I have a 92 Taurus that seems to be overheating. The Temp gauge will
get up near the high end Hot. It seems to be intermitent. Sometimes
it runs cool and sometimes hot. I have tried replacing the thermostat
and running some radiator cleaner through the system. The coolant
that I drained had lots of rusty orange in it. I had the head gaskets
replaced about 2 years ago. The car has about 89000 miles on it.
Are these symtoms from a blocked radiator. What are my options? Is
it hard to take the radiator out on this car and have it flow tested?
Can these radiators be rodded out?
pump like another poster suggested so you can forget that.. if you have
rusty water in the radiator then you probably have water in the system
and not coolant... that would make it run hot as the plain water boils
over at 212 F whereas the 50/50 mix of coolant to water will go about
260 deg. before it boils over.. if you are interested in a new radiator
they cost about $115 at www.radiators.com and alot of local places that
sell wholesale radiators. they are not worth trying to fix the plastic
radiators.. they wanted $75 to work on mine.. a few dollars more and you
get a new one... with a 92 taurus its about time for new hoses both
upper and lower radiator hoses.... its four bolts to get the old
radiator out and the two connections from the auto/trans cooler lines to
the radiator and how about a new rad. cap just in case it blows its
pressure before the 16 lbs. that it is suppose to hold,, mine would blow
it at 4 lbs. of pressure ( found this out with a test)....
Plain water has the best thermal conductivity and therefore cooling. Coolant
helps: stops rust and lowers freeze point due to the alcohol (presuming its
It the pressure cooling systems run that raises boiling point. This is a
function of the radiator cap and air-tightness of hoses etc.
A normal thermostat runs well below 212f or 100c. Any car (with the
exception of some earlier models) which is running at or near 212f has a
Absolutely right. Some newer cars CANNOT function without a pressurized
cooling system because the normal "hot spot" temperatures in the cooling
system are above the boiling point of a water/coolant mix at atmospheric
pressure. The higher temps help fuel efficiency and lower emissions, but
pretty much rule out the old option of "limping home" with the radiator
cap off if you blow a hose and have to wrap it with duct-tape...
The point was, you were impying his problem may have been due to not running
coolant. This is not so. Any car which is relying on the higher boiling
point of a coolant mix (beyond that of water at atmospheric pressure) to not
boil, has a systemic fault in its cooling apparatus.
High boiling points of coolant only afford protection when a car is
operating at an extreme condition where its coolant had progressed well past
the normal operating temp of the engine (as set by the thermostat) by a
The original posters problem is separate to which coolant he is operating.
Define what "Hot" means? Is it in the red, or just hotter than
normal? Another thought. Your cat could be partially clogged
causing the motor to run hotter than normal. I think ford recalled
our 90 at one time and put one on for free.
Just a note: Careful if you buy a new radiator. I bought a dual core
for my 93 thinking for a few bucks more its the way to go.
I could barely get the dam fan back on with the extra space it took.
If i did it again, i think i would have just got the stock one.
Everything went fine until i tried to shoe horn the fan back on the
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