Lower Temp Sensor
09-02-2010, 03:38 PM
#1
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Lower Temp Sensor
Hey all. I saw that in my 2000 A4 1.8T that there was another temp sensor at the bottom drivers side on the radiator. What is that sensor for? Thanks.
09-02-2010, 04:27 PM
#2
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There is one sensor in the coolant flange on the back of the block ("green" top sensor) as well as one near the bottom of the radiator. They provide the temp to the ECU that provides the signal to open the thermostat. If your thermostat never opens, the water around the block never gets to the radiator thus no circulation and the car will simply overheat.
09-03-2010, 05:15 AM
#3
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There is one sensor in the coolant flange on the back of the block ("green" top sensor) as well as one near the bottom of the radiator. They provide the temp to the ECU that provides the signal to open the thermostat. If your thermostat never opens, the water around the block never gets to the radiator thus no circulation and the car will simply overheat.
The one in the lower radiator is not a sensor at all, but a thermo-switch to control the two speed electric fan.
09-03-2010, 05:30 AM
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. Nothing worse than providing bad info 
. Next time. I'll make sure to find more than one source to be sure what I give out is right.Have a good one.
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