Yet another taurus heater core problem - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
ยป Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Fordforums Community > USENET NewsGroups > alt.autos.ford
Register Home Forum Active Topics Photo Gallery Auto Loans Garage Mark Forums Read Auto Escrow

FordForums.com is the premier Ford Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 12-21-2005, 19:01   #1 (permalink)
Paul W
Guest
 
Posts: n/a
Yet another taurus heater core problem

My Dad's 99 Taurus seems to have been having the same clogged heater
core
problems that have been reported by numerous posters here. He had the
system
flushed by his regular mechanic at the start of last winter, which
helped somewhat
but did not return the heat to full operation. With the onset of cold
weather in November,
it was obvious that the heater performance had declined again, so he
had his mechanic do
another flush, this time with a special "high pressure" flush system
the garage had just
gotten. The heater performance remains very poor. I discussed the
problem with the mechanic, who mentioned that the heater core had a
bypass tube, which, if clamped
shut, improved the heater performance. He was a little confused
because he had
apparently never seen a bypass straight across the heater core like
this.

From what I have read of others comments here, it seems that the
problem is
relatively easily solved by doing a thorough backflush, and that the
poor results
other posters (and my dad as well, probably) have got from having
mechanics do the
flush is that they don't seem to persist until the core is completely
cleared (which may
take 3-4 flushes). My questions are:

1) From some posts, I get the impression that the bypass was put on
the heater
core as part of a recall fix. Can anyone tell me the problem
that was being fixed,
and why/how the bypass fixes it?

2) Since the heater performace improves substantially with the
bypass clamped shut,
is there any damage likely to be created by just leaving it
clamped shut until I can
get around to doing a thorough backflush? (Morning temps are
less than 10 F the
last few days...)

thanks in advance,

Paul

  Reply With Quote
Sponsored Links
Advertisement
 
Old 12-22-2005, 21:01   #2 (permalink)
Ernest Scribbler
Guest
 
Posts: n/a
Re: Yet another taurus heater core problem

"Paul W" wrote
> Can anyone tell me the problem
> that was being fixed,
> and why/how the bypass fixes it?


Assuming we're talking about the 3.0 pushrod engine, here's the TSB that
includes the bypass hose: http://blizzard.zmm.com/waterpump/BrownCoolant.pdf

As you can see, there's no real explanation of what the hose does. I've
heard a couple of different guesses as to the purpose of the bypass hose,
but none that made much sense. I can assure you, though, that with the hose
in place, as long as everything else is working, you'll have plenty of heat.

There are really only two likely causes of low heat on these cars: either
the core is blocked or the water pump is weak. (Of course it could be both)
Since you've had the core flushed and it didn't help, the pump becomes the
next logical suspect. The water pumps on these cars have an unusual failure
mode in that the pump's impellor degrades very badly, but typically the
engine temperature is seemingly unaffected. I wouldn't be at all surprized
if a perfectly competent mechanic who hasn't seen this problem before tells
you that it can't be the water pump. I wouldn't have believed it if I hadn't
seen it for myself: http://blizzard.zmm.com/waterpump/


  Reply With Quote
Old 12-22-2005, 22:01   #3 (permalink)
Rick
Guest
 
Posts: n/a
Re: Yet another taurus heater core problem


"Paul W" <pwilden@earthlink.net> wrote in message
news:1135215475.573243.308910@z14g2000cwz.googlegroups.com...


Sniiped stuff


> 1) From some posts, I get the impression that the bypass was put

on
> the heater core as part of a recall fix. Can anyone tell me the

problem
> that was being fixed and why/how the bypass fixes it?


The problem was poor flow balance and/or low total flow through the
block at closed and small stat openings. The bypass was added and the
pump impeller was redesigned to improve the balance and a few other
characteristics. A 3 mm restrictor was added in the degas line to
reduce coolant aeration in the system.

If I recall correctly pre '96 systems had a bypass but no degas
bottle, but don't hold me to that. Can't say if your vehicle has the
new impeller style. Hard to tell if you would have any problems by
clamping off the bypass...


