If you're turning on your heat and cold air is coming out, then this is what you can try. You have to get behind the glove box. Open the glove box, and just find all the screws that are holding the actual "box" part on door. Once this is out, you should be able to see a some wires and body paneling. Feel behind the lower left side of the glove box and try and find a lever which will move up and down. This lever switches your vents from the heating core to the A/C. Start up your car and put the heat on full blast. Then, while feeling the lever, push the "max A/C" button. If this lever doesn't try to move, there is your problem. Try using a rubber band to hold the lever in the heating position. You won't be able to use the A/C once the lever is bound, but when summer comes, just take off the rubber band.
I need to know how to place it,and where is it located at on the car
You have to connect the both hoses that go into the heater core on the passenger side but that will throw codes and you will have a light on the dash
You have to drop the steering column and pull the dash. Then after locating the heater core case below windshield you have to cut out a piece with a Dremel. After replacing the heater core you have fun putting everything back together..(use plastic weld to seal the case back up).in other words don't do it yourself it is a huge pain.
Passenger side under the dash
A/C or Heater? Be more specific.
This link has detailed instructions and photos http:/www.lincolnvscadillac.com/tech/lincoln-mark-viii/Thermostat-Replacement/index.htm
e bay
Under the dash passenger side
you must remove the steering column and dash board and disconnect the a/c and heater hoses from the firewall. it might help if you remove the upper intake to provide you easier access/but the dash has to be completely removed. hope this is helpful
Passenger side behind the glove box.
Lincoln dealership parts man or go to library and get a chiltons repair manual for 69 Lincoln.
it is behind glove box and yes the dash must be pulled sorry. it is in the heater box betweenthe heater core and a/c evaporator book time is 11 hrs i know guys who complete the job in four but be prepped to replace heater core and maybe evap if signs of leaks are present and age heat box was revised because hinge pin would brake of blend flapper plastic door