lmfao
u have the pride of ford
a 3.8
hope your heads are warped
what kind of tard buys a 6 cyl mustang
honestly

hurc ast

   Sounds like the radiator may be clogged.  You
really can't boil them out any more, you just have to
replace them.
    There is a possibility of a blown head gasket or
cracked head.  Have the coolant tested for products of
combustion.
    As for the water pump, I probably wouldn't replace
it based on a whining noise.  That noise could be
coming from the water pump, P/S pump, air pump, etc.
     Do you have an electric fan only (not stock)?  If
so, it may not be up to the job any more.

If it's still got the original fan clutch my first move, since you
already done the other obvious stuff, would be to buy a new, heavy
duty fan clutch and install it.  Doing that made a big difference in
around town driving on the 93 5.0LX I used to have.  If I was going to
start replacing things after that I'd start with the radiator before
I'd mess with the water pump. Flushing is not likely to have cleaned
out much of the really hard stuff that could be clogging it.
--
Jim
'88 LX 5.0 (now in car heaven)
'89 LX 5.0 vert
'99 GT 35th Anniversery Edition - Silver
Mods to date - Relocated trunk release to drivers side,
shortened throttle cable, PIAA Driving lights.

Make sure you've gotten all the air out of the block by bleeding using
bolt on top of engine (which is there just for that purpose)
.. You'd be surprised at how much difference a little air trapped
inside engine can cause.

What do you mean when you say "it runs poorly"

I had a 1998 v6 stang, and when I had a terrible rough idle problem I
replaced the IAC and it went away. It's around $11 at autozone.

"tarzan" wrote in a message:

If it runs normal without the A/C on, then the reason it runs warmer with
the A/C on is just that.  Remember, the condenser is in front of the
radiator, and its job is to cool the freon, and turn it from a liquid to a
gas. The heat has to go somewhere, and since the air that moves through the
condenser, also passes through the radiator, some of that heat is picked up
by the radiator. As for the water pump, slowly remove the radiator cap as it
starts to warm up, and watch the coolant flow. If it is barely moving after
the thermostat opens up, then I'd say replace the pump. But if it is moving
real good, I wouldn't bother. One thing you can try is adding some water
pump lube/conditioner to the coolant, if you suspect the noise is coming
from the pump itself.

Gary

Performance, not horsepower, and ride make the 6-cyl. experience.  RPM 2000
out of a safe 5,500 at 65MPH leaves a lot of engine for cruising, as does
pure highway MPG -- about 28 on mine -- for a range exceeding 400 high speed
miles on a full tank.

I lost an alternator this weekend with not much warning from the battery
gauge, but the impression I've drawn so far from 2000 V6 is that when it's
working, everything works 100 percent right.  IMHO, find an experienced
mechanic you trust (there's a bit of work and luck in that all by itself),
give him ownership of the maintenance of the vehicle, and then take his
advice and insight seriously.  What that means here: if you trust your
mechanic, and he suggests working on the cooling system, go ahead and get
that work done.  (The shop owner who oversees work on my pony came through
personal referral; the employee who actually gets into the grease, and not
much of that yet,  is a Mustang enthusiast himself with a restoration
project in his own garage).

I'd be happy to listen to modification proposals that might yield additional
horsepower without degrading fuel efficiency in the 3.8L 6-cylinder, but
call it a "grocery getter" or "secretary's car", whatever, it's not a racing
machine.  What it is is a great ride and plenty fast through the spectrum of
legal or accepted -- interesting concept -- U.S. traffic flow speeds.  The
class probably deserves more enthusiasm and interest than it has gotten, but
the predominant sports car culture has developed around the allure of
competitive power and track or combative speed at the expense of comfort,
efficiency, and socially sustainable high speed.

--Jim