Ae82 Air Con Fan Repair

[ToasticlesAe82]

Compressor still works, cold air still passes through the ducts but fan does not work, interested in a repair guide or link to one, for repair to the fan/wiring harness

 

Cheers.

 

rolla: 1986 Ae82 Corolla CS-X Sedan, 5 speed manual 1.6l 4a-e engine

[TRD ke70]

need some more info!!

does the fan work on the highest setting?

if so then it's what they call the thermistor screwed into the side of the fan motor housing, pull it out and you should see 3-4 coils of wiring, some of those will be burnt out. replace it as these aren't repairable!

 

If it doesn't work on the highest setting then it could be a fuse or a circuit breaker, i think they are under the left hand kick panel.

[Trev]

What Scott said, the fan speed resistor is located behind the glove box.

[basher_ke20]

had the same problem and it ended up being the actual ac controller box/ecu.

try the other stuff first but if thats no good then i would be changing that

[ToasticlesAe82]

sorry i forgot to say xD no fan does not work on any setting, i tested all the fuses when doing a muck about they're all good on the left hand kick panel,

 

as i said tho i think it needs a new fan/motor, as i still get compressed/cooled air when driving but it just sort of flows out due to air being taken in,

 

and i believe the control box/wiring is fine because i still can change between the heater and cold air along with the recirc and the ducting diverters

[Twinky]

Take the fan out and check the resistor coils on the unit. You will see two plugs connecting to the fan.

One is for the motor itself and the other is for the resistors. Give the resistors a very slight poke and squeeze, if they crumble then it is the resistors.

If you are electronically savvy then you can replace the resistors with better ones that have heat sinks on them, they are quite large but they don't

get as hot and last forever. If you are not so savvy got to your local wrekers and take one out of another fan unit, you can get the same resistors out of an AE92 but requires a little modification.

[ToasticlesAe82]

sick i'll see if i can do that sometime tomorrow arvo and let youse know how it goes

[Trev]

Take the fan out and check the resistor coils on the unit. You will see two plugs connecting to the fan.

One is for the motor itself and the other is for the resistors. Give the resistors a very slight poke and squeeze, if they crumble then it is the resistors.

If you are electronically savvy then you can replace the resistors with better ones that have heat sinks on them, they are quite large but they don't

get as hot and last forever. If you are not so savvy got to your local wrekers and take one out of another fan unit, you can get the same resistors out of an AE92 but requires a little modification.

 

What resistors are you talking about?

[Twinky]

The coils are resistive wire that can take alot of current and heat (wire wound resistor).

When you select different fan speeds you are selecting a different coil.

From memory the range was like 1 ohms to 1.5 ohms, something like that anyway.

 

Just some simple math:

Voltage = 12v Resistance = 1 ohms Current passing through coil = 12/1 = 12 amps.

Thats alot of current to pass through sutch a small wire, thus why the wire used is called a thermistor (thermal resistor).

It may be a little less as I think it's some sort of voltage divider to get the fan speeds different (changing the voltage on the motor).

 

I pulled mine apart quite a while ago cause my coils were fried and replaced them with heat sinked resistors.

Looks exactly like this one, but slightly larger.

Edited January 25, 2011 by Twinky

[ToasticlesAe82]

got a link to an ebay auction or site that sells em?

 

also what sort of resistance am i looking at for the resistor?

Edited January 25, 2011 by ToasticlesAe82

[Trev]

The coils are resistive wire that can take alot of current and heat (wire wound resistor).

When you select different fan speeds you are selecting a different coil.

From memory the range was like 1 ohms to 1.5 ohms, something like that anyway.

 

Just some simple math:

Voltage = 12v Resistance = 1 ohms Current passing through coil = 12/1 = 12 amps.

Thats alot of current to pass through sutch a small wire, thus why the wire used is called a thermistor (thermal resistor).

It may be a little less as I think it's some sort of voltage divider to get the fan speeds different (changing the voltage on the motor).

 

I pulled mine apart quite a while ago cause my coils were fried and replaced them with heat sinked resistors.

Looks exactly like this one, but slightly larger.

 

I know what a resistor is, I was asking what resistor you were talking about as the fan is next to the passenger kick panel and the fan speed resistor is up behind the fan controls.

[TRD ke70]

if you don't have ANY fan Speeds, it'll be because it doesn't have power to the fan motor.

Fuses maybe alright but there is also breakers in behind that kick panel, they round with a silver top, pull it out and bridge the connection and then try the fan on full speed.

 

If that doesn't work get yourself a test light and see if there is any power getting to the fan on HIGH speed.

 

The reason i say high speed as the resistors are bypassed when it's on full.

If it doesn't work on full/hi speed then the resistors won't have f@$k all to do with it, it's a power supply problem.

 

good luck mate

Edited January 25, 2011 by TRD ke70

[Twinky]

got a link to an ebay auction or site that sells em?

 

also what sort of resistance am i looking at for the resistor?

 

Don't bother as it would cost you less to rip out ones from another fan unit, it would also be easier.

I already had my resistors so it wasn't a problem for me.

As TRD ke70 stated, check that there is power on the fan first before anything else.

[Trev]

Should have just listened to what Chris (TRD ke70) said from the start, it is obvious that the switch is working as the compressor is still engaging, if you don't know what to look at then bring it to me as I have spares for it.