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Re: coolant leak ford aerostar 1996
SOUNDS LIKE THE BEARING PACKING IS STARTING TO LEAK IN THE WATER PUMP. YOUR ONLY SOLUTION IS TO REPLACE THE PUMP. IF YOU GET UNDERNEATH AND LOOK UP AT THE BOTTOM OF THE WATER PUMP YOU WILL SEE A SMALL WEEP HOLE AND THERE YOU WILL SEE THE WATER COMING OUT TO VERIFY IT IS YOUR WATER PUMP AND NOT ANOTHER ISSUE.
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Aerostar, gotta' be an old one. What year? They were made form 1986 to 1997. The newest it could be is 16 years old. So, the most likely possibilities with no more info than you've provided would be that the radiator could be clogged with calcium deposits; the fan clutch could be worn out.; the water pump could be bad.
How rusty was the coolant that came out when you replaced the thermostat? I've seen those 3.0 liter Fords with the water pump impeller blades worn completely off from pumping abrasive rusty coolant. Usually rusty coolant ends up meaning a bad head gasket which pumps air into the coolant and makes an air pocket under the thermostat and keeps it from opening because the air insulates the thermostat wax element. If the thermostat doesn't open because of air pockets, engine overheats.
4.0 liter engine not so common. Different problems, what do you have? Need more information to help you more.
If the coolant is coming out of the one that's more to the center of the engine, it's going to be your water pump, when water pumps go bad they will leak coolant out, water pumps have a little hole in back of the pulley, that when the seal goes bad it will leak coolant through there.
Park your car overnight and put a large white piece of paper
underneith your car. In the morning check the paper. If the paper is
wet with liquid, you could have a water pump leak.
If the paper has green (in most cases) fluid on it, there is a
good chance your vehicle is leaking coolant (sometimes refered to as
"water"). In many cases, when you are leaking coolant it could be
coming from the water pump.
Turn the engine off and open the hood.
Locate the water pump pulley. The pulley is the round part
that the belt is attached to. To find it, look for the belts. You will
see more than one pulley. Your car will have an alternator with a pulley
and perhaps an air conditioner,
power steering and smog pump pulleys. If you are unsure, ask your
mechanic to point out the water pump pulley.
Grab opposite ends of the round pulley and check for "play"
(looseness): Try to rock it back and forth. There should be no give. If
there is, the bearings are going and it's time to replace the water
pump. By the time you can feel play in the water pump pulley, you may
also be able to hear the bad bearing when the engine is running - there
may be a low-pitched grinding noise coming from the water pump pulley.
Visually check the water pump (it's located behind the
pulley) for signs of a coolant leak. If the water pump gasket is
leaking, it must be replaced. This is a good time to get a new water
pump, too, unless it was just recently replaced
It is the water pump most likely,they have ,what they call a weep hole in the bottom under the pulley,so they will leak out to let you know to change them right away.If it is on the top coming from the intake area,it would be the intake,they are also bad to leak,but look at the pump,under the pulley.
Pretty easy for average mech. first drain coolant by loosening the
lower radiator hose. Make sure to have a drain pan. remove the power
steering belt by removing the bolts to the idler pulley. and let belt
off the pulley.remove the alternator upper bracket. and remove belt. Take fan shroud off with two 8mm bolts on top oe it. You cant remove
untill you remove the clutch fan assembly. It is left handed thread. It has
to be removed together. Remove the four bolts to the pulley on front of
water pump. and then remove all 14mm bolts around the pump. Then remove
8mm bolts and it will be able to come off. assemble in reverse order!
Could be the water pump or the serpentine belt is slipping on the water pump pulley. Is the radiator coolant hot? If it is, the coolant is not circulating through the block and heater core. I am assuming you see and hear no leaks and you have installed the thermostat in the correct direction to match the coolant flow.You should be able to squeeze the radiator hose before the thermostat and feel it expand when you have the engine running. You might be able to splice a hose with a T connection and valve to see the flow. Otherwise you would have to take out the pump and check the impeller.
The water pump will be on the serpentine assembly. It'll have a little hole on the shaft that connects with the pulley. If it's leaking out of the weep hole, your water pump is bad. You can also check the bearings by removing the belt, grasping the pulley, and try rocking it back and forth, up and down. If it moves, your bearings are bad and you'll have to replace the water pump.
I believe your thermostat is stuck in the closed position. It's not allowing coolant to circulate and cool off in the radiator. The water coming out of the tube is from the radiator overflow tube. The super-hot coolant is expanding and has no where to go since the thermostat is stuck. Replace the thermostat and use a new gasket set. Its an easy job if your handy with tools.