" /> Bill's Corner: April 2018 Archives

« March 2018 | Main

April 9, 2018

1978 Continental "Buzzing" Under Dash

Bill,

I get a fairly loud intermittent "buzzing" noise coming from underneath the dash after the vehicle has been sitting in the sun for a while, it also occurs when I first start the car up, even in the garage, but only lasts for a very short period of time.

Regards,

Bruce

----------------------------------------------------------------------------------------------------------------

Greetings Bruce -

Not being there to hear that noise it is difficult to point a finger at the cause. Someone needs to step out of the car when the noise is sounding to make sure that is actually coming from under the dash. There are so many tones to imagine but I can suggest that you check the transmission fluid level as some C6 transmissions will buzz in neutral with the engine running if they are low on ATF. The transmission fluid must checked with the engine running.

Sincerely,

Bill

In The Market For A Mark III....

Hello Bill -

I am looking at buying a 69-71 Mark III and am wondering if you might suggest which, in your opinion is the best year for this car. I owned a 63 continental convertible years ago and loved that car and know all its quirks. Are earlier models better without any emissions equipment? Are climate control systems about the same in each? Thank you, so glad to find your website.

Bret

----------------------------------------------------------------------------------------------------------------

Hi Bret -

There are differences in the 69-71 Mark IIIs, but with any car from this bygone era, condition and odometer reading should be a strong factor as well. The 69's have the much nicer unique heavier wheel covers and the a/c outlets are of a higher quality eye appealing design and material. The 69 was the last year for the sometimes troublesome crankshaft driven power steering pump as opposed to the corporate belt driven units. The a/c was mostly the same on all three years but a/c was optional on the 69's. Most owners ordered the Automatic Climate Control option that proved to be a great operating unit. Most of these a/c units do require maintenance and repair occasionally as does the a/c on all other vehicles. As far as the emission systems go the later ones with the pump did not seem to cause many problems but some emission systems have been removed from the 70/71 Marks that we see today. Outside there are also many very small differences but easiest to see is that the 70/71 has a longer hood to accommodate the hidden windshield wiper blades. Of these three years of Marks there are definitely no bad years. They are all great Continentals. Choosing however really boils down to your own personal desires. Good luck with your search!

Sincerely,

Bill

April 3, 2018

1979 Mark Fans Speed Questions

Bill -

The fan speed control works on all speeds except when you select heat then the fan does not come on at all also air is only Luke warm on economic vent or hi love. Also mode selector is very stiff to Operate. Thank yo,u have purchased from you in the past - you guys are great! I do have the Factory Shop Manuals.

Michael

----------------------------------------------------------------------------------------------------------------

Hi Michael -

The inoperative blower in the " HEAT " mode sounds very likely to be the very popular failure of the EVR relay ("Electro Vacuum Relay").

The EVR operation is explained on page 36-74-2 of your FoMoCo factory manual. The wiring diagram is on page 36-74-5 and the location drawing is on page 36-74-9. We can usually rebuild these if they prove faulty or replace with a good used one. Have this item diagnosed and let us know what you may need.

Sincerely,

Bill

1972 Mark IV - AC Questions

Hello Bill,

I have a 72 Mark IV. The AC is acting up since I bought it. Sometimes it works great, others it goes on and off like it's reached temp, then decides it hasn't. I'm not sure where to start. It appears as thought the compressor and associated units are working properly, I suspect it's just not getting accurate input from the controller and/or any thermostats that regulate the system. What's the most common issue and where would I start?

Thanks in advance,

Michael

----------------------------------------------------------------------------------------------------------------

Greetings Michael -

The Automatic Climate Control systems of this era are very complicated and do require much patience and a very good understanding of how they operate in order to repair it yourself.

You do not provide very much information (for me to work with) as to what your Mark IV's ATC is or is not doing. If you have the correct FoMoCo factory manuals you should however begin by reading them carefully and understanding how the system operates. Next you can perform the diagnosis procedures that are shown in the Manual. Many vehicles that we service at Lincoln Land have two or more issues. Since you ask, I will list some of the common Control issues that we see and repair here at our shop. Keep in mind that the refrigeration section is of course separate from the ATC control system and could also be inoperative or weak. Be advised however that there really is no single item that is a more common fail item than the others. When you can provide more information for us we may be able to lead you much closer to the problem area or areas.

ATC Box (internally)
Range Relay
High Blower Relay
Blower Motor
Blower Motor Resistor
Main Control Switch
Sensor String
Any vacuum motor (that operate the mode doors) and the blend door
Poor wire contacts or burnt wires connections at certain circuits

If the ATC system has been tampered with or altered previously, It will need to be restored in order to diagnose properly. We have the ability to supply or service most faulty items that you prove to be faulty. If there are certain parts that you are unable to test, we can offer to test them here if you wish. Good luck to you with the testing and a speedy repair.

Sincerely,

Bill