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1977 Mark V AC Questions & Update

Hi,

I am currently having a problem with my AC on my 1977 Lincoln Continental Mark V. It only blows hot air. There is an HVAC located under the dash that is not connected to anything. However, when I suck on the HVAC the AC begins to work correctly and blow cold air. I can't find where to connect the HVAC to. Any ideas? I could send a picture if that would be of any help.

Sam

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Greetings Sam -

Yes, please send a "clear" photo and I may be able to identify the part that is disconnected. Sometimes certain vacuum lines are pulled off from a certain servo by owners or technicians in order to overcome the lack of needed heat in the car that is due to a another component that has failed. Your description is not uncommon for a part that is well known to fail. If I identify the part it will be up to you to find and reconnect the vacuum hose to the servo. Skills here would be very helpful and you may need the vacuum schematic for this. You will probably also need to replace the failed part that I mentioned above. It is a popular fail item that we usually have in stock. Be prepared to purchase this part from us and become another satisfied Lincoln Land customer. We will wait for your photo to arrive and then proceed to the next step.

Sincerely,

Bill

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View image

Here you are Sir, here is the photo you asked for

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Hi Sam -

Your photo is clearly showing a disconnected vacuum hose. Is that what you are referring to as a disconnected Hvac? If I understand you correctly you are saying that if you apply vacuum to this hose, the Heating Ventilating Air Conditioning (HVAC) system starts to operate on a/c. If that is true, you will need to find the disconnect under the dash and connect it properly. This I cannot do from here. Your photo also seems to reveal other wiring or vacuum hoses that may be in a state of disarray under the dash. Wiring and vacuum schematics/diagrams may be required in order to correct this and any other parts that are disconnected or misconnected.

Sincerely,

Bill