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Post by bordin34/Dan on Oct 15, 2007 18:31:45 GMT -5
The fan on my 1973 Charger is not working. When I moved the heat switch from heat to defrost or from setting to setting I can hear the ducts opening and closing. I think either the fan switch does work or the fan motor is broken. Is there an easy way to test this?
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Deleted
Deleted Member
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Post by Deleted on Oct 15, 2007 18:55:24 GMT -5
buy a cheap test light and check for power to the blower motor. owning one is a must for basic electrical troubleshooting. If no power there, you will need to backtrack the circuit. While its possible that might have a bad resistor block or blower motor, its more likely that you have a bad switch. I`m willing to bet that Nacho will be glad to post up a diagram of the circuit.
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Post by Nacho-RT74 on Oct 16, 2007 0:08:50 GMT -5
just heater equipped or A/C-heater ?
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Post by bordin34/Dan on Oct 16, 2007 14:00:58 GMT -5
a/c and heater
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Post by Nacho-RT74 on Oct 20, 2007 16:42:08 GMT -5
first check for working motor. feed directly from batt. Then will go to next step
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Post by Nacho-RT74 on Oct 21, 2007 11:17:53 GMT -5
www.dodgecharger.com/forum/index.php?action=dlattach;topic=34949.0;id=55636;image73/74 is diff about the lever fan switch plug, but wires route are the same and same color Some Notes: A/C cars are LOW SPEED turn on by default. I mean even if you unplug the lever fan switch, blower will be still working on low speed since TURN ON CONTROL switch sends power directly to resistor, spliced from fan lever plug itself. SO you can check if TAN wire on resistor plugs is getting power when you turn on the A/C control. This wire is ALLWAYS powered ( is the low speed ). If you don't have power there, then Control switch is damaged or allmost gone. Sometimes they endind having an inner "play". Heater uses another wire to feed blower... brown wire. That sets up a JUST ONE SPEED to heater function. Light green on resistor and lever switch is mid speed. Dark green wire on fan plug is a direct to blower source. Doesn't run to resistor. Same green wire is also spliced on bulkhead because same green wire comes from resistor but just as a resistor low, mid and heater speeds output. P.S.: is a 71 diagram, so blower and clucth wires arrived to bulkhead on tranny harness area. since 72 those wires could or not arrive to bulhead and use a grommet on firewall instead, because one more wires were added to electrical system, groun NSS to setabelts function... so depending on equipment options. Tipically, on non tach cars, blower wire still arrived to same cavity used on 71 and clutch wire then use the only cavity empty on engine harness
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