There are 2:
The first is on the top of the thermostat housing. To find it, follow the upper radiator hose from the radiator to the thermostat housing. It will probably be buried underneath part of the air filter duct and throttle cables, but visible without moving anything. The bleeder screw is very small, and enters the top of another, slightly larger bolt.
The second is on top of the water pump. It will look just like the one on the thermostat. The location of the water pump varies slightly with the size of the engine, but is usually in the same general location, on the left side of the engine. It will be near the lower radiator hose. On most 3.1L engines, the lower radiator hose connects right to the water pump. This is usually true of 3.8L engines as well, but not always.
Good luck.
There is air in my manifold and can't find the bleeder valve to release it so how do i bleed my manifold?
open bleeder on engine by the upper hose outlet.
The thermostat should have a air bleed valve built in and the air bleed valve should be facing straight up.
Where is the coolant bleeder valve located on a 2003 nissan maxima 3.5
If there is one - it should be located in the top of thermostat housing
After you have completed work on the cooling system and you begin to replace the coolant, open the bleeder a couple turns. As you pour coolant into the reservoir air trapped will escape out the bleeder. As soon as you see coolant come out of the bleeder close the bleeder valve and continue to add coolant to the reservoir until you have reached the full mark. Replace cap on reservoir. Allow vehicle to run through a drive cycle and cool down. Top off reservoir to full mark if necessary.
I don't know where specifically they would be (if there are any at all...), but on most of the engines I have worked on that have had them, they were in the engine block somewhere, with the intended purpose of a drain, not an air bleed. I don't think many modern cars (if any at all) have bleeder screws for coolant.
You can't bleed it any other way, you have to bleed it through the bleeder valve to get all the air out.
If it has bleeder valves then use them to bleed the system, if not, jack up the front of the vehicle as high as possible. Remove the radiator cap and start the engine. Add coolant to keep the system full. This will allow air to escape.
not all cars have bleeder valves; it may be located on the intake manifold or the pipe neck that the radiator hose goes into
It should be a bleeder screw connected to the cooling system, it might be two.If you find it,you should open one at a time.Pour coolant into the system slowly,until coolant start coming out of the bleeder screw and then close it . DO it to the second screw too.Now if you do not have the bleeder screws.Pour coolant into your system slowly and squeeze the top hose until no bubbles come out and the coolant level should go down at this time and then pour alittle more in there
The "bleeder screws" that come to mind are:Brake bleed - found at each wheel caliper / wheel cylinderEngine coolant - NOT found on a Windstar engine. Cooling system bleeding/burping is basically through just running the engine with the coolant reservoir cap off.