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 |
Mikey914 |
Jan 28 2021, 08:12 PM
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#55
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The rubber man Group: Members Posts: 12,711 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
Bosch has motors listed for these. If you have removed the unit this far you can save a few $ and get the Bosch brand. I have seen them for al little as $65 at one point.
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Superhawk996 |
Jan 28 2021, 08:41 PM
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#56
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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 |
Bosch has motors listed for these. If you have removed the unit this far you can save a few $ and get the Bosch brand. I have seen them for al little as $65 at one point. @Mikey914 Would be curious to see what you're thinking of. Do you have a part number? I'll do a little digging too. I'm only aware of the URO part. However, I think it really does look like what maybe a off the shelf motor with some sort of molded adapter to fit this 914 blower housing frame that this smaller motor frame was a part of. |
DRPHIL914 |
Jan 28 2021, 09:59 PM
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#57
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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 |
Bosch has motors listed for these. If you have removed the unit this far you can save a few $ and get the Bosch brand. I have seen them for al little as $65 at one point. @Mikey914 Would be curious to see what you're thinking of. Do you have a part number? I'll do a little digging too. I'm only aware of the URO part. However, I think it really does look like what maybe a off the shelf motor with some sort of molded adapter to fit this 914 blower housing frame that this smaller motor frame was a part of. @Superhawk996 good work! the Bosch motor i have found on ebay, multiple sellers, about $75-85, and Bosch does the fan/motor assembly for about $250, so a few options depending on your time and $$ available. i am going to get a URO assembly for one of these, i have one good motor/fan/resistor from Al , that one will get reassembled once cleaned and new seals all come from Mark and we will document the whole rebuild and assemble, retest and reinstall. that will wait for a week as i will be gone this weekend and parts are not in yet. |
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