A/C condenser fan doesn't turn/spin (1 Viewer)

[Rdecode]

2006 / GX470

Air Conditioning condenser fan (CDS fan) doesn't turn/spin when AC is ON.

Question #1 - CDS fan must be always ON when AC is ON?
Question #2 - If the answer to the Question#1 is false, then when it turns ON?

Preface:
- Air Conditioning works fine, checked for leaks, refrigerant is added, pressure is OK, blows cold air both front/rear;
- CDS fan is fine, spins, checked by connecting 12V / Ground of battery;
- Pressure switch is OK, but we do not care about it (see below);
- Condenser fan (CDS fan) and compressor Magnetic clutch (MG CLT) relays are fine, checked.
- Fuse 20A CDS FAN, checked and OK;

Now please see the diagram:
- I have shortened pressure switch pins for testing purposes, in order to exclude its influence in CDS fan switching;
- When compressor turns ON, 12V on CDS Fan relay PIN1 against battery ground, PIN2 - 0V against battery ground - CDS fan DOESN'T SPIN.
You would think there is cut somewhere between CDS Fan relay PIN2 and ground, no I grounded it using extra cable directly, but fan still DOESN'T SPIN.
- It spins only when I manually shorten CDS Fan relay PIN5 and PIN3, but this is obvious...

Please, help to understand what is the problem and how it works!

 

[mtwilly87]

2006 / GX470

Air Conditioning condenser fan (CDS fan) doesn't turn/spin when AC is ON.

Question #1 - CDS fan must be always ON when AC is ON?
Question #2 - If the answer to the Question#1 is false, then when it turns ON?

Preface:
- Air Conditioning works fine, checked for leaks, refrigerant is added, pressure is OK, blows cold air both front/rear;
- CDS fan is fine, spins, checked by connecting 12V / Ground of battery;
- Pressure switch is OK, but we do not care about it (see below);
- Condenser fan (CDS fan) and compressor Magnetic clutch (MG CLT) relays are fine, checked.
- Fuse 20A CDS FAN, checked and OK;

Now please see the diagram:
- I have shortened pressure switch pins for testing purposes, in order to exclude its influence in CDS fan switching;
- When compressor turns ON, 12V on CDS Fan relay PIN1 against battery ground, PIN2 - 0V against battery ground - CDS fan DOESN'T SPIN.
You would think there is cut somewhere between CDS Fan relay PIN2 and ground, no I grounded it using extra cable directly, but fan still DOESN'T SPIN.
- It spins only when I manually shorten CDS Fan relay PIN5 and PIN3, but this is obvious...

Please, help to understand what is the problem and how it works!

View attachment 2327474

View attachment 2327475

Mine is not on all the time either. I think it only kicks on when extra cooling is needed. It’s intermittent.

 

[Rdecode]

1 year ago non-Toyota "refrigerant add" service guy told me that this is not normal, CDS fan should spin when compressor kicks on...

I went then to Toyota service, where official trained guy checked the fan the following way - he forced to stop by hand BIG engine fan, thus making some overheating and asked to start the car - in a few seconds engine started CDS fan has also started spinning - he said all is fine... the system is designed like that... CDS fan is controlled by refrigerant pressure (switch) and temperature...

Yesterday another non-Toyota "refrigerant add" guy told me - it should spin...

So, to whom we trust?

You all know noticeable A/C performance drop when car is in idle and not moving, that is why I have doubts