I copied this procedure from alldatadiy.com. Online service manual, not free but convenient. The step numbers would not copy/paste. I don't know if it is the best procedure, having never done it myself (yet)
. Have fun!
1995 Mercury Mystique V6-153 2.5L DOHC
Top - Vehicle
Engine, Cooling and Exhaust
. Cooling System
. . Radiator Cooling Fan Motor
. . . Service and Repair
.
Notes
Service and Repair
Cooling Fan Motor
NOTE: The fan shroud, engine cooling fan motor and fan blade are not serviced separately.
REMOVAL
Drain engine cooling system.
Disconnect battery ground cable.
On 2.5L engine equipped vehicles, disconnect wiring harness connector from A/C cycling switch.
Remove main wiring harness retaining push pin from fan shroud and disconnect main wiring harness from retainer brackets located at top of fan shroud.
Move main wiring harness aside.
Remove cooling fan wiring ground cable from RH front fender apron.
Remove upper radiator hose from radiator.
On 2.5L engine equipped vehicles, remove radiator overflow hose from radiator.
Remove transmission oil cooler tube from oil cooler inlet fitting (if equipped).
Raise vehicle on hoist.
Remove lower radiator hose from radiator.
Remove transmission oil cooler tube from oil cooler outlet fitting on radiator (if equipped). NOTE: Loosen transmission oil cooler tube while holding radiator connector with back-up wrench.
Disconnect A/C clutch field coil at wiring harness connector.
Remove transmission oil cooler tube from retaining bracket located at front of front sub-frame (if equipped).
Remove transmission oil cooler tubes retaining bracket from front sub-frame (if equipped).
Support fan shroud, radiator and A/C condenser core with a suitable jack stand. Remove radiator lower supports from front sub-frame.
Remove two retaining bolts for A/C condenser core from brackets at bottom of radiator.
Position jack stand aside and carefully remove the fan shroud and radiator as an assembly.
On bench remove fan shroud from radiator.
INSTALLATION
Install fan shroud to radiator.
Position jack stand and install the fan shroud and radiator as an assembly.
Install two retaining bolts for the A/C condenser core to brackets at the bottom of the radiator. Tighten to 2.7-5.4 Nm (24-48 lb-in).
Remove jack stand. Install lower drive belt idler pulleys to front sub-frame. Tighten retaining bolts to 8-11 Nm (71-97 lb-in).
Install transmission oil cooler tubes retaining bracket to front sub-frame.
Install transmission oil cooler tubes to retaining bracket located at front of front sub-frame (if equipped). Tighten bolts securely.)
Connect A/C clutch field coil to wiring harness connector.
Install transmission oil cooler tubes to oil cooler outlet fitting on radiator (if equipped). Tighten to 24-31 Nm (18-23 lb-ft).
Connect lower radiator hose to radiator. Tighten clamps securely.
Lower vehicle.
Install transmission oil cooler tube to oil cooler inlet fitting (if equipped). Tighten to 24-31 Nm (18-23 lb-ft).
On 2.5L engine equipped vehicles, install radiator overflow hose to radiator.
Connect upper radiator hose to radiator. Tighten clamps securely.
Install cooling fan wiring ground cable to right-hand front fender apron.
Position main wiring harness.
Install main wiring harness retaining push pins to fan shroud and connect main wiring harness to retainer brackets located at top of fan shroud.
On 2.5L engine equipped vehicles, connect wiring harness connector to A/C cycling switch.
Connect battery ground cable.
Fill engine cooling system.
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