  Reply With Quote
Old 12-23-2005, 09:01   #4 (permalink)
El Bandito
Guest
 
Posts: n/a
Re: Yet another taurus heater core problem

Wow....

That's scary...

--

(\_ _/)
(='.'=) This is Bunny. Copy and paste bunny into your
(")_(") signature to help him gain world domination.
"Ernest Scribbler" <replies@newsgroup.only.please> wrote in message
news:4qydneYmJLzN7zbenZ2dnUVZ_sadnZ2d@adelphia.com...
> "Paul W" wrote
>> Can anyone tell me the problem
>> that was being fixed,
>> and why/how the bypass fixes it?

>
> Assuming we're talking about the 3.0 pushrod engine, here's the TSB that
> includes the bypass hose:
> http://blizzard.zmm.com/waterpump/BrownCoolant.pdf
>
> As you can see, there's no real explanation of what the hose does. I've
> heard a couple of different guesses as to the purpose of the bypass hose,
> but none that made much sense. I can assure you, though, that with the
> hose in place, as long as everything else is working, you'll have plenty
> of heat.
>
> There are really only two likely causes of low heat on these cars: either
> the core is blocked or the water pump is weak. (Of course it could be
> both) Since you've had the core flushed and it didn't help, the pump
> becomes the next logical suspect. The water pumps on these cars have an
> unusual failure mode in that the pump's impellor degrades very badly, but
> typically the engine temperature is seemingly unaffected. I wouldn't be at
> all surprized if a perfectly competent mechanic who hasn't seen this
> problem before tells you that it can't be the water pump. I wouldn't have
> believed it if I hadn't seen it for myself:
> http://blizzard.zmm.com/waterpump/
>



  Reply With Quote
Old 12-23-2005, 17:01   #5 (permalink)
Jimbo
Guest
 
Posts: n/a
Re: Yet another taurus heater core problem

"Ernest Scribbler" <replies@newsgroup.only.please> wrote in message
news:4qydneYmJLzN7zbenZ2dnUVZ_sadnZ2d@adelphia.com...
> "Paul W" wrote
>> Can anyone tell me the problem
>> that was being fixed,
>> and why/how the bypass fixes it?

>
> Assuming we're talking about the 3.0 pushrod engine, here's the TSB that
> includes the bypass hose:
> http://blizzard.zmm.com/waterpump/BrownCoolant.pdf
>
> As you can see, there's no real explanation of what the hose does. I've
> heard a couple of different guesses as to the purpose of the bypass hose,
> but none that made much sense. I can assure you, though, that with the
> hose in place, as long as everything else is working, you'll have plenty
> of heat.
>
> There are really only two likely causes of low heat on these cars: either
> the core is blocked or the water pump is weak. (Of course it could be
> both) Since you've had the core flushed and it didn't help, the pump
> becomes the next logical suspect. The water pumps on these cars have an
> unusual failure mode in that the pump's impellor degrades very badly, but
> typically the engine temperature is seemingly unaffected. I wouldn't be at
> all surprized if a perfectly competent mechanic who hasn't seen this
> problem before tells you that it can't be the water pump. I wouldn't have
> believed it if I hadn't seen it for myself:
> http://blizzard.zmm.com/waterpump/

I can confirm the pump failure but without the photographic evidence. The
old pump impeller was essentially a disc. I replaced the pump because the
seal was gone and I had drip warning.

