Easy fix - heater blower resistor 24V HJ60

[Luke77]

My heater blower was not running at all anymore, except at the highest speed. So it had to be the heater blower resistor.

It indeed was the resistor, completely in pieces (somewhat extra destroyed due to my resistance measurements):

Heater blower resistor I

• Luke77
• Sep 19, 2018

A new TOYOTA resistor can't be found anymore, so my solution was replacing the coils with new resistors. Although seemingly after-market can be found at approx. €65,-.

I measured the resistance for each coil as good as possible, which gave me me approximate ohms for the replacement resistors.
I used the letters on the back for reference so I could replace them at the right spot.

Heater blower resistor II

• Luke77
• Sep 19, 2018

And below the diagram (NOTE: the ohms are estimates by measuring as good as possible over the damaged coils):

Replacement resistances

• Luke77
• Sep 19, 2018

 

[OGBeno]

Cool fix.

But to correct one bit of information, the blower/resistor in 24v flavor is still available from Toyota as a DENSO part.

Great work here.

 

[Luke77]

Resistance L -> M (5 ohm) was a correct measurement, because the coil was still intact (although I have replaced it).
Resistance M -> H (4 ohm) was a broken coil, but measurement is more or less correct, because I could add up both parts of the broken coil.
Resistance H -> EH (10 ohm) was difficult due to severe damage; I could only measure 1.5 coil and had to extrapolate it to a complete coil of about 14 windings

If other people will also replace their coils, could you also measure your intact coils and reply those measurements under this thread. In this way we will be sure about the correct replacements for future repairs.

The heater blower is working correct now in all the positions, but the lowest setting could give a little bit more airflow; therefore I guess the resistor H -> EH could have been a little less (about 7-8 ohm). Although for now I will leave it like this, because it is working good enough.

I have used 10W replacement resistors and with values closest to my measurements I could find (4.7 ohm, 3.7 ohm and 10.0 ohm respectively).

 

[Luke77]

And below after soldering the parts together:

Soldering II

• Luke77
• Sep 19, 2018

Soldering I

• Luke77
• Sep 19, 2018

And when putting everything back in place, separate the resistors as far a possible so the airflow in the compartment can cool each resistor as good as possible (they will get hot):

Soldering III

• Luke77
• Sep 19, 2018

 

[Luke77]

Cool fix.

But to correct one bit of information, the blower/resistor in 24v flavor is still available from Toyota as a DENSO part.

Great work here.

I did some searching on the internet and I think I found it under number 87138-90A00 as a DENSO part.

Advantage: my replacement parts were only $6,- total and gave extra fun in repairing it.

 

[Luke77]

I just not hold of an original 24V blower resistor 87138-90A00 (DENSO). I had to measure the resistance in the coils. Seemlingly my readings in the old post were not completely correct -> was difficult due to damage and old wiring. In the pictures the new part and the correct readings for each coil.

My repair worked, but not it will work even better.

 

[Luke77]

Yep, runs smoothly...

 

[ToyotaMatt]

i offer the updated / superseded Genuine NipponDenso Japan Spec. Parts 24V Blower Resister to the one above :


My kit form kit comes with the most up to date heavy duty SUMITOMO 4 pin locking housing and extra terminals

Those crimps are 40 + years old

Refresh / Repair / Restore

snip , strip , crimp , plug , play ….

THIS IS THE WAY …

24V volts NOS OEM Toyota Blower Resister 87138-22030 Fits : FJ60 Fj62 BJ60 Cressida 1980-1990 (Copy) - VintageTEqParts.com

24V volts NOS OEM Toyota Blower Resister Fits : BJ60 BJ61 HJ60 HJ61 1980-1990

vintageteqparts.com

 

[ToyotaMatt]

.

 

[Luke77]

To my great annoyance the new OEM blower resistor burned through after less then one year. It is the "low speed cool". Can anybody tell me what the reason could be?

 

[Luke77]

Figured it out, there was a cable breakage near the connector > seemingly the blower sometimes stopped while driving > no cooling of the resistor by the air flow in the ventilatie system > overzetting > damage...