Question about radiator fan

[bronsin]

The fan for my radiator comes on, but it spins very slowly. The problem is my air-conditioner only cools the air about 20°. Does this fan have a thermostat on it,?

Isn’t this fan supposed to spin at full speed?:iono: Inquiring minds want to know!

[tmontague]

There are 2 speeds controlled by two separate relays.

Iirc the fan should spon fast when the a/c is on

[bronsin]

I see. Maybe it’ spins slowly when it’s not so hot Like this morning?

[komichal]

When I turn the AC ON, the fan starts to spin slowly (and it cannot be heard over the idling engine). But usually in a minute or two the fast spin kicks in and the fan noise overwhelms the engine noise.
Still, it takes up to 5 minutes for the AC to start blowing the cool air if the car has been parked for 24hrs. Toyota authorized service center found no problem with AC components, nor did another independent service guy. So I just assume the AC of this 12-year-old can has been designed this silly way or it is simply too old.

[bronsin]

no matter how hot it is Or how long you wait, my fan never kicks into high. We’ll see what the shop says tomorrow

[toyotavios_11]

if a/c high pressure more than 190psi, radiator/condenser fan will spin at fast speed

[tmontague]

if a/c high pressure more than 190psi, radiator/condenser fan will spin at fast speed

If that is the case then maybe the OP's pressure is a bit low

[Bony_ahmed]

no matter how hot it is Or how long you wait, my fan never kicks into high. We’ll see what the shop says tomorrow

check the fan relay first, this happened to me once......my fan relay was bad

[BLH]

In my 2007. The fan is turned On by a relay and has a resistor is in series with the fan motor. Lowering the voltage to the fan motor. That give you low speed fan.
A second relay shorts out the resistor so full voltage is on the fan motor. It could be the relay that shorts out the resistor for high speed fan.

[toyotavios_11]

Relays are located at fuse box in the engine compartment and the resistor is located at right behind the left head lamp which is in between the lamp and intake box.

[bronsin]

Unfortunately problems with my medication lead me to cancel mine appointment with the mechanic.

I’m thinking I will replace relay number two Myself. Can someone give me the part number? Thanks!

[toyotavios_11]

Unfortunately problems with my medication lead me to cancel mine appointment with the mechanic.

I’m thinking I will replace relay number two Myself. Can someone give me the part number? Thanks!

85928-52030 RESISTOR, COOLING FAN
90987-04004 RELAY, COOLING FAN, NO.2

[bronsin]

Perfect!

[tmontague]

One of the fan relays is not located in the under hood fuse box and I cant remember of hand where it is located but I remember is being built into a module and it is not a simple relay swap

[bronsin]

I consulted my 2001 Toyota Echo service manual and they have a procedure to test the relays. You test circuit 1-2 for continuity. Then you put 12 V on it and test the other circuits for continuity.

Relay one is stuck and won’t come out. Relay two isa smaller and hard to get a hold of.

[bronsin]

I got relay two out And the last five numbers of the relay are indeed 04004. Now I have to get some alligator clips so I can test the relay and see if it’s bad

[bronsin]

Here is the relay

https://www.amazon.com/90084-98032-90987-04004-TN156700-1062-Purpose-Toyota/dp/B07NPK263X

[bronsin]

A new fan two relay didn’t fix the AC. :cry:

Or make the fan run fast it only runs slow

[toyotavios_11]

is your a/c refrigerant at optimal quantity. please send for pressure check. i doubt your a/c is having low refrigerant.

[bronsin]

Car goes to shop friday

[rayfloyd170]

Hi @bronsin Di you solve your rad fan issue running slow? Or you changed with new motor?

Mine has the opposite it always run high speed no matter what and lost the low speed.

I got the gen 3 yaris. I tested the fan relay no.1 and found okay, even swapped it with horn relay which is exact same part number.

I tested fan relay no.2 and found okay too.

I removed the resistor and tested it and got 1.3ohms which is what the spec should be...

I was left with the Pressure Switch but when i tested it also found it to work fine.

Then i remembered, i did an evaporator change about 6 months ago and the mechanic added some oil too during R134a recharge. I was thinking the mechanic may have overfilled my AC system with some refrigerant and ND-8 oil, he didn't use a weighing scale but only had the gauge manifold and touching of the LP pipe.

This led me to vent a little of the refrigerant containing lots of oils (not allowed in U.S.) and there goes my Low Speed Fan kicking and when my engine is hot it uses the High Speed.