Merkur Xr4ti L4-140 2.3L SOHC Turbo (1985)
Radiator Cooling Fan Motor: Customer Interest
Engine Cooling Fan - Runs With Ignition OFF
Article No. 86-11-5
FAN - ENGINE COOLING - RUNS WITH IGNITION OFF UNTIL ENGINE COOLS - UNDESIRABLE NOISE
MERKUR 1985-86 XR4Ti
The Merkur XR4Ti engine cooling fan electrical system was designed to activate the fan whenever the engine coolant temperature reaches 210~F
(98~C), even though the engine may be stopped and the ignition is in the "off" position. This was done to reduce underhood temperatures after engine
shutdown and reduce any potential for fuel vapor lock. However, the addition of shims between the cylinder head and injectors have precluded this
requirement.
Vehicles built after May 3, 1986 have updated circuitry which allows the cooling fan to run only with the ignition switch in the "on" position. This will
alleviate customer complaints of noisy fan afterrun. Vehicles built prior to May 3, 1986 can be updated with the procedure which follows. However,
those vehicles not equipped with injector shims should have shims installed in conjunction with this procedure (TSB 85-14- 9, dated July 17, 1985).
1.
Position the windshield wipers to a straight up (vertical) position on the windshield to obtain clearance between the wiper linkage and fuse box.
2.
Disconnect the battery negative cable.
3.
Remove the left side lower instrument panel trim cover for access to the main wire harness leading to the fuse box.
4.
Remove the wire harness retention strap to allow some movement of the harness.
5.
Remove the fuse box cover and position it close by for reference to relay and fuse locations in the fuse block assembly.
6.
Using a flat screwdriver, release the fuse block from the fuse box tabs and raise it as high as possible for access to the connecting wires attached to
the bottom side.
7.
Remove the tape wrap from the wire harness for additional accessibility of the wires.
8.
Using the fuse box cover for reference, identify relay No. 1 and locate the double red and yellow wire lead connected to the fuse block at that
position.
9.
Observe which of these wires leads into the wire harness and which one leads to fuse No. 11. Cut the wire leading to the harness as close as
possible to the connector.
10.
Cut the remaining red and yellow wire half way between relay No. 1 and fuse No. 11.
11.
Splice the wire cut in Step 9 to the cut wire leading to fuse No. 11. Use a suitable connector or solder the splice.
12.
Splice the remaining wire (attached to relay No. 1) into the black and white wire leading to 10 amp fuse No. 5. Use solder or connector and tape
all splices.
13.
Install new tape to the wire harness (removed in Step 7).
14.
Position the fuse block back into the fuse box.
NOTE:
The red and yellow relays must be on the outboard side to properly seat the block.
15.
Install the fuse box cover.
16.
Install new harness retaining strap at the instrument panel and reinstall the lower trim panel.
17.
Check the system as follows:
a.
Remove the connector from the fan control switch on the lower manifold and place a jumper between the contacts of the connector.
b.
Connect the battery. With the ignition "off" the fan should not run. With the ignition "on", the fan should run.
c.
Remove the jumper and reinstall the connector to the switch.
OTHER APPLICABLE ARTICLES: 85-14-9
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
