Wednesday, September 14, 2011

1964 to '67 GM Plastic Heater Control Parts


Maintaining 1964 to ’67 GM plastic heater control parts

Story Jim McGowan

For some reason, the designers at GM decided to use some plastic parts for the dash control levers in many 1964-’67 A-body cars.

The levers at the heater box were metal and durable over the years, but the levers at the assembly, controlling the opening and closing of the defroster baffles and temperature control, were plastic. They probably never dreamed that cars from that era would still be around almost a half-century later. So at the time, plastic was a cheap alternative. They were wrong and we’re in trouble.

Last winter, I was driving my ’65 GTO and wanted some heat. I moved the control lever in the dash and felt the normal resistance, and then bang, the lever went completely to the other side of the control panel without any resistance whatsoever. I knew that something had broken in the cable-operated control assembly. I had lubricated all those controls about 10 years ago and forgot about them. Well, that was a mistake.

After crawling under the dash, I found the problem. The control cable wires have a loop on each end that slides over a plastic pin, which is part of the lever. These controls are now ancient plastic, which has dried out and is brittle with age. A control lever corner and pin had broken completely off. Had I been more pro-active lubricating these parts, this probably wouldn’t have happened. The problem is that it’s difficult to get at that these parts to lube them with the dash in the car. It will all have to come out for the damage to be repaired and the assembly properly lubed.

In this case the instrument cluster is fairly easy to remove; it’s a little more complicated with the larger, later-model clusters. I’m using Justice Brothers JB-80 on all the moving metal controls and their aerosol White Lithium Grease on the plastic controls. You can also squirt the JB-80 inside the cable covers to help the cables move more freely as well.

From now on, I think I’ll repeat this exercise every four or five years to be safe. Since these controls don’t get much use, old grease and other lubes can actually dry out and cause harder cable activation. So regularly lube them or lose them.

1 The heater/defroster controls are located at the right side of the dash cluster. Two slide levers that push or pull the heater box control assemblies activate them. The ’64-’67 A-body controls are all similar to these.

2 In order to easily access the controls for one of the baffle doors on top of the heater box, remove the glove box insert. It only takes couple of minutes and gives you a direct shot at the assembly.

3 Here’s the dual slide lever assembly behind the glove box. This one is all metal, and can easily be thoroughly lubed with aerosol white grease. Note the wire loop over the metal pin on the lever. A tab with small screw holds the cable in place on the box. Remove the screw and pull the loop free of the pin. Apply a good dose of grease under each moving part and work it in by hand.

4 Remove the screws holding the dash cluster and unscrew the speedo cable. Then pull the assembly forward and pop out the light bulbs, unplug any switches and remove the two other cables attached to the box on the driver’s side. A towel will protect the steering column from scratches.

5 This is the cluster with the three heater control cables visible. Label the cables before removing them so you know which goes where.

6 Here are the two aging plastic lever assemblies. Notice the lower corner of the right assembly. I initially used Superglue to reattach the broken corner and then applied a layer of JB Weld all around the area where it cracked. A healthy dose of Justice Brothers White Lithium Grease was added at all the pivot points of the plastic and metal levers.


  1. Hi, My name is Brian and I'd like to speak with you about your blog, please email me at your earliest convenience.

  2. Ech Léift all d'posts, ech wierklech ass, géif ech méi Informatiounen iwwer dat wëll, well dat ganz flott ass.

    Merci fir alleguerten.

  3. Thị trường bất động sản đầu năm 2017 với sự xuất hiện của dự án eco dream nguyễn xiển. Chung cư eco dream là dự án căn hộ cao cấp với mức giá hợp lý, chung cu eco dream là cơ hội đầu tư sinh lời cho nhà đầu tư. Ngoài ra, chung cư Housinco grand tower cũng là dự án nổi bật với hơn 200 căn hộ đạt chuẩn 5 sao. Chung cư Vinhomes gallery là siêu dự án trung tâm quận Ba Đình, chung cư Vinata Towers là dự án đầu tiên được đầu tư bởi Nhật Bản. Chung cư eco green city chỉ còn hơn 100 căn hộ cuối cùng. Chung cư The legend sở hữu vị trí trung tâm quận Thanh xuân. Chung cư Tháp doanh nhân vị trí đắc địa quận Hà đông.

  4. I found a lot of interesting information here. A really good post, very thankful and hopeful that you will write many more posts like this one.
    usps tracking

  5. I just want to tell you that I’m all new to blogging and site-building. I really loved your web page. Very likely I’m want to bookmark your site . You amazingly have remarkable posts. Thanks a bunch for sharing your blog.
    Regards -

  6. The last thing you need is to buy a Michael Kors Handbags Clearance that you will hate within a few days or even months. A good quality Michael Kors Outlet Store is something that you can own and love for years. The first thing you should do is to determine what you want in a Michael Kors Handbags On Sale. List the features you are looking for so that you can narrow your choices. Are you looking for a Michael Kors Bags On Sale for special occasions or one that you will carry to the office? Designer Michael Kors Factory Outlet come in many styles and sizes, and you can get exactly what you need for any occasion. A budget will help you to know your limit as you look through different Michael Kors Bags Outlet. When you decide right off the bat what you can afford to spend, you will not waste time looking at Michael Kors Outlet Online that you cannot afford. The best way to make sure that you get a good quality Michael Kors Handbags Outlet is by sticking to well-known brands. You might spend more for these brands, but you will end up with a Michael Kors Outlet Online that you will love for years.It is a good idea to look for Michael Kors Bags Outlet in classic styles.

  7. Michael Kors Handbags On Sale,
    You can find Michael Kors handbags in many department stores around the country.
    Michael Kors Purses Outlet,
    They are being seen all over the place.
    Michael Kors Bags On Sale,
    There are so many fabulous handbags to fall in love with.
    MK Handbags,
    To find these amazing handbags you can also shop online for all your Michael Kors products.

  8. Well! you can have brother printer problems due to the several reasons. check out this article and follow the instructions to fix the problem.
    how to fix brother printer says offline problem?

  9. Anyone who reads this post will find it great, me too, I will continue to follow your posts. It's great, wish you success in the next blog, this is a post that we all should read at least once.
    free friv Games 2019, jogos io online, abcya free, cá koi mini

  10. Classic Industries offers a wide selection of 1964 Chevrolet Truck parts, including 1964 Chevrolet Truck

    apk here

  11. It’s difficult to get knowledgeable folks on this topic, but the truth is be understood as what happens you’re preaching about! Thanks. See Instagram photos and videos from 'Gramho' hashtag.