1996 Chevy Cavalier What is the metal pipe called that runs across the top of the engine... is secured to the manifold, and has the bleeder screw in it?

The 3.1 Engine has a small brass bleeder located in the pipe that runs from the water pump across the top of the valve cover at the front of the engine, as well as sometimes located on the thermostat housing.

If you look on the passenger front of the engine you should see a pipe coming up from the water pump housing. There should be a bleeder screw on the top. use a 9/32" socket to loosen the bleeder. Start the engine and keep bleeder open until coolant comes out. Close it and let the engine come up to temp while periodically opening the bleeder to let any additional air out. Keep an eye on the coolant level and top off as necessary.

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The Chevy Cavalier has a intake which take in the air from outside. If you pop your hood you should see the following..

http://dealerrevs.com/gallery/42319343.html

The black square is the intake box and the black pipe is the intake arm. If you follow it you should see where your engine is getting air from.

Also, after the piston pushes the exhaust out of the exhaust manifold and its on the downstroke, that downstroke actually produces suction which pulls in air.

Hope that helps!

bleeder screw on metal water pipe above inlet manifold. loosen bleeder screw, fill coolant at coolant resivoir untill all air pushed out bleeder.

the most commen problem with no heat is an air lock in the cooling system
when the vehicle is cold remove the rad cap
then there is a air bleed screw on the coolant pipe that goes across the front valve cover open the bleed screw about 3/4 to a full turn
use a funnel and over fill the rad into the funnel (this will make a mess)
make sure you have a steady streem of coolant coming out of the bleeder when you have a steady streem close the bleeder then there is a bleeder screw on the thermostat hosing open it and when you have a steady streem from it close that one then put the rad cap back on
and start the vehicle put your heat controls on VENT ,HOT AND HIGH BLOWER SPEED
run the vehicle and make sure you have HOT AIR COMMING OUT OF THE VENTS NOT WARM if its just warm then shut the engine off and open the bleeder on the pipe not the T-STAT HOUSING
keep repeating till you get HOT AIR COMMING FROM THE VENTS
top up the over flow bottle the rad will be fine
hope this helps

Fill the resovoir full of coolant then put the cap on. Start the car and let the tempture get about 160 -190 depending on your thermostat. Then proceed to turn the motor off. While the motor is off locate the bleeder valve that is loacted on a metal pipe that runs to the side of the head, Slowly turn the bleeder valve between 3/4 to a full rotation then begin to let the system bleed until there is a steady stream of coolant exiting the valve. Start the vehicle again and repeat till resovoir is full and there is absolutley no air in the system. Failure to do so will result in vapor lock and ultimatley coolant system failure

it should be in the top of the intake manifold, the air cleaner tube goes into the throttle body and there is a little line that runs from the air cleaner tube into the pcv value and is screwed into the intake manifold.

dr_greg is incorect. The bleeder valve is on the thermastat housing near the intake manifold. Follow the hose from the top of the radiator to the the engine. Look for something that looks like a 12mm head nut with a metal nipple comming through it. If you change your coolant but do not open this valve untill coolant flows from it you may cause an air pocket to remain in your engine, possibly causing your car to over heat.

2.2 OHV
Follow the metal tubes running across the front of the engine, you will see a small bleeder.
1/4" bleeder open it till it leaks fluid.

Thats a Dealer part only (if its the Coolant Bleeder). Last I checked they DO NOT manufacture the Bleeder "Block" (on which the valve originally resides on the stock bleeder). The new OEM product consists of the block (w/o bleeder valve) and your top coolant piping (which now is manufactured with the beleder valve on it - [on the piping itself]) that runs to the upper radiator hose towards the front of the engine and through the "V" of the block. Count on taking a whole day executing this. But can be done with all DIY hand tools. You will need to disconnect any and all sensors/lines in the way of the intake manifold, as it will have to be taken off while you replace the assembly as a result of Chrysler's wonderful new design for thier bleeder valves for the 2nd gen Intrepids. (Stupid Chrysler)