Electric Fan Question

[Charles Neff]

Under what conditions should the electric fan be running on my 1995 Crown Vic?

There is a two wire connector at passenger side, just behind the radiator which exits from the fan shroud. Is this the fan wires? Can I just apply 12V from the battery to test the fan operation? I presume the Red/Brown wire is the + (positive) and the Black is the ground (negative side).

Is there a relay that controls this fan? If so where is it located?

[ModMech]

On a '95 Panther, the electric fan should come on ONLY when the A/C pressure gets too high for the mechanical fan to deal with.

I do not have the pressure at which this fan activates here, nor do I have the relay location.

However, all that will happen if you get the wiring wrong (for testing purposes) is the fan will run backwards... no damage.

[Charles Neff]

Thanks for what you have given me so far but I really need a dynamic test to make sure it really works.

Yes I can test the Fan motor with 12V across it but if it runs how do I know that it's relay is kicking in or making contact outside of overcharging the A/C system and like you said... what pressure on high side and this brings in another question...which is I suspect is sensed by an opening of the high pressure switch...

Just got an idea... Tomorrow will run A/C and pull of the High pressure switch and see what happens... maybe fan will turn On!

[jimmytroanoke]

[quote=ModMech]On a '95 Panther, the electric fan should come on ONLY when the A/C pressure gets too high for the mechanical fan to deal with.

I do not have the pressure at which this fan activates here, nor do I have the relay location.

QUOTE]
This is from service manual for a 95 Grand Marquis. Makes no mention of the high side switch. Mine runs whenever the A/C is on.

Description and Operation

Some models are equipped with an optional electric cooling fan. The auxiliary cooling fan motor runs continuously when air conditioning is ON, and does not cycle ON/OFF with A/C clutch. Fan will shut OFF at speeds above 45 mph when coolant temperature is less than 220°F. It will also operate when coolant temperatures are above 220°F, even with A/C OFF.