03 navigator engine coolant temperature problem
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From: south gate
03 navigator engine coolant temperature problem
hello fellow members this is my 1st post and in need of help i have a 03 navigator 5.4 3v im getting a check engine light code p0117 i changed thermostat and 2 sensors one in back of pass hed and the other one next to the themostat . cooling gauge goes half way and then it just dies auto zone gave me this sensor part number # SU8781 its lite brown with 2 wire clip i been looking and just cant find nothing 
thx for ur help in advance
thx for ur help in advance
Logistics Pro
Joined: Jan 2001
Posts: 3,740
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From: Central NYS
I'm not sure changing the thermostat will fix your check engine light. The P0117 is the computers way of telling you that the voltage on the ECT (Engine Coolant Temperature) sensor circuit was too low (i.e, less than 0.2V) for normal operation. That would indicate a temp of over 250 degrees F. Did your Navigator overheat at some time?
Sounds like you changed both the CHT (Cylinder Head Temperature) sensor as well as the ECT (Engine Coolant Temperture) sensor.
Could you elaborate on what you mean that it 'just dies'?
Did auto zone say what kind of a sensor it was?
Could you elaborate on what you mean that it 'just dies'?
Did auto zone say what kind of a sensor it was?
Carpenter Local 745
Joined: Apr 2006
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From: on da beach
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Duralast/Oil Temperature Switch (SU8781) | AutoZone.com
What was the other switch's part number?
Also, did you disconnect the negative battery cable before
Replacing switches/sensors?
Duralast/Oil Temperature Switch (SU8781) | AutoZone.com
What was the other switch's part number?
Also, did you disconnect the negative battery cable before
Replacing switches/sensors?
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From: south gate
Thread Starter
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New User
Joined: Jan 2011
Posts: 4
Likes: 0
From: south gate
thats the sensor they gave me and from what i heard from my friend that coolant sensor goes inside the oil pan and from what i been googling the cooling sensor 2 wire harnest gets messt up thx guy for all ur help
Logistics Pro
Joined: Jan 2001
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From: Central NYS
Are you sure its a 3-valve engine? What is the eighth digit of the VIN?
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Logistics Pro
Joined: Jan 2001
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From: Central NYS
The Navigator runs three different networks to support communication between the various electronic modules. All three networks are accessable through the DLC. I think your gonna need a scan tool that can read U codes to see if you are having an issue with network communications and/or run a self test on the HEC to see if it is having issues controling the virtual temp gauge.
I'm afraid that this is beyond my pay grade
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