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March 12, 2018

1979 Mark V AC Servo Vacuum Motor Questions

Hi Bill -

Purchased a plastic manifold from you, trying to solve hot water valve issue, long and short of it , I believe my problem is the the vacuum motor, it will not pull the little cable back far enough to let vacuum out of the manifold to the green black hose. Tested with another vacuum connected and it does what it is supposed to do. Big question how to remove vac motor (easily ??)



Hi Kenny -

If the system pulls that servo vacuum motor only with another source of vacuum, the servo may be o/k but the Climate Control Sensor may not be sending enough vacuum to the servo. What can cause this? The possibilities are......The ambient temperature is too cold and the system cannot and will not drive to the full cooling position enough to operate the water valve and recirc. door motors even if the control selector is adjusted to 65 degrees.......The ATC Sniffer Sensor above the glove box liner could be faulty or maladjusted.......or the ATC system may not be receiving enough engine vacuum because of a vacuum leak. To remove those servo assemblies along with the plastic manifold can be tricky therefore consider the above possibilities before trying to remove it as it may not be the problem.

If you have the factory shop manual the adjustment for this sniffer sensor is shown in the climate control section. They are a well known fail item. We use a hand held vacuum pump to test these control systems.



March 8, 2018

1978 With Rear "Dome Lights" Stuck On.... And Responses


I just got a Lincoln in very good condition. Recently the circular rear 'dome' lights are on and I cannot turn them off. I can turn the under dash lights off and on with the light switch but the rears stay on. Can you give me some help on these?



Hi Jim -

Did you purchase the car with these rear lights stuck on? Have you checked in the rear seating areas for separate left and right passenger on/off switches for each rear light? Is your car the smaller Continental or the full size Town Car four door sedan or coupe? Do you have the original owners manual? If you need one, we may have one available.




Bill -

Thanks for the response. It is the full size Sedan (233 inches according to the manual). It also has the 460 cu in although that is irrelevant in regard to the light problem but a fun fact! They both went off when I purchased the car about a month ago. Now only the right rear stays on (and drains the battery). I do have the original owners manual. There are separate switches that I can find.



Jim -

I assume that you have checked both of the manually operated separate switches that you have found to assure that they are both in fact switched to the off position. Your owners manual should explain the complicated courtesy light operation. If the light remains on, you will need to remove the door jamb plunger switch in the affected side and unplug the wires to see if that light then turns off. If the light goes off with that plunger switch unplugged, that switch may be faulty. If not, you can try unplugging the manual switch for that light to see if it is faulty and not turning off. If you still have no luck you will need the courtesy lights wiring diagram to understand how the system works and the possibilities that could keep the lights on. At Lincoln Land we find sometimes that previous owners have somehow made wiring changes which have caused unintended consequences. The courtesy light wiring for the late seventies Lincolns and beyond can be somewhat complicated. That is why a wiring diagram is necessary for correct and easier diagnosis.


Considering Becoming A Classic Car Owner....

Hello Bill -

Thank for a very good site. I am a Norwegian man who has a DREAM of owning an american classic full size car. I am considering Lincoln, since it seems to be nice and luxurious car.

I have a few questions if you have the time to give me some tips.

1) What should I be looking for / be aware of before buying? any typical issues I should know about?

2) How is Lincoln compared to for instance Cadillac or Buick's and Pontiac's from the same time period (late 60' to late 70' ) ? By this I mean quality, problem wise, or any other good tips.

3) If you were to choose, Mark III, IV or V...and why?

4) Fuel consumption between the Mark III, IV and V? I live in Norway, and the prices on fuel are VERY high... I am also no skilled mechanic, but I have done some work on Japanese and European cars when younger.

Yours sincerely

Stig from Norway :-)


Greetings Stig -

Welcome to the old car lovers hobby and the desire to own one for your own pleasure.

The era of luxury vehicle that you are interested in has produced some wonderful collectible cars. Choosing one is a very personal decision and can be a difficult task. Collectible vehicles from all years and manufactures each have their own issues and disappointments for their owners to contend with. A well maintained Cadillac, Imperial or Lincoln is a joy to own but will cost money to maintain now and in the future. Older classic car parts are becoming harder to find and can be costly. There is definitely no way to choose a collectible car without some problems and disappointments down the road. The above is just the nature of this great hobby. The joy of ownership, the challenges and the wonderful new friends that you will meet can however outweigh the possible maintenance issues that you will encounter.

The best advice for you could be to make a list of your favorite desirable cars and visit the many forums and clubs on the internet. There are many clubs and forums on line for you to read up on and gather information pertaining to the vehicles that you desire.

At Lincoln Land, we stock hundreds of body and mechanical parts from the Nineteen Fifties and well in to the present century. We also have access to new recently manufactured parts for older Lincolns. We also acquire and sell many beautiful and well maintained examples of all years of Lincolns. We are very proud to have gathered a large following of very happy and satisfied customers as the owner here is a long time and dedicated Lincoln aficionado. Please let us know if we can help you locate the car of your dreams.



March 6, 2018

1979 Town Coupe 400 Engine Questions

Hi Bill!

My name is Justin Lindberg. I own a beautiful 79 Town Coupe with 35K miles on it. I just cannot get it to run the way it should. When the engine is relatively cold (after warming up a 2-3 min) - the car drives wonderful. Accelerates nice and smooth, and shifts gears beautifully. There is no hesitation or anything to complain about. However - once the engine warms up (after a few minutes tops) - it becomes a different experience. It idles ok (could be a little better) but mainly - it does not accelerate with the same confidence as it does when "cold." It also hesitates and does not accelerate smoothly. It shifts harder into 2nd and 3rd. Not nice and smooth like it does "cold." I know that vacuum leaks can be an issue. But, this particular vehicle was purchased from the original owner and you can tell that the hoses are still all in the right places. Also - yes I know that the hoses are 40 years old but they truly look brand new. No cracks or anything in them, even when bent or twisted to check. So, maybe there is a leak someplace but I wouldn't suspect it yet. The fuel pump is new, and I had a guy clean up the carb and the accelerator pump was replaced. fuel coming out of the pump is clean. Fuel filter replaced and rubber fuel lines. What I want to know is - is this normal for the car to run more sluggish when warmed up? Maybe due to all of the emission control stuff and the small cam? I am thinking of replacing the cam/upgrading to new manifold and 4bbl carb. But I really don't want to do that. I would say maybe it is ignition related if the car ran bad when cold as well, but it doesn't. I have a suspicion that it is the carb not acting right. It is the stock autolite. My thoughts are replacing the autolite with a new 2bbl and keeping everything else stock. Or, going all out and doing the cam, manifold, and upgrade to 4bbl. But again, I don't really want to do that. Maybe you can recommend someone near Chicago that knows these old 400 engines on a 79?

Thanks for reading!



Hello Justin -

It is not normal for an engine to become sluggish as it warms to operating temperature. Not being there to see what you are experiencing I can however offer the following.

Ensure that the engine is actually reaching operating temperature by checking the thermostat. Make sure that all of the tune up items are in good shape. This will include ignition timing, carburetor adjustments, spark plugs, high tension wiring, distributor cap etc. The vacuum advance and choke operation should also be tested for correct operation. All of the above along with their adjustments are explained in the factory Shop Manuals. Any failures or combination of failures of the above can cause poor hot engine performance therefore they should be addressed first.

In my opinion upgrading to performance equipment is not a good choice as it most likely will produce no difference as these engines performed perfectly with their original factory installed parts. Checking the original parts to expose problems is the best way to go. Good luck on an easy repair.