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Could this be a Temp. sending unit?

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Old Aug 4, 2016 | 10:59 PM
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Default Could this be a Temp. sending unit?
LT1 engine.A/C works nine,car runs great.When I paper clip a & b ports both fans come on.Car never over heats,hardly ever over 200.
After car sits over nite engine cold.When I drive with AC off when engine reaches 180-195 AC cooling fan comes on and service engine lite comes on.
After car sits over nite engine cold. When I drive with AC on,blowing ice cold.AC cooling fan on from the get go.As soon as temp shows anywhere from 180-195 service engine lite comes on.
Does this sound like a bad Temp. sending unit causing the service engine lite to come on?
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Old Aug 4, 2016 | 11:29 PM
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Sounds like you need a scanner to see why the CEL came on.
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Old Aug 5, 2016 | 01:50 AM
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Originally Posted by tony58
After car sits over nite engine cold.When I drive with AC off when engine reaches 180-195 AC cooling fan comes on and service engine lite comes on.
Need to pull those codes. Fans shouldn't cause a CEL.

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Old Aug 5, 2016 | 11:25 AM
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Just a shot in the dark, but seems your fans are coming on at too low of a temperature. Do you have a custom tune on the ECM that could be causing your issues? What year is it?
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Old Aug 5, 2016 | 11:42 AM
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Originally Posted by JimLentz
Just a shot in the dark, but seems your fans are coming on at too low of a temperature. Do you have a custom tune on the ECM that could be causing your issues? What year is it?


If his avatar is authentic, its a 96
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Old Aug 5, 2016 | 12:15 PM
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Sounds to me like something happens when it goes into closed loop
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Old Aug 5, 2016 | 01:22 PM
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Originally Posted by JimLentz
Just a shot in the dark, but seems your fans are coming on at too low of a temperature. Do you have a custom tune on the ECM that could be causing your issues? What year is it?
Its a 1992.No custom tune.
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Old Aug 5, 2016 | 01:28 PM
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Originally Posted by JrRifleCoach


If his avatar is authentic, its a 96
Got two,92&96.Got to fix this lite from coming on,probably sell the 92.Wanting to get a 2017 Grand Sport.
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Old Aug 5, 2016 | 01:33 PM
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Originally Posted by tony58
Its a 1992.No custom tune.
Strange, as on my '92 the fans don't turn on until after 220 and the first time it happened I thought something was wrong with the car coming from a C3.
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Old Aug 5, 2016 | 02:30 PM
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When we say it comes on at a given temperature that is too low or high, I like to see what the temperature is as reported by the sensor and scan the sensor with an infrared thermometer.
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Old Aug 5, 2016 | 09:11 PM
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Originally Posted by JimLentz
Strange, as on my '92 the fans don't turn on until after 220 and the first time it happened I thought something was wrong with the car coming from a C3.
I thought the one on the drivers side,comes on when the AC is turned on?
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