If the engine warms up OK, it's probably the blend door actuator that
has gone bad. but if you have climate control, it could be the ATC
control unit. The owner's manual usually has the self test for the ATC
in it, and it's also available many places online.
A friend who worked at the local Ford dealer, said it was delt with,
but not enough.. there was supposed to be some kind of sealer, which
would prevent the erosion from happening..
Contrary to someone else's remark, of it being cavitation, hardly..
Cavitation is caused by a
lack of water, and a vaccume is caused, by the water beginning to
actually boil, til it
suddenly gets a brief amount to lower the vaccume, where it litterally
hammers the entire
system. (firefighter, same thing happens if running a pump too hard,
without enough water
through the hoses to supply.. Blown quite a few steamer caps (main
inlet caps) off trucks,
and masacured too many impellers that way.)
the true cause, is the dissimilar metals, and electrolytic action. add
the cast iron block & heads, add a aluminum pump chamber, and a mild
steel impeller just sitting in the middle. the result, the slight
acidity to the antifreeze etches the mild steel.
I ran into the exact same problem, with a 1999 vulcan (3.0 V6 OHV) and
it cost me dearly, to get it back roadworthy again. (2 sets of head
gaskets, new pump, new radiator, machining to the read head to
eliminate warpage, serpintine belt) Mine didn't look as bad as the 1st
photo (image002.jpg), it still had the points left, but resembled a
martial arts throwing star.
the friend said they were coming in, in waves once the problem
appeared.. All they could do, was replace the pump, and whatever
damage, and send them on, till the sealant was used.. but even that
wouldn't stay. (rust on the block internals, it couldn't adhear.)
Yes, the problem was partially electrolysis and corrosion but cavitation as
Cavitation in the cooling system is well known to folks who deal with diesel
The theory is exactly as you describe but on a much smaller (molecular) scale.
combustion pulses cause micropulses in the cooling system along with harmonics
those micropulses. This causes the coolant molecules to separate into gas that
to coat the hot internal surfaces of the engine. Vibrations shake the bubbles
allowing contact with liquid which causes rapid cooling of that tiny area. These
eventually erode. Impurities then leach out of the eroded metal and cause
the cooling system. They also cause the PH in the coolant to become acidic,
severe electrolysis and erosion of the water pump impeller.
If your "friend" is a Ford tech and has been properly briefed on this
SHOULD know this. (BTW, In Ford speak, a problem is only a "problem" if they
fix. Until then, it's a "concern")They "came in waves" in about 1999-2003. There
NO SEALER EVER INVOLVED in the Brown Coolant recall or recommended afterward.
pumps weren't replaced, as a rule, either.
I did MANY "Brown Coolant" recalls on Tauri at the dealer during this period.
systems were flushed with a highly alkalne solution, flushed, and the proper mix
ethylene glycol added. There were also bypass hoses added to the cooling system
alleviate the cavitation. I always thought that the water pump and core plugs
have been replaced on all of those vehicles. They have been an area of concern
then on used Tauri.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.