Jimbo


  Reply With Quote
Old 12-24-2005, 02:01   #6 (permalink)
sdlomi2
Guest
 
Posts: n/a
Re: Yet another taurus heater core problem


"Paul W" <pwilden@earthlink.net> wrote in message
news:1135215475.573243.308910@z14g2000cwz.googlegroups.com...
> My Dad's 99 Taurus seems to have been having the same clogged heater
> core
> problems that have been reported by numerous posters here. He had the
> system
> flushed by his regular mechanic at the start of last winter, which
> helped somewhat
> but did not return the heat to full operation. With the onset of cold
> weather in November,
> it was obvious that the heater performance had declined again, so he
> had his mechanic do
> another flush, this time with a special "high pressure" flush system
> the garage had just
> gotten. The heater performance remains very poor. I discussed the
> problem with the mechanic, who mentioned that the heater core had a
> bypass tube, which, if clamped
> shut, improved the heater performance. He was a little confused
> because he had
> apparently never seen a bypass straight across the heater core like
> this.
>
> From what I have read of others comments here, it seems that the
> problem is
> relatively easily solved by doing a thorough backflush, and that the
> poor results
> other posters (and my dad as well, probably) have got from having
> mechanics do the
> flush is that they don't seem to persist until the core is completely
> cleared (which may
> take 3-4 flushes). My questions are:
>
> 1) From some posts, I get the impression that the bypass was put on
> the heater
> core as part of a recall fix. Can anyone tell me the problem
> that was being fixed,
> and why/how the bypass fixes it?
>
> 2) Since the heater performace improves substantially with the
> bypass clamped shut,
> is there any damage likely to be created by just leaving it
> clamped shut until I can
> get around to doing a thorough backflush? (Morning temps are
> less than 10 F the
> last few days...)
>
> thanks in advance,
>
> Paul
>

See "from 'Finnick'", above. Seems he put a restrictor in that bypass
hose to slow down the flow thru it & improved heater performance greatly. s


  Reply With Quote
Old 12-24-2005, 21:01   #7 (permalink)
Ernest Scribbler
Guest
 
Posts: n/a
Re: Yet another taurus heater core problem

"Rick" wrote
> The problem was poor flow balance and/or low total flow through the
> block at closed and small stat openings.


Wouldn't low flow be normal when the thermostat is fully or partially
closed?


  Reply With Quote
Old 12-24-2005, 23:01   #8 (permalink)
Rick
Guest
 
Posts: n/a
Re: Yet another taurus heater core problem


"Ernest Scribbler" <replies@newsgroup.only.please> wrote in message
news:Cemdndy-l-1AiTPenZ2dnUVZ_sOdnZ2d@adelphia.com...
> "Rick" wrote
> > The problem was poor flow balance and/or low total flow through

the
> > block at closed and small stat openings.

>
> Wouldn't low flow be normal when the thermostat is fully or

partially
> closed?



Generally lower than fully open, yes. However, there is a minimum flow
needed for safe operation at various engine conditions.....


  Reply With Quote
Old 12-25-2005, 20:01   #9 (permalink)
Ernest Scribbler
Guest
 
Posts: n/a
Re: Yet another taurus heater core problem

"Rick" wrote
>>> The problem was poor flow balance


The brown coolant TSB mentions "bank to bank coolant flow imbalance" as one
of the possible causes. I've never really understood exactly what that
means. "Bank" to me would mean one side of the V, as in the front set of
three cylinders is getting more or less coolant flow than the rear set. But
then how the bypass hose in the heater line might affect that seems a little
voodooish.

At any rate, Paul shouldn't have to restrict the bypass hose to get heat.
There's something wrong in his cooling system. (My money's on the water
pump.) My bypass and a whole lot of others are unrestricted and our heaters
work fine.


  Reply With Quote
Old 12-25-2005, 22:01   #10 (permalink)
Rick
Guest
 
Posts: n/a
Re: Yet another taurus heater core problem


"Ernest Scribbler" <replies@newsgroup.only.please> wrote in message
news:pYSdnfwNf8m6xDLeRVn-qQ@adelphia.com...
> "Rick" wrote
> >>> The problem was poor flow balance

>
> The brown coolant TSB mentions "bank to bank coolant flow imbalance"

as one
> of the possible causes. I've never really understood exactly what

that
> means. "Bank" to me would mean one side of the V, as in the front

set of
> three cylinders is getting more or less coolant flow than the rear

set. But
> then how the bypass hose in the heater line might affect that seems

a little
> voodooish.


That's correct, but it's normally called left and right (as viewed
from the rear of the engine)

No voodoo involved at all...


> At any rate, Paul shouldn't have to restrict the bypass hose to get

heat.
> There's something wrong in his cooling system. (My money's on the

water
> pump.) My bypass and a whole lot of others are unrestricted and our

heaters
> work fine.




  Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Fordforums Community > USENET NewsGroups > alt.autos.ford



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are Off
[IMG] code is Off
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 14:09.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.