It should be on the bottom of the radiator.
The thermostat should have a air bleed valve built in and the air bleed valve should be facing straight up.
It's on the upper radiator hose that runs to the back of you engine. It's a little screw that is on a metal connector. I know because we have a 2000 Cavalier with it on that hose.
The Villager engine does not have a coolant bleed valve.
there isnt one after 1996
Sounds like you have an air pocket. Check to see that your coolant is completely topped up and that you have opened any bleeder valve to bleed the air out of the cooling system. Not all engines have a bleeder valve so check this out in a shop manual.
It most likely has an air bubble. Allow engine to cool completely. Find bleeder valve and open to remove air bubble. This may require adding coolant. Close valve when coolant comes out. Fill reservour to correct level and go for a spin.
there is a bleeder valve on the right side of the tranny that is where you can bleed your system
If the car temperature comes up to operating temperature remains stable. If the heat from the vents seems ok as long as the rpm is above 2000rpm but heat from the vents stops when the car is stopped in traffice. Then the auxilary coolant pump may be bad. The auxilary coolant pump is a pump in the heater water lines and provides most of the hot water flow to the heater cores. Some hot water flow will exist just from the main water pump but only if the motor is at 2000 plus rpm. The system may have air in it, or be low on coolant. Top off the coolant. Bleed the air out using the bleeder valve attached to the degas bottle (aka coolant expansion tank), revving engine at 2000 rpm with the heat on full blast. Open the bleeder valve until coolant flows steadily. Repeat.
The crossover tube has an O ring at the end, it is plugged into the intake manifold and held in place by 2 screws. See pictures here: http://leckemby.net/windstar/windstar01.html
where is the tcm in a windstar 2000 located
There are several reasons why your heat may not work. First your coolant system must be full with NO AIR pockets. There is a bleeder valve for the coolant system, in the area of the coolant recovery bottle, by the strut tower and the firewall. Have the vehicle running and open the valve, be careful coolant can be hot. Make sure you are full of coolant by checking the recovery bottle. If nothing comes out of the vent then you need to wait till coolant comes out.Another problem could be the heater control valve and or the thermostat. They are in the front center on top just under the cover and the air intake.The water pump might or the thermostat housing might be leaking, creating a leak that will allow air to enter. The older style of pumps were well known for leaking.