what are the ways I can start troubleshooting how to get my heater motor working again? We bought this 65 mustang and it doesnt have a heater core in and the heater hoses just bypass it, but we want to reinstall it. The motor and box is all there but the heater core isnt. So where do I start checking to see where the problem is?
heater motor not working.
- Thread starter DarkoStoj
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Does the heater control switch work? its a switch above all the heater control levers, if that doesn't work, replace that, if it works, and there is voltage coming through then the heater motor has to be replaced.
Here is a wiring diagram for you, it has the wires color coded for you
http://midlife66.com/wiring/66acces1.jpg
Here is a wiring diagram for you, it has the wires color coded for you
http://midlife66.com/wiring/66acces1.jpg
Tim65GT
Active Member
NICE! I should be able to figure it out with that.Here is a simplified diagram of the blower circuit.
The motor gets 12v from the fuse box and the switch regulates the ground potential through a resistor assembly.
so there is a fuse that runs to the blower right? I guess that will be the first place i check.
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the current from the fuse block runs to the motor. Its the source, its in the engine bay, there are two wires that go to the motor, check the current on the brown one. But when i wired mine, i remember that the wires had become black and hard with dirt and buildup so check both wires i guess.
If no current is being received there, then check the fuse box for a fuse. I'm not sure if the heater has its own fuse, i doubt it, its probably on the accessory fuse
If there is current. then make sure that there is a wire plugged into the heater box prongs, theres a set of three and one below. The one on the bottom is supposed to receive current from the back of the heater motor. So check if the wire is still in tact using an ohm meter.
Im not 100% sure how to test the switch itself.
If no current is being received there, then check the fuse box for a fuse. I'm not sure if the heater has its own fuse, i doubt it, its probably on the accessory fuse
If there is current. then make sure that there is a wire plugged into the heater box prongs, theres a set of three and one below. The one on the bottom is supposed to receive current from the back of the heater motor. So check if the wire is still in tact using an ohm meter.
Im not 100% sure how to test the switch itself.
OK funny I just did this myself. I guess winter is here and we all would like some heat.
Step 1. Hook the 2 wires coming out of the fan and connect them to the battery. Doesn't matter which one goes where, we,re just seeing if it spins.
Step 2. If that works reconnect them. Turn the ignition on. Take the wire, should be yellow, off of the resister on the heater box and ground it. The fan should also spin.
Step 3. If all that worked, unconnect the wires coming from the heater switch and connected to the resister. Take the same yellow wire and connect it to one of the 3 wires coming from the switch. By doing this you are bypassing the resister. Try to turn on the fan by switching to low, medium, or high on the heater switch. One should turn on the fan.
Step 4. If all that worked, replace the resister. That's what I needed to do.
Good Luck.
Step 1. Hook the 2 wires coming out of the fan and connect them to the battery. Doesn't matter which one goes where, we,re just seeing if it spins.
Step 2. If that works reconnect them. Turn the ignition on. Take the wire, should be yellow, off of the resister on the heater box and ground it. The fan should also spin.
Step 3. If all that worked, unconnect the wires coming from the heater switch and connected to the resister. Take the same yellow wire and connect it to one of the 3 wires coming from the switch. By doing this you are bypassing the resister. Try to turn on the fan by switching to low, medium, or high on the heater switch. One should turn on the fan.
Step 4. If all that worked, replace the resister. That's what I needed to do.
Good Luck.
its been way too bitter cold to even mess with it right now. I'm going to start on it as soon as we get a warmer day here.
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