Cooling fan relay switch location 1985 Oldsmobile Regency .

In the engine compartment fuse block. Look at positions 7 and 8. There should be a diagram under the lid.

http://www.tomanual.com/search/diagram+for+1998+oldsmobile+regency+cooling+fan+control
http://www.automotix.net/autorepair/diy/1998-oldsmobile-regency-wiring_diagram.html

no diagram ,sorry , but usually located in the fuse/relay box in the engine compartment and the cover will have list of which is which

Its either t

• HOME
• REPAIR HELP
• PRODUCT AND HOW TO INFO
• C
• COOLING FAN SWITCH
• TEST

Cooling Fan Switch ABCDEFGHIJKLMNOPQRSTUVWXYZ Inspect/Test/Replace

To find the RADIATOR COOLING FAN MOTOR RELAY, we need additional information about your 1995 Oldsmobile Aurora 4.0L SFI DOHC 8cyl.
Please select one of the following:

• Number one
• Number three
• Number two

The Radiator Cooling Fan Motor Relay is located: Under hood, passenger side, upper firewall, mounted in corner in relay block
When testing a cooling fan switch, first test it with the engine cold, then test it when the engine reaches a specified temperature. Check your vehicle's service manual for more directions.
To check a switch, disconnect the connector at the switch. with an ohmmeter, check for continuity between the terminals of the switch with the switch moved to the on position and to the off position.

To find the RADIATOR COOLING FAN MOTOR RELAY, we need additional information about your 1995 Oldsmobile Aurora 4.0L SFI DOHC 8cyl.
Please select one of the following:

• Number one
• Number three
• Number two

The Radiator Cooling Fan Motor Relay is located: Under hood, passenger side, front side of wheelwell, mounted in relay panel
The continuity through a switch can be checked with an ohmmeter. With the switch open, there should be infinite resistance. With the switch closed, there should be zero resistance. With the switch off, there should be no continuity between the terminals. With the switch on, there should be good continuity between the terminals. If the switch is activated by something mechanical and doesn't complete the circuit when it should, check the adjustment of the switch. (Some switches are not adjustable.) If the adjustment is correct, replace the switch. Another way to check a switch is to simply bypass it with a jumper wire. If the component works when the switch is jumped, a bad switch is indicated.
Voltage drop across switches should also be checked. Ideally, when the switch is closed there should be no voltage drop. Any voltage drop indicates resistance and the switch should be replaced.
he fan motor,the fan switch,or the coolant temp.sensor.

Hi!!
The cooling Fan Pressure Switch is located on the side of the Radiator, usually below the upper hose. It is available at AutoZone or similar auto parts store for about $20. Here is a pic. of the Switch to help you identify it.

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Fig. 1: Location of the oil pressure switch - others similar (click for zoom)

To removal...

1. Disconnect the negative battery cable.
2. If necessary for access, raise and safely support the vehicle.
3. If necessary, drain the engine oil into a suitable container.
4. Detach the switch electrical connector.
5. Remove the switch.

Fig. 1: Typical electric fan motor and resistor locations

Hope helps (remember to rate this answer).

its under hood on side panel it's black take top off look for relay that says fuel

FIRST SCAN CAR TO SEE IF COOLANT TEMPERATURE SENSOR IS WORKING SEE IF YOU GETTING ECTS CODES. IF NOT CHECK THE COOLING FAN FUSE AND RELAY.IF BOTH GOOD HOTWIRE THE COOLING FAN USING JUMPER WIRES TO CAR BATTERY.IF FAN DONT WORK REPLACE THE COOLING FAN MOTOR ITS FAULTY.

If the blower motor,or the cooling fans are staying on,then it is a relay stuck.Find the relay,by removing relays one by one,replacing them back as you go.When the relay is unplugged,the fan will go off,If you put it back in,it will probley not come back on unless you turn the ac back on,then it will do it again.Replace the relay with a new one.I hope this is helpful,let me know if it is.

Your cooling fan is controlled by a temp switch and ac on/off. If it doesn't ever come on check fuse, check relay and check temp sensor. run diagnosticscould help..check fan motor with 12 volt power