Heater fan and air con woes

Joined: 05 Jan 2004 Location: Campbelltown, Sydney

I have a strange problem with the heater fan and air con in my 4b.

Press the aircon button and it engages plus light on switch comes on.

Fan onto 1 and no fan but a/c is engaged.

Fan onto 2 and no fan but a/c is engaged.

Fan onto 3 and fan starts but a/d disengages and light on switch goes off.

Fan onto 4 and fan starts but a/d disengages and light on switch goes off.

???????????? Crying or Very sad

Joined: 30 Dec 2002 Location: Adelaide

Does your fan work on the lowest two speeds without the aircon switched on?

Joined: 05 Jan 2004 Location: Campbelltown, Sydney

murcod wrote:

Does your fan work on the lowest two speeds without the aircon switched on?

Nope, only on the top 2 and A/C only the low two.

Joined: 09 Nov 2002 Location: Traralgon Vic Aust.

Your fan speed resistor is open circuit on speed one and two. It will be somewhere in the heater box (to keep resistor cool) Find and remove it. You may find that the resistor coils are broken..

Joined: 05 Jan 2004 Location: Campbelltown, Sydney

Can someone post a pick of what it looks like. Think I found the thermostat for the A/C but disconnecting did nothing nor bridging it.

Joined: 30 Dec 2002 Location: Adelaide

Here's what a Feroza one looks like, they're normally mounted in the air ducting somewhere near the fan motor. Your's should be similar- try fixing that first and then see how you go from there.

http://www.outerlimits4x4.com/PHP_Modules/phpBB2/viewtopic.php?t=7806

Joined: 05 Jan 2004 Location: Campbelltown, Sydney

murcod wrote:

Here's what a Feroza one looks like, they're normally mounted in the air ducting somewhere near the fan motor. Your's should be similar- try fixing that first and then see how you go from there.

http://www.outerlimits4x4.com/PHP_Modules/phpBB2/viewtopic.php?t=7806

Thanks for that. Found mine and although a little larger, there was a break in the same place (third coil of the main winding). Can a solder join be used to bridge the 1 - 1 1/2 mm gap?

Joined: 09 Nov 2002 Location: Traralgon Vic Aust.

May work. They do generate alot of heat at low fan speeds and the solder can melt..

Joined: 30 Dec 2002 Location: Adelaide

Buy a new one - or do a fix like I did with high wattage resistors. Even if you managed to get the solder to take to the wire it wouldn't last long.

The wire on the coils has obviously melted from overheating and it would have a lot higher melting point than solder. The coils glow red hot if they aren't in a good airflow (found that out when fixing mine!) and solder will start to melt at above around 250 degrees Celcius.