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| Heater fan blows constantly on high https://slantsix.org/forum/viewtopic.php?t=41379 |
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| Author: | Oldspowered [ Mon Aug 09, 2010 7:09 pm ] |
| Post subject: | Heater fan blows constantly on high |
Just wanted to share that I fixed this little gremlin problem. Whoever worked on my car before apparently swapped out the blower motor. There were two choices for the power wire that he hooked up, and he chose the wrong one. There are two similar connectors on the passenger side firewall that the blower motor will power wire will plug into. If he had paid attention he would have noticed that the blower wire is green. He had plugged it into some blue wire (paired with a round connector tan wire) that I have no idea what it goes to. I saw an unused green square connector sitting in the firewall wiring loom and lo it plugged into the blower motor. Now I have three fan speeds instead of just W.F.O. For some reason whatever power wire the blower had been plugged into supplied key-on power, so I guess the previous owner just lived with it. Now to figure out why it keeps popping the #4 20-amp fuse. I might have fixed this problem by straightening out the blower wiring, but I popped my last 20-amp fuse today and need to buy more. |
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| Author: | wjajr [ Tue Aug 10, 2010 7:05 pm ] |
| Post subject: | |
[quote]Now to figure out why it keeps popping the #4 20-amp fuse.[/quote] Probably it started blowing fuses during cold weather, and PO just rigged it up to get by. According to my 67 FSM, a black with tracer #14 wire runs from fuse block to heater fan switch. From heater fan switch, two wires: # 16 brown; & #16 dark green, go to the “Heater Blower Motor Resistorâ€. This is the gizmo that steps down 12V to two lower voltages to slow the blower motor down giving three speeds. I’m betting that between the fuse block & resistor, and resistor to motor you have an intermittent short from a chafed, or hacked wire from a stereo install gone bad. What PO did was bypass the resistor feeding the motor with a full 12 volts. Check [url=http://www.mymopar.com/index.php?pid=24] here[/url] for wiring diagrams. |
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