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Emperature gauge keeps bouncing around

Tiny
RIDAO
  • MEMBER
  • 1996 CHEVROLET SILVERADO
  • 14,900 MILES
The Temperature gauge on my 1996 silverado keeps bouncing around from all the way hot to normal operating range. When this first started I filled the radiator with coolant, Temp gauge keeps bouncing from all the way hot to normal operating range. When this first started I changed the thermostat, that did not fix the problem.

I went to the local parts store to get a temperature sending unit, but they said that there was not one listed for a 1996 silverado 5.7 four wheel drive. Where is the temperature sending unit located on this vehicle?
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Thursday, January 26th, 2012 AT 10:43 PM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
It shares a temp sensor with the computer. It sounds like there is air in the system, probably due to a leak but could be a blown head gasket also.
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Thursday, January 26th, 2012 AT 11:22 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Try checking the coolant temperature sensor-On left cylinder head, near No. 1 spark plug.
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Thursday, January 26th, 2012 AT 11:26 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Ras is right. There is a separate sender for the gauge in the side of that head and check the connection of the wire to the sender, engine vibration can make it short.
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Thursday, January 26th, 2012 AT 11:36 PM

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