| htboyle | -- 11-04-2024 @ 7:33 AM |
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My heater in my 1949 Mercury will not run on high, only on low. Is it the switch or heater motor and how do I tell? Help.
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| TomO | -- 11-04-2024 @ 9:24 AM |
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Check the voltage going to the motor. On high speed it should be 6volts with a fully charged battery or with the engine running at around 1,200 rpm. If it is less than 6 volts, the switch is the problem. Does the motor run at the slow speed when you have the switch on high? Does the motor stop when you move the switch to high? Tom
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| htboyle | -- 11-04-2024 @ 4:55 PM |
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No. If you move the switch to high the motor stops.
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| TomO | -- 11-06-2024 @ 11:46 AM |
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It sounds to me that the motor is good as it runs on low speed. The switch reduces the motor speed by using a resister to drop the voltage. If you are very careful, you may be able to open the switch and clean the contacts. I have not opened the 1949 Ford and Mercury heater switch, but have been successful in cleaning other pull out switches. The main concern is not to have the parts pop out of the switch body before you see how they fit in there. Tom
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| htboyle | -- 11-07-2024 @ 9:28 AM |
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Thanks Tom. I’ll give it a try. Carefully! Howard
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| htboyle | -- 11-07-2024 @ 4:32 PM |
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Ok, I took the switch apart and cleaned it. I put it back in and the first stop as I pull the switch out is now moving air much better. That is the high position. As I pull it to the low position it stops as it did before. II think the problem is with the resistor on the switch is bad. I found one on eBay. It will be here next week. Hopefully that does it. Thanks for your help. Howard
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