Heater/blower not working

[DonaldNZ]

OK,
I have a element socket if required

[DonaldNZ]

speed controller [replaces older fan speed resistor] for ~12 speed heater fan controller

I may be able to get a new one locally [christchurch] if required.
3 terminal device
guess 1 terminals
one terminal going from low [0v] to hi [~5 ~12v] pulled high via speed control brain
one terminal ground
one terminal to heater fan

heater fan
one terminal to speed controller
other terminal to batt +

guess 2
one term going from hi to lo [12v to 0v] pilled low via speed control brain [heater control]
one terminal to batt+
one terminal to heater fan

heater fan
one terminal to speed controller
one terminal to ground

wizard speed controller .jpg

[stardog]

I just used 1 out of Holden Frontera 3 pin works fine cost 25 bucks that was a couple of years ago.

[DonaldNZ]

sweet

[TimboTheKiwi]

Thanks for the help chaps. I got into the blower motor and cleaned some terminals and it did remedy the problem. The problem was intermittent so hopefully the issue won't be back but cheers nontheless

[TimboTheKiwi]

Hello again,

Damn problem which has been intermittent up until now has resurfaced. The heater blower motor won't function in any setting mode at all (there are 11 stops on the dial) which is not ideal going into the colder seasons.
What I have done so far...
- Checked 20a fuse under bonnet - all good (it actually had a 10a but was still intact).
- Pulled the blower motor and put 12v down it - all good functions smoothly.
- Pulled the relay (under the dash by the motor) - tested and all good.
- I pulled the resistor (going into air box) but not quite sure how to test this. It is a 3 pin and all the videos I see testing these are 4 and the people testing these have the spec values (ohms resistance) for their vehicle, which I don't have. As far as I understand (thanks to DonaldNZ) I can take this out of the loop by pulling the 3 wires going to the resistor and joining the 2 larger wires together? Does that sound correct or am I confusing this with taking the relay out of the loop?

If someone may be able to clarify another thing. Where that 20a fuse is under the bonnet there seems to be another relay which is labelled 'Heater' (not A/C compressor) which I haven't even looked at as I am not sure what it is? My understanding is the relay for this is under the dash by the motor. Is the under bonnet one for the whole cluster of switches relating to heater function perhaps? Fyi power is getting to the heater cluster as the lights illuminate, I can only assume all is working well there. Any help would be awesome!

Thanks again chaps!

[stardog]

Hi Timbo there are 3 relays under the bonnet for the heater plus 1 fuse for the blower and 1 more fuse in the cab for the heater.
Here is the diagrams i have for them hope it helps you out.

[TimboTheKiwi]

Oh geeze that sounds like a few things to check...thanks Stardog - bloody legend!

[TimboTheKiwi]

Soo got a little tied up remedying a alternator issue which turned into a complete rebuild of the thing...how annoying are alternators to get all back together lol.

Now back to my original issue - good fun these older trucks huh! I tried all the fuses and relays as stardog recommended but they all tested fine. Lets say I want to take the fan resistor out of the equation and have only the 'high' setting operational - question being would you cut the 2 large wires going into the resistor (leaving the other smaller wires intact and in place in the resistor) and join them together? Or have I got that wrong...

Thanks in advance!

[stardog]

Hi Timbo
I would also check the wires to the sensors switches on the thermostat housing i had a wire come off a sensor and had nothing on the climate control worked no fans or lights zippo.
I also found a broken wire on my pressure switch for the air con radiator and that caused problems as well .
It doesn't take much to do your head in on this heater and air con set up in the wizards the closest i found to the wiring for the heating and air con control is in a Holden Frontera manuals.