No Interoir Fan... No Heat No AC...

[DKDMC]

Correct

So I have poked around with my multimeter. It seems I have no power at my fan circuit breaker... What could be the cause of that?

Frustrated :/

[Bitsyncmaster]

So I have poked around with my multimeter. It seems I have no power at my fan circuit breaker... What could be the cause of that?

Frustrated :/

I'm assuming you check both sides of the breaker. So you have a broken connection since the blower power would come directly from the battery. You would need to pull the wood panel off the back to get to the junction of wires coming from the battery.

[DKDMC]

I'm assuming you check both sides of the breaker. So you have a broken connection since the blower power would come directly from the battery. You would need to pull the wood panel off the back to get to the junction of wires coming from the battery.

I did check both sides. I'll pull the panel tonight and see what I can find.

[David T]

I did check both sides. I'll pull the panel tonight and see what I can find.

The power for the radiator fans circuit breaker comes out of Relay 112 (T). You need to check for power there if you don't have any power at the circuit breaker. It is in the bottom row 2nd from the left. One big thing to look for is if any terminals have worked their way loose and "backed out" of their position in the plastic block so that the terminals of the relays do not make contact when inserted.

[DMC5180]

Very strange, the blower fan feed wire comes from a large crimp clustered brown wire junction. Just for grins, do a continuity test between the breaker terminals and POS battery terminal.

All Solid brown wires are +12v LIVE feeds.





Dennis

[David T]

Very strange, the blower fan feed wire comes from a large crimp clustered brown wire junction. Just for grins, do a continuity test between the breaker terminals and POS battery terminal.

All Solid brown wires are +12v LIVE feeds.

Dennis

Before you do that continuity check disconnect the battery! My wiring poster shows the power coming from that cluster and going to the fan relay and then on to the circuit breaker. There are differences among the cars, maybe some got wired differently. If everything else coming out of that cluster has power I would doubt that is where the problem is. Are you sure you are correctly checking for power? Do you have a good ground? Can you measure power anywhere else?

[DKDMC]

Before you do that continuity check disconnect the battery! My wiring poster shows the power coming from that cluster and going to the fan relay and then on to the circuit breaker. There are differences among the cars, maybe some got wired differently. If everything else coming out of that cluster has power I would doubt that is where the problem is. Are you sure you are correctly checking for power? Do you have a good ground? Can you measure power anywhere else?

Yes I've been Able to measure properly in multiple locations. Could a bad fan speed switch cause this?

[DMC5180]

Yes I've been Able to measure properly in multiple locations. Could a bad fan speed switch cause this?

No .The fan speed switch is down stream of the fan breaker. You stated you didn't have power at the fan breaker.


Dennis

[David T]

Before you do that continuity check disconnect the battery! My wiring poster shows the power coming from that cluster and going to the fan relay and then on to the circuit breaker. There are differences among the cars, maybe some got wired differently. If everything else coming out of that cluster has power I would doubt that is where the problem is. Are you sure you are correctly checking for power? Do you have a good ground? Can you measure power anywhere else?

Please disregard the above, previous, post.
I confused the cabin fan and the radiator fans. The circuit breaker for the cabin fan is directly powered from the N (brown) cluster. Since that is before the fan switch, a bad fan switch can't cause a loss of power at the circuit breaker. If you don't have power on the brown wire there is a break between the circuit breaker and the N cluster.

[DKDMC]

No .The fan speed switch is down stream of the fan breaker. You stated you didn't have power at the fan breaker.


Dennis

Thanks Dennis. Makes sense. This has been a tough one. I'll keep digging through and testing..