1967 Continental Convertible Heat & Rear Window Questions

Bill –
I am currently working on a ’67 Convertible and am having trouble diagnosing why the heat isn’t working properly. My shop manual also doesn’t explain troubleshooting as well as it most likely should. Is this typically a thermostat problem?
Question # 2
The rear, driver side, window is currently in the down position and I can’t get it up again. I am not sure if this is a switch problem, or if the motor is bad, … Because they are automatic drop-down windows (for the convertible top) I figured this issue is more of a “can of worms” and I should seek professional help.. Thoughts???
Sincerely,
Thomas
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Thomas –
Your heating issue can certainly be a simple engine thermostat problem or a heater core problem, but on a sophisticated Lincoln system there is nothing that is typical. Therefore proper diagnosis is usually necessary as you are suggesting. Diagnostic charts are shown in the factory shop manuals but there are three systems. For us to direct you to the correct page for your system we will need to know if your Lincoln is equipped with a Heater only system, a Manual ac/heat system or an Automatic Temperature Control system.
The rear window circuits in the 67 convertible can be complicated and not for the timid. George wanted me to ask you if you have the special Convertible Rear Power Window diagnostic guide on hand? If you can give us the information regarding the above two questions as well as tell us what Does work properly on your heater or a/c system we will be able to proceed to help you much further.
Sincerely,
Bill
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Bill,
I am extremely sorry about the late response. Thank you so much for your last email. Since that, I have replaced the thermostat and flush the heater core. System seemed to be pretty clean… I am now wondering could it be the heater check valve? .. The fan works wonderfully! And this car is equipped only with a heating system. I checked all the hoses and they seem to be in good shape too…
Thomas
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Hi Thomas –
Yes, the heater water valve at the rear of the engine can be a problem if it is defective and seized shut or if it is not receiving vacuum from the controls. Another unit under the hood that needs vacuum to provide heater operation is the vacuum motor for the Blend Door. It operates on varied vacuum from the temperature control selector. The correct Lincoln shop manual has a section that explains the various operations and even offers a diagnosis guide. That section in the 1967 Lincoln service manual starts on page 16-1. Do you have that shop manual?
Bill