VZ Thermo Fans N/W

[Waughy]

http://carprogrammer.com/Z28/PCM/LS1/Holden_LS1.pdf

Have a look here. I know it's for the LS1, but there's a section on the cooling fans with a diagram, not sure if it's any different on the 6L?

[Timbo_hx55]

http://carprogrammer.com/Z28/PCM/LS1/Holden_LS1.pdf

Have a look here. I know it's for the LS1, but there's a section on the cooling fans with a diagram, not sure if it's any different on the 6L?

Cheers, some very good info/reading in there, some more homework to do now !! Thanks again. Tim.

[VTClubSprtR8]

I can only see two relays in the engine bay fuse/relay box, one labelled engine cooling fan 1, the other labelled engine cooling fan 2.

Ok The third fan relay should be to the right, right next to the Cooling Fan Relay 1 viewing the fuse box from the drivers side fender. Now if it's not there and just got provisions for one your car may only have the 400Watt cooling fan system in it, and hence only the two cooling fan relays. Sedan, Utility and wagon had the 400watt system installed from factory.

If the third relay is there the vehicle has the more powerful 430Watt cooling fan system, that came out with 2WD/AWD Crewcab models,(like yours).

[mcsquirt]

Guys,

As the VZ's (LS1's) age the coopling fans will fail....

Just so you know what is normal:

1. With the A/C ON BOTH FANS (little one plus big one should come on) << LOW SPEED

2. When TEMP get to about two needle widths BELOW 1/4 BOTH FANS come on "LOW SPEED"

3. IF TEMP gets to two needle widths ABOVE 1/4 Both FAns should switch to HIGH SPEED.


If you find only one fan working or you don't get HIGH SPEED ON BOTH FANS at above 1/4 TEMP
you probably have a failed FAN.... Before you replace the FAns there is a 4 PIN Relay that controls
LOW SPEED and a 5 PIN Relay that Controls HIGH SPEED --0-- Replace these First (It costs about $27 fro
the two relays from Holden) The Small & Large Fans together (Genuine Fans) will set you back around $700...

[chrism]

Apologies for digging up an old thread but this exact thing is happening to my VZ at the moment. Replaced the relay and the fuse, pulled the fans out and connected to 12v and both fans spin so the motor is still good. Just wondering if the thread creator found a solution in the end? Next step is gonna be to replace the coolant temperature switch to see if that makes a difference.

[Woodchukka]

Apologies for digging up an old thread but this exact thing is happening to my VZ at the moment. Replaced the relay and the fuse, pulled the fans out and connected to 12v and both fans spin so the motor is still good. Just wondering if the thread creator found a solution in the end? Next step is gonna be to replace the coolant temperature switch to see if that makes a difference.

Why did you replace the fuse? Was it blown??? Is your coolant temp gauge reading anything? If so don't head for the sensor. You could go into the engineering mode. Hold both Mose and Set buttons in and turn on the ignition you can then scroll through to see the actual coolant temperature.

[white lie]

So they're running at different speeds or only one is working?
Have a good look at the wiring, particularly the plugs. Common for them to corrode or have a poor connection or if some work has recently been done, not plugged back in...it may not even be recent work, they may have been like that for a while and you've only just noticed.

But as said, get a proper temperature reading and report back at what temps they are coming on/off.