PWM cooling fan(s) control using ECM

[samckitt]

Is there a preferred position where the AC pressure switch needs to mount? Between compressor & evaporator, evaporator - condenser, or condenser - compressor?

[Vince@Meanstreets]

Originally Posted by samckitt

Is there a preferred position where the AC pressure switch needs to mount? Between compressor & evaporator, evaporator - condenser, or condenser - compressor?

anywhere between the condenser and evaporator. #6 line

[65C6Corvette]

Originally Posted by Vince@MSperfab

anywhere between the condenser and evaporator. #6 line

Thanks,

This is helpful. Where did you install the trinary switch? Assuming that you also used it for the vintage air.

[parsonsj]

Where did you install the trinary switch? Assuming that you also used it for the vintage air.

You don't want to use a trinary switch when the fan is being controlled by the ECM. You should use a binary switch to protect the compressor from over/under charge since the ECM doesn't control that.

[Vince@Meanstreets]

Originally Posted by 65C6Corvette

Thanks,

This is helpful. Where did you install the trinary switch? Assuming that you also used it for the vintage air.

I usually put it right into the drier. But if I can't inline on the high side hidden in the fender.

Originally Posted by parsonsj

You don't want to use a trinary switch when the fan is being controlled by the ECM. You should use a binary switch to protect the compressor from over/under charge since the ECM doesn't control that.

Yes, there should be an AC input wire right? Let me see if I can find the pin #

[parsonsj]

Originally Posted by Vince

Yes, there should be an AC input wire right? Let me see if I can find the pin #

On the E67, the A/C request signal is via CAN request from the BCM, not a signal wire.

[Vince@Meanstreets]

Originally Posted by parsonsj

On the E67, the A/C request signal is via CAN request from the BCM, not a signal wire.

ECM fan request pins are a grounding circuit right?

[dontlifttoshift]

Originally Posted by mikels

Shroud is 609 mm wide x 585 mm tall ( 24x23 inches)

Fan itself is not much smaller.....

To anyone that has an SRX fan, can you measure the blade itself for me? Using the eyecrometer it looks like the fan itself is 20" or more but I would like to have an actual measurement.

Thanks!

[samckitt]

Has anyone found a decent price for the SRX fan? What prices are you finding?

[parsonsj]

Originally Posted by Vince

ECM fan request pins are a grounding circuit right?

Yes, in a non-PWM setup, the fans are requested by a ground circuit.