Defrost fan rehab and rebuild thread (fresh air fan), or How the heck do if fix this thing? |
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Defrost fan rehab and rebuild thread (fresh air fan), or How the heck do if fix this thing? |
DRPHIL914 |
Jan 21 2021, 08:55 AM
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#54
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Dr. Phil Group: Members Posts: 5,808 Joined: 9-December 09 From: Bluffton, SC Member No.: 11,106 Region Association: South East States |
I have been dealing with this for 12 years, a non-running defrost fan. i even pulled this out 2 years ago and rebuilt it with new flapper seals and main body seal then made sure fan turned but didnt bench test the motor or resisitors, so as a result it still does not work properly. i will be documenting this because 914rubber and Mark will soon be putting together a kit for this that includes all the hardware seals and even a motor i believe, BUT i still have problems and questions!!! so i am starting this thread to get information on diagnosing the common causes of it not working and how to fix it, and then document the rebuild and replacement of the motor, fan, resistor and maybe the control unit in dash. Others have documented the reinstallation of the fan and the cables so i will not duplicate that. and we may want to link other threads hear that have done that as well.
Mark is sending me a kit soon, so while i wait for it, i will have to get some more information about the wiring and resistors function and how to test them . I had this out last week and tested 3 different control units due to thinking that my issue was a control issue, because it runs on one speed, #2, and anything else does not work and it will then throw the fuse. most assume this would be caused by bad slider unit but i tested 3 of them and 2 are like new with no wear on the sliders , still same result. so i am suspecting the resistors /plug aparatus . If anyone has done this and cares to share how to examine and test that for proper function, lets start there. Resistor function, which lead is which and examination of the control units I will take pictures of mine tonight and post those soon. once this figured out and fixed i will do a full step bystep on reassembly too. Looking for lots of help and input on this, thanks!!! Dr. Phil |
Superhawk996 |
Jan 28 2021, 08:09 AM
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#55
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914 Guru Group: Members Posts: 6,469 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
Warning: Carnage that can ensue trying to disassemble the blower motor
First up someone was clearly here before and made some creative rubber seals for the blower motor control vanes. Looking forward to purchasing 914Rubber foam seals. Should you decide to remove the impeller the 1st step is to get the spring clip off. I did it by gently prying the clip upward until I could get ahold of it with expanding snap ring pliers. In the cascading events that lead me to remove the motor from the housing / frame, it lead to a complete FUBAR situation. The permanent magnets and a bunch of spring clips that hold the magnets inside the housing came out along with the motor frame. I had assumed the permanent magnets would be secured to the housing. They were. However the glue that was holding them was so old, they just slipped right out of the frame along with the rest of the armature frame assembly. I don't see this ever going together properly again! Given the result, I would not recommend trying to remove the motor from the housing unless you're planning to replace the complete motor assembly. Brushes weren't designed to be serviced, though it could be done if need be by unsoldering them, and carefully bending the retainers to get the brushes out. But, truly not designed for service. (IMG:style_emoticons/default/blink.gif) The other is the motor shaft bushings are not designed for service. If they are worn and allowing side play and vibration like mine was, I don't really seee a viable way to service them even with the entire motor frame readily in my hand. (IMG:style_emoticons/default/sad.gif) |
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