heater blower stopped working 00 civic how to test
is there a way i can test the blower from the relay under hood. like jump the wires somehow. I suck at electrical stuff. the blower quit working after a rainy day. I think water got in somewhere
when i turn the blower all the way up I hear a relay click under the dash but nothing happens. Im gonna need heat in the winter might as well figure it out now
when i turn the blower all the way up I hear a relay click under the dash but nothing happens. Im gonna need heat in the winter might as well figure it out now
The blower motor themselves usually dont go bad, what usually goes bad is the blower resistor. I would unplug the blower connector, should be a 2 pin one(sorry I don't have a wiring diagram in front of me) and check for voltage when you turn on the blower.
Do you have a DVOM?
Do you know how to test for voltage?
PS: you may want to update your pics on you FS thread.
Do you have a DVOM?
Do you know how to test for voltage?
PS: you may want to update your pics on you FS thread.
yeah I got a voltage thing....multimeter.
and yeah I know how to test for voltage. it happened right after a rainy day so I think something got jacked I checked all the fuses and moved around the relays. the heater blower uses a different relay I think Ill have to throw a spare one on there just to eliminate those being bad.
that forsale thread is so old Im too lazy to remove it. that car has since been sold and stolen and recovered I believe
and yeah I know how to test for voltage. it happened right after a rainy day so I think something got jacked I checked all the fuses and moved around the relays. the heater blower uses a different relay I think Ill have to throw a spare one on there just to eliminate those being bad.
that forsale thread is so old Im too lazy to remove it. that car has since been sold and stolen and recovered I believe
Dont waste the time looking for relays and all that before you properly check voltage at the motor. If you have voltage it's a bad motor, if you don't then you then look deeper.
1. Your car has two separate relays related to the blower motor controls; a blower motor relay in the under-hood fuse/relay box, and a blower motor high relay located right under the blower motor.
2. As the blower motor should already receive power (+) with the ignition on, it just needs the ground source (-) for the blower motor to run. On the power side, check that under-dash Fuse No. 17 (7.5A) and under-hood Fuse No. 55 (40A) are good.
The ground source (-) is controlled by the heater control panel:
-for lower speeds, ground comes through the blower motor power transistor.
-for the higher speed, ground comes through the blower motor high relay.
3. As long as there is power going to the motor, you can easily test whether the blower motor is good by using a jumper wire on either the harness connector for the power transistor or blower motor high relay to supply ground directly to the motor.
a. Locate the blower power transistor on the blower motor assembly.
b. Unplug the electrical connector to the transistor unit.
c. Attach a jumper wire (short piece of wire) from the Blue/Black wire cavity (terminal no. 1) to the Black wire cavity (terminal no. 3) on the unplugged electrical connector. Leave the connector unplugged.
d. Turn the ignition ON. The blower motor should run.
Alternative test:
a. Locate the high relay under the blower motor assembly.
b. Unplug the electrical connector to the high relay.
c. Attach a jumper wire (short piece of wire) from the Blue/Black wire cavity (terminal no. 1) to the Black wire cavity (terminal no. 3) on the unplugged electrical connector. Leave the connector unplugged.
d. Turn the ignition ON. The blower motor should run.
2. As the blower motor should already receive power (+) with the ignition on, it just needs the ground source (-) for the blower motor to run. On the power side, check that under-dash Fuse No. 17 (7.5A) and under-hood Fuse No. 55 (40A) are good.
The ground source (-) is controlled by the heater control panel:
-for lower speeds, ground comes through the blower motor power transistor.
-for the higher speed, ground comes through the blower motor high relay.
3. As long as there is power going to the motor, you can easily test whether the blower motor is good by using a jumper wire on either the harness connector for the power transistor or blower motor high relay to supply ground directly to the motor.
a. Locate the blower power transistor on the blower motor assembly.
b. Unplug the electrical connector to the transistor unit.
c. Attach a jumper wire (short piece of wire) from the Blue/Black wire cavity (terminal no. 1) to the Black wire cavity (terminal no. 3) on the unplugged electrical connector. Leave the connector unplugged.
d. Turn the ignition ON. The blower motor should run.
Alternative test:
a. Locate the high relay under the blower motor assembly.
b. Unplug the electrical connector to the high relay.
c. Attach a jumper wire (short piece of wire) from the Blue/Black wire cavity (terminal no. 1) to the Black wire cavity (terminal no. 3) on the unplugged electrical connector. Leave the connector unplugged.
d. Turn the ignition ON. The blower motor should run.
The blower motor need both power/voltage (+) and ground (-). If there is voltage going to the motor and it doesn't run, it does not necessarily mean the motor is bad. Ground also needs to be applied to the motor.
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Correct!
If it's a 2pin connector, you should have voltage and ground present. If you check with a DVOM, at the two pins, and it shows battery voltage, then it's only obvious that you have both. We said the same thing, you were just more detailed.
Ok I unplugged the high relay under the blower assembly and jumped the thick blue/black wires and black wire and nothing happened. I then put voltage 12 volts to the other 2 wires and still nothing happened. When I attached power I heard the relay click underhood. both fuses were good the 40 and 7.5 I jumped them just incase and still nothing.
1. Was the ignition turned on when you jumped the blue/black wire and black wire at the harness connector for the high relay?
2. What other two wires are you referring to when you applied 12 volt?
3. Try to jump the blue/black wire and black wire at the connector for the power transistor, with the ignition on to see if it still doesn't run.
2. What other two wires are you referring to when you applied 12 volt?
3. Try to jump the blue/black wire and black wire at the connector for the power transistor, with the ignition on to see if it still doesn't run.
Last edited by tech8; Sep 9, 2014 at 08:21 PM.
I checked the blower and its dead I took it out and hooked power ground and it doesn't spin guess the blower was just bad. Gonna try a new one soon
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