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I have a 69 camaro and the fan only blow's low in all positions on selector switch. I have installed a new resistor at the blower box and even installed new switches. I still have the same problem. Is there any other resistor that could be causing the problem.If any one has any ideas your help would be greatly appreciated.
 

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Lets do this:
Get a volt meter. Put the red lead of the VM into the Purple wire stake-on, on the fan relay, top of the evap case. The other VM lead put on the negative battery cable. Turn ingition on and a/c on. Put the fan switch in the low position. you should read about 4.9 or 5 volts. move the switch to the medium1 position and you should read about 5.8 or 6 volts, then put the switch in the medium 2 position and you should read about 7.2 volts or a bit more. Then put it on high, you should read 11 or so volts. If all your readings come close to mine then you need to look at the blower. Because what we just did was check the switch, the relay and the fan resistor. If all those voltages changed in higher increments on that purple lead then the system is working up until the motor. Check ground as well. To bench test the blower with a full 12 volts just run a lead from the pos of the bat to the purple stake-on, on the relay. If the motor runs a lot louder than before then you know its good.
LMK what happens.
 

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Theres a slide switch on the lower left corner of the HVAC control panel called a lo-blo switch. That switch's contacts gets burned over time and causes the fan to only run on the minimum speed setting. Pull the switch out and clean it up and you should be fine.
 

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Theres a slide switch on the lower left corner of the HVAC control panel called a lo-blo switch. That switch's contacts gets burned over time and causes the fan to only run on the minimum speed setting. Pull the switch out and clean it up and you should be fine.
If only only IF you are lucky! If the problem is the switch, it's probably new switch time.
 
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