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The purpose of the National DeSoto Club, Inc. (NDC), is to encourage the preservation, restoration and promotion of all De Soto automobiles, as well as to promote fellowship and the exchange of knowledge among all fellow members. Furthermore, the study, compilation of data, summary of information, and preservation of literature related to De Soto automobiles is encouraged. The NDC’s message board is open to all. The NDC’s Trustees and members are NOT responsible for the accuracy of any of the information posted to this message board. The NDC’s web-master may, at his/her discretion, remove any message that is deemed to be offensive, and deny posting privileges to the person who posted the offensive message.
 
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AlexvanderWal
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 Posted: Mon Aug 30, 2010 5:53 pm |
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Joined: Sun Aug 29, 2010 8:11 pm
Posts: 35
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The heater unit under my dash shows two knobs (49 deluxe), one air flow and one defroster. The air flow is working. The defroster not. Can anyone tell where this defroster knob is for and how it works?
Thanks
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PaulMurkowicz
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Posted: Wed Sep 01, 2010 1:28 am |
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Joined: Tue Aug 10, 2010 10:57 am
Posts: 393
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I would think that the other control goes to a water valve. You may be able to trace the cable to the valve.
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McArthurGeorge
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Posted: Wed Sep 01, 2010 5:30 am |
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Joined: Fri Aug 13, 2010 1:44 am
Posts: 216
Location: Laurens, SC
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On the heater controls shown below, the knob on the left controls the speed of the heater motor and the knob on the right controls the speed of the defroster motor.
Mac
| Attachments: |
49 DeSoto Heater Controls (Small).jpg [ 78.78 KiB | Viewed 1910 times ]
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AlexvanderWal
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Posted: Wed Sep 01, 2010 9:11 pm |
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Joined: Sun Aug 29, 2010 8:11 pm
Posts: 35
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OK, but this defroster motor? Where is it situated, and what does it do? Where do I have to use it for?
If I turn this one on, do I have to hear something or not?
Thanks.
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McArthurGeorge
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Posted: Thu Sep 02, 2010 2:13 am |
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Joined: Fri Aug 13, 2010 1:44 am
Posts: 216
Location: Laurens, SC
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The heater and defroster blower motors on a 1949 DeSoto are located within the heater/ductwork unit under the hood on the passenger side as shown below. If the defroster is working properly, it should be blowing air out onto the inside of your windshield from the base of the windshield when on. This would be used to keep condensation from forming on the inside of the windshield and to help melt frost or snow on the outside. At high fan speed, you would probably hear the fan running.
Mac
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49 DeSoto Heater & Housing.jpg [ 46.1 KiB | Viewed 1881 times ]
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