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Cooling System Discussions regarding radiators, water pumps, T-stats, hoses, etc...

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Old 09-23-2011, 01:38 AM
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coolant temperature sensor

I just replaced the temperature sensor on my 99 Lesabre because it was reading low at the dash while the coolant temperature was normal (190F). I verified that the dash guage was fine by installing the specified resistances across the connector. The dash meter gave expected readings with the specified resistors, so the meter is fine. I got a new sensor and the meter does read higher, but not near the specified readings. Does anyone else have this trouble? It's more of an annoyance than anything, but it would be nice to have a more accurate temperature reading on the dash. Right now it will read about 160 when it's really 190.
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Old 09-27-2011, 02:37 AM
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Quote:
Originally Posted by enslow View Post
I just replaced the temperature sensor on my 99 Lesabre because it was reading low at the dash while the coolant temperature was normal (190F). I verified that the dash guage was fine by installing the specified resistances across the connector. The dash meter gave expected readings with the specified resistors, so the meter is fine. I got a new sensor and the meter does read higher, but not near the specified readings. Does anyone else have this trouble? It's more of an annoyance than anything, but it would be nice to have a more accurate temperature reading on the dash. Right now it will read about 160 when it's really 190.
Which temperature Sender did you get?
I got the SMP TX66, I'll look at my dash readings vs scan tool readings once I get the car running, and see if I notice what you are noticing.
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Old 09-27-2011, 10:30 AM
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I'll have to check my GM bill.

After looking at my electrical schematics, it looks like the computer and dash use the same sensor, which puzzles me further. The computer returns normal and expected temperatures. The guage returns low temperatures. However when I use the specified resistances at the sensor end of the connector, the guage reads low, medium, and high as expected by the diagnostic test.
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Old 09-27-2011, 12:34 PM
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If it helps you any, I get a decent variance between my DIC and my mech gauge under pretty much all conditions.
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Old 09-27-2011, 06:54 PM
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OK, I'm gonna grumble here a littlle...

Even Ford can get a decent temperature guage. Mind you they use two sensors.

I'm going to do another test one day. I'll use the specified resistances on the connector end of the temperature sensor, look at the guage, and use the scantool to read the temperature. I'll also use the ohmmeter to measure the resistance of the temperature sensor on a warm engine, hopefully using my VOM and not my fingers to measure temperature!
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Old 10-14-2011, 03:51 PM
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factory dash is never right. Remember these cars were built by greedy assh0les with old pieces of left over 1980s buicks and some mobile home sheet metal.
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Old 10-17-2011, 11:20 PM
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It tells the computer what temperature your engine coolant is ... support for the fuel to cut the calculations of cold starts, and if the thermostat is working properly. It can also be used in other systems, like heating and air conditioning.




___________________________________________
Ford Parts - Standard Coolant Temperature Sensor
Blade terminal type; A high quality direct fit OE
replacement temperature sensor.
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Old 10-21-2011, 05:06 PM
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When I got my car running today I notice my temp on my dash gauge is all of the way up, and I mean ALL the way, but the scanner is reporting the coolant temps correctly.
If it is driven till I can figure it out is this going to hurt anything?
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Old 10-22-2011, 03:45 AM
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In your own thread on your issue you said that the computer reports a normal temperature. I wouldn't worry about what your dash says right now. I did post in your thread Temp Gauge on Dash a test you should try first.

As I stated before (I think), I tested my ECT in the following manner:

1) disconnect the ECT
2) connect resistances 1400, 93, and 55 ohms in turn and observe guage
3) guage should read min, mid, and max temperature.

This tested out just fine. 1400 ohms is for 40C, and the min in the guage is 40C. 93 ohms is for 120C, and the exact mid positon is 120C. Likewise for the max. Anything that would increase the resistance would, in fact, lower the temperature. Any corrosion on the terminals could account for this.

What I didn't realize before is that although the computer and guage use the same thermistor, they use different pins. The computer uses pins A and B so that it has it's own ground. The guage uses the threads as a ground. I used teflon tape on the threads, and I don't believe I left any threads with no teflon. The teflon could be causing an increased resistance to ground which would lower my temperature reading some what. Because the computer uses its own ground, the temperature reading is normal. I'll have to jumper the thermistor to ground somehow and see if the guage readings return to normal.

The installation instructions for the ECT did say to use a thread sealant. I'll bet teflon doesn't allow enough metal contact for a good sensor ground. I'll bet anything I've found the problem!
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