in when
the flush is done. Voila! BTW: another 'cheap insurance'/smart thing
to do, is to replace the radiator cap. Proper pressure in the cooling
system is important to the operation of the complete system. Replacing
it when performing maintenance is a good/smart thing. While I'm
spending your money, check or just go ahead and replace the radiator
hoses, heater hoses, and use new SS screw-type clamps. Apparently
little/no maintenance was done on the cooling system, so those hoses are
very 'suspect'....

Helpful, I hope

Dave S(Texas)

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Old 11-30-2005, 10:01   #5 (permalink)
M White
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Re: Heater Core Question

Yes, they flushed the system, thanks for checking.

MW

"Advocate" <Advo@hotmail.com> wrote in message
news:tY6jf.580504$x96.178313@attbi_s72...
>
> "M White" <mike@avauntltd.com> wrote in message
> news:XI1jf.19083$D13.13057@newssvr11.news.prodigy.com...
> >I think I just figured something out. In a previous thread I've described
> > how I'm getting no heat from my heater. When this truck was in the shop,
> > they told me the coolant looked like it had never been changed since

1994.
> > It looked like crap. I thought so too. (Just bought the truck used 2
> > months
> > ago.) It was leaking and I couldn't even identify what was leaking. It

was
> > nasty coolant that ran like near sludge or oil.
> >

> Did your shop flush your system when they pointed out you had a coolant
> problem? Did they offer to?
>
> You should have the old crap flushed out before you install the new heater
> core.
>
>



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Old 11-30-2005, 10:01   #6 (permalink)
M White
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Posts: n/a
Re: Heater Core Question - PROBLEM SOLVED!

Okay, to follow up because everyone likes a happy ending. I bought the
heater core, but never got around to messing with it. I installed a new
t-stat, but the old hoses back on. Then I called my ford truck freak of a
buddy and he had me mess with the heater control valve. As soon as I did
that, I started the truck and sure enough, HOT AIR!. So the good news is I
can get my $30 back for the heater core. The bad news is I don't know if the
t-stat fixed it or if the heater control valve was just sticky and needed to
be messed with.

Now here's the thing. My old t-stat passed the test, I think. I put it in
boiling water. But my truck runs very very cold. During September, after 4
hours of driving, the guage never even went past the "C" for Cold. It
registered, but not very far. Is it possible the t-stat didn't get hot
enough to open or the wax inside was bad/old and therefore needed more heat
than usual to open? I honestly think the new t-stat is what fixed it, but
you all can be the judges.

Thanks for all your help!

Enjoying a not so freezing drive to work and home nowadays,

MW
<putt@webtv.net> wrote in message
news:9626-438D95E3-1060@storefull-3275.bay.webtv.net...
> >I know nothing about heater cores. Does
> > the coolant run through the core?

>
> Yes. The core is just like your radiator, only in a mini-version. The
> heater hoses are connected to the engine cooling system. When the
> coolant gets warm enough, the t-stat opens and lets coolant pass through
> the entire cooling system, including the mini-radiator heater core. It
> is very possible to clog the tubing within the core with 'junk'
> circulating in the coolant. This is a bad thing for the core as it can
> lead to creating holes in the core tubing, which equals a leak.
> Breathing that antifreeze laden air in the cabin isn't good for the
> lung things. Hopefully your cooling system was back-flushed before
> replacing the coolant. If it wasn't, Prestone makes a back-flush kit,
> about $5, and it does a very good job. Easy to install/use.....not
> rocket surgery. You just need to capture the new antifreeze(big tub to
> hold 3-5gal), follow the instructions, and then pour the AF back in when
> the flush is done. Voila! BTW: another 'cheap insurance'/smart thing
> to do, is to replace the radiator cap. Proper pressure in the cooling
> system is important to the operation of the complete system. Replacing
> it when performing maintenance is a good/smart thing. While I'm
> spending your money, check or just go ahead and replace the radiator
> hoses, heater hoses, and use new SS screw-type clamps. Apparently
> little/no maintenance was done on the cooling system, so those hoses are
> very 'suspect'....
>
> Helpful, I hope
>
> Dave S(Texas)
>



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Old 11-30-2005, 11:01   #7 (permalink)
Advocate
Guest
 
Posts: n/a
Re: Heater Core Question - PROBLEM SOLVED!


