In addition to my previous “ACC blower goes crazy” post i started to disassemble the heater resistor in order to have it repaired again.
It has been said that the transistor inside the heater resistor is faulty when the symptons that i experience manifest. Here are the Toshiba 2SD1525 specifications of the dreaded TOSHIBA Transistor Silicon NPN Triple Diffused Type (Darlington Power Transistor).
I also found a couple of PDF’s describing the airconditioning electrical diagrams:
Air Conditioning Circuits (1 of 2)
Air Conditioning Circuits (2 of 2)
Update 2011-01-08:
Today i have received the transistors from Little Diode and i have replaced the transistor for the CDE 1995 heater resistor and i will replace the heater resistor in the CDE again.
As i was philosofing on the cause of the problem it could be the fact that the motor is jammed with leaves (as this engine compartment was looking like a autumn day in the park).
Just got back from swapping the heater resistor and it works! I am very happy with the results and now we’ll see how long the transistor will last. 😉
I also have taken the 1992 model apart which doesn’t have the sensor attached to the transistor.
Details:
CSE 1992
- Printed circuit board states: ALPS – ANK971004C
- Casing states: 4071775 – 287C
CDE 1995
- Printed circuit board states: ALPS – ANK971004C
- Casing states: 4632477 – 443C
Update 17-01-2010:
Now the heater resistor is broken again, i think that the blower is the culprit, this sucker needs to be replaced. I know that this job takes some effort. 🙁
-
- Heater resistor – Installed into an ACC’ed 9000 CDE – 1995 – SAAB partnr. 4632477 – 443V
-
- Heater resistor – There are two screws to keep the PCB to the heat sink and cover
-
- Heater resistor – Unscrew the PCB from the plastic cover
-
- Heater resistor – detailed overview PCB
-
- Heater resistor – Please note the screw here
-
- Heater resistor – Unscrew the transistor from the heat sink
-
- Heater resistor – PCB unmounted from the cover and heatsink
-
- Heater resistor – transistor 2SD1525 contact area
-
- Heater resistor – Sensor connected to transistor 2SD1525
-
- Heater resistor – transistor 2SD1525 is going to be replaced
-
- Heater resistor – connector still ok
-
- The transistors are delivered!
-
- Details from the Toshiba 2SD1525 – h42
-
- Getting ready for de-soldering and soldering.
-
- Out with the old and in with the new!
-
- Desoldered holes in the PCB
-
- Soldering in the new transistor… this was a mistake 😉
-
- Here the new transistor is in place but not mounted to the heat sink yet.
-
- Old heat sink compount to be removed.
-
- Clean again!
-
- New compount applied to the heatsink.
-
- And some compount applied to the transistor itself.
-
- While trying to mount the soldered transistor to the heat sink i had major troubles as the screw is very hard to align to the heatsink. So i decided to de-solder and mount first.
-
- Attaching the sensor to the PCB again.
-
- PCB mounted before soldering (again).
-
- First screw the PCB to the container prior to soldering
-
- Soldering the transistor to the PCB again.
-
- Have a close look at the heat sink… Which will perform better? 1992 or 1995?
-
- 1995 model – PCB states model “ALPS – ANK971004C”
-
- 1992 model – PCB states model “ALPS – ANK97802A”
-
- Different years -> different models (hence: the heat sink)
-
- First unscrew the resistor and wiggle it out of the air duct. For mounting do the reverse operation (Haynes style).
-
- Three brothers who claim the heater resistor area. Use a small nr.10 torx-driver for these suckers.
-
- Gently lifting the cover from the false bulkhead
-
- Removing the plastic cover from the false bulkhead. Eight 8mm bolts, a rubber seal, a wishwasher plug and to be removed.
