Tamora heater blower

[SS2.]

I've searched the forums but didn't find any posts which dealt with the same symptoms.

In short, the heater blower on the Tamora seems to have stopped working - it's a 2005 with AC.

With the AirCon off, none of the blower LEDs light up.

With the AirCon on, the blower LEDs scroll up as normal, but there's still no fan activity.

There are several posts on here with problematic heater amplifier modules but, in all those cases, the blower LEDs remained active.

I plan to inspect the amplifier as a matter of course, but wondered if anyone has thoughts / experience on why the state of the blower LEDs would be affected by the position of the AC switch ?

[SS2.]

Granturadriver said:

Which LED lights do you mean, the temperature (blue to red) or the fan level lights (green)?

The temperature LEDs are fine.

It's the fan level LEDs which only light up when the AC is switched to on.

No activity from the fan either way.

[SS2.]

non_linear said:

The fan speed "amplifier" is a separate circuit to the one that controls the indicator LEDs, so I don't think this is an "amplifier" problem.

That was my thinking, too.

Regardless, I checked & remade the connections to the amplifier (all seemed OK), but it seems the blower rotary switch itself might be at fault - after some forceful back and forth, the blower (and LEDs) kicked back into life. Happy days.

Still unsure why the blower didn't work but the fan level LEDs lit up when the AC was set to on, but that's one for another day.
Cheers for the suggestions, chaps

[SS2.]

T350Craig said:

If you locate the fan speed controller in the passenger footwell you will probably find one of the pins on the plug has burnt out, there is a high amp draw when the fan first starts and it melts the plug. Best fix is to solder a new plug to the controller and put a new plug on the wiring harness that will cope with the current. Also make sure the fan speed is on its lowest before turning the car off each time.
The LED’s still work because it’s the pin that feeds the pulse width signal to the motor that has burnt out
Hope this helps

Cheers Craig.

Per my last post, it seems to be the fan switch itself - some forceful wiggling did get the LEDs on and the fan blowing.

What I still don't understand is why, with the AC switched on, the LEDs on the fan speed control switch light up, irrespective whether the fans are running or not.

Still, I can now demist the windows so all is good !