> Now here's the thing. My old t-stat passed the test, I think. I put it in
> boiling water. But my truck runs very very cold. During September, after 4
> hours of driving, the guage never even went past the "C" for Cold. It
> registered, but not very far. Is it possible the t-stat didn't get hot
> enough to open or the wax inside was bad/old and therefore needed more
> heat
> than usual to open? I honestly think the new t-stat is what fixed it, but
> you all can be the judges.


You can't really rely on your gauge to be accurate...but if indeed your
temperature was running cold, your engine won't run correctly. If your temp
runs higher now, you will see much better fuel economy.


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Old 11-30-2005, 17:01   #8 (permalink)
GeoffP
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Posts: n/a
Re: Heater Core Question - PROBLEM SOLVED!


"Advocate" <Advo@hotmail.com> wrote in message
news:Yjmjf.587945$_o.491173@attbi_s71...
>
>> Now here's the thing. My old t-stat passed the test, I think. I put it in
>> boiling water. But my truck runs very very cold. During September, after
>> 4
>> hours of driving, the guage never even went past the "C" for Cold. It
>> registered, but not very far. Is it possible the t-stat didn't get hot
>> enough to open or the wax inside was bad/old and therefore needed more
>> heat
>> than usual to open? I honestly think the new t-stat is what fixed it, but
>> you all can be the judges.

>
> You can't really rely on your gauge to be accurate...but if indeed your
> temperature was running cold, your engine won't run correctly. If your
> temp runs higher now, you will see much better fuel economy.

--
Sounds as if your thermostat had failed in the open position. Most
thermostats these days do fail in the open position. Thermostat open, engine
doesn't get warm for a long time, ergo, No heat!
Geogg
>
>



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Old 12-01-2005, 08:01   #9 (permalink)
putt@webtv.net
Guest
 
Posts: n/a
Re: Heater Core Question -

>my truck runs very very cold. During
> September, after 4 hours of driving, the
> guage never even went past the "C" for
> Cold. It registered, but not very far.


Glad to know it's fixed! Hopefully the complete system will
stay...fixed. About the gauge: not very accurate. The main thing you
want from the gauge is to know if the engine is over-heating.
Installing a good water temp gauge, along with a mechanical oil-pressure
gauge is a good thing. Knowing the engine temp is a....comfort.
Spring/Summer/Fall/Winter the engine should be in the 210-220
range....NOT(normal operating temp). Of course this NOT range is
dependant on the proper heat-range T-stat, and a good radiator cap(among
other more important/expensive parts) . For good heater operation the
stat should be at least a 180 unit. "messing" with that valve...at
least you have 'a place to look' now, after the t-stat replacement.
Hopefully the system will stay fixed throughout the cold times!

Dave S(Texas)

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Old 12-02-2005, 09:01   #10 (permalink)
Ulysses
Guest
 
Posts: n/a
Re: Heater Core Question


<putt@webtv.net> wrote in message
news:9626-438D95E3-1060@storefull-3275.bay.webtv.net...
> >I know nothing about heater cores. Does
> > the coolant run through the core?

>
> Yes. The core is just like your radiator, only in a mini-version. The
> heater hoses are connected to the engine cooling system. When the
> coolant gets warm enough, the t-stat opens and lets coolant pass through
> the entire cooling system, including the mini-radiator heater core. It
> is very possible to clog the tubing within the core with 'junk'
> circulating in the coolant. This is a bad thing for the core as it can
> lead to creating holes in the core tubing, which equals a leak.
> Breathing that antifreeze laden air in the cabin isn't good for the
> lung things.


If you notice a film on the inside of your windows your heater core may be
leaking. I've had this happen on two Ford trucks and it was not enough of a
leak for it to drip. The windows always needed to be cleaned.

Hopefully your cooling system was back-flushed before
> replacing the coolant. If it wasn't, Prestone makes a back-flush kit,
> about $5, and it does a very good job. Easy to install/use.....not
> rocket surgery. You just need to capture the new antifreeze(big tub to
> hold 3-5gal), follow the instructions, and then pour the AF back in when
> the flush is done. Voila! BTW: another 'cheap insurance'/smart thing
> to do, is to replace the radiator cap. Proper pressure in the cooling
> system is important to the operation of the complete system. Replacing
> it when performing maintenance is a good/smart thing. While I'm
> spending your money, check or just go ahead and replace the radiator
> hoses, heater hoses, and use new SS screw-type clamps. Apparently
> little/no maintenance was done on the cooling system, so those hoses are
> very 'suspect'....
>
> Helpful, I hope
>
> Dave S(Texas)
>



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