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#1
08-09-2003, 07:32 AM
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False hot temp reading on dash display.
 I have a 1992 s-10 blazer, 4.3 engine, z code. I got a dash display that has started showing 260 deg temp reading. The thermostst is working, 195 degrees. The engine is not overheated. I changed the temp senser in the intake manifold beside the thermostat. Started the engine the first time and let run for 5 min or so. Temp 150 or so. Shut it off, picked up tools, washed hands and was going to make a test run. When I started it that time, the temp showed above 200 degrees, and soon climbed to 260 degrees. I got a thermometer and checked fluid and it was 140 deg. After an extended run time I get the fluid to approx 195-200 degrees with a thermometer. The dash still reads 260 degrees. I have disconnected the battery to maybe reset system, etc. still no change. Is there another senser that I do not know about, or does the computer need to be reset somehow? Thanks in advance. 
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#2
08-09-2003, 07:43 AM
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Did the sensor you replaced have 2 wires going to it? If so, that was the temp sensor for the ECM.
Look on the left (drivers side) head between the spark plugs for a single wire sensor ( the one with the mushroom head is the knock sensor thats not it) If I remember right, it should be near # 1 cylinder....thats the coolant sensor for the temp guage.
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#3
08-09-2003, 07:51 AM
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The one I replaced had an oval socket with 2 prongs.
I assumed being that one was in fluid, that was for the dash. I know the small blocks had theirs on the left head near the front by the exaust port. This sounds like a similar location. I did not know there was more than 1 for temp. Thanks.
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#4
08-11-2003, 09:05 AM
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The parts store called this one a switch. They say the senser controls the computer (first one replaced).
The switch controls the dash indicator. Mine was on the right side head between cylinders 2 and 4. When I ask for a temp senser the first time, they gave me that item. The next time another clerk with more experience knew to look for another item, a switch. Seems techinical but thats life. Thanks for all the help.
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