86 300E Aux Fan Resistor Question

[Phalcon51]

Just curious - on my 86 300E should my aux. fan run at different speeds depending on whether or not the a/c is on? It seems to run at one constant (max) speed whenever it's on, whether from the a/c or just mild overheating. Isn't the resistor supposed to make it run slower under some conditions? The resistor visually appears intact and the connections are corrosion free. Is there an easy way to accurately test it? (it's sort of buried under the ABS unit, so a little hard to reach) I've done a search and didn't really find an answer for this.

Thanks for any help.

[Arthur Dalton]

Jumper the a/c high pressure switch at the reciever/drier... that will energize the low speed fan [ using the resistor.]
High fan [ no resistor]is only when coolant temps are above 105C and has nothing to do with low fan... the two just share the same fan motor, but completely different circuits/relays/sensor/fuses...

[Phalcon51]

Thanks for the reply.

Should the speed differential be quite obvious, because I can't say I've ever noticed a difference. Is there an easy way to jumper the hi-speed fan circuit to test it as well?

[A264172]

Originally Posted by Phalcon51

Thanks for the reply.

Should the speed differential be quite obvious, because I can't say I've ever noticed a difference. Is there an easy way to jumper the hi-speed fan circuit to test it as well?

I am thinking the varable speeds came on later models, and an 86' has one speed only?

[Arthur Dalton]

< __________________
>>

OK .
If there is a dropping resistor , it is b/c there are two fan speeds .

The high will be jumpering the 105C coolant sw..

[Phalcon51]

Originally Posted by Arthur Dalton

If there is a dropping resistor , it is b/c there are two fan speeds .

The high will be jumpering the 105C coolant sw..

Thanks, I was thinking the same thing about the resistor. Can you tell me where the 105C switch is located, or what color wires it uses?