I'm trying to locate the coolant sensor on a 98 crown vic 4.6L
interceptor. My best guess is that it is under the front of the intake
on the drivers side. Can someone please confirm this? I'd hate to
start tearing into this and find out it is located elsewhere or that it
has dual sensors...
The problem with the car is that the fan sporatically runs, then shuts
off even when very hot. It looks like the ECT sensor wire may have
come into contact with the exhaust manifold. The wire loom is melted
and a closer inspection revealed damage to the shielding of the wire.
At least this is where I am going to start in solving this problem...
Thanks in advance for your advice and help!
Thanks for your response ShoeSalesman.
The burnt wire leads to what appears to be a standard cooling sensor.
However, the view I have is obstructed by the intake manifold. This
sensor appears to thread directly into the intake side of the driver
side head, and it is just beneath and behind the thermostat housing.
the AC(possibly not *right* away because it most likely reads high side
pressure not just the air being on) so, Its not likely that you have a
sensor problem causing the fan problem. I would check the fan operation
with the air on to see if its more consistent. I would also swap out the
fan relay with another in the box to confirm its not bad. Keep in mind
it could be because of that wire of coarse---so, of coarse fix it or
atleast check the burned area closely (no shorts or opens in the wire).
I think you will have a sensor for the ECM and one for the gauge. So,
yes, 2 of them. I don't think it will be the ECM's sensor or you would
get a check engine light. Oh, and not the gauge's sensor either. My best
guess would be a bad connection, relay, or even the fan motor. Wiggling
wires is always and easy thing to do to try to find a bad connection. OK
I looked in my 97 book and yes the only thing that controls the fan is
the ecm, it simply grounds the relays coil to close the connection fron
the fuse to the fan motor. The fuse and relay are under the hood in the
fuse box. 50A fuse. you need to figure out if its the ECM/wiring or the
fan/wiring first...good luck
When the Crown Vic overheated, I checked to see if the fan would come
on with the Air or Defrost on. It would not. I replaced the ECT
sensor and put in a new thermostat just to be safe. The fan now
appears to operate normally.
I did not expect the sensor to solve the problem. Why a bad ECT sensor
would prohibit the fan from coming on when air conditioning or defrost
is on is beyond my knowledge of wiring. I did order a Ford repair
manual so I could learn more about this and be better prepared for my
That burnt wire I referenced actually leads to the oil filter housing.
I'm assuming it is a oil pressure sensor. The wire has not completely
severed, so I will tackle this project next.
Thanks again for your help.
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