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Temp gage not working on 93 gmc sierra - 1993 GMC Sierra K1500

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Try changing the sending unit.

Posted on Oct 06, 2009

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Posted on Jan 02, 2017

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1994 GMC C1500 Sierra, 5.7 liter, 2WD. Replacing a one-lead ECT sensor with a two-lead??


Your engine coolant temp sensor is a two wire sensor.
The temp sending unit for temp gage is a different animal, one wire connector.
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The fuel level gage sending unit is defective, very common problem. The sending unit comes with a new fuel pump and is referred to as a module, also make darn sure you replace the fuel pump connector at the fuel tank, solder and shrink tube the new connector on, DO NOT USE CRIMP CONNECTORS.

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1 Answer

I replaced the water pump, thermostat and radiator cap and the temperature gage is jumping up to about 230 and then it cools down to about 200 why is this happening? My truck is a 1995 GMC Sierra


This is happening because you got it right!! It is perfectly normal for the temp gage to indicate those readings. Here's why...

The thermostat has to be heated to its set point, say 195 degree's, before it will open. While it is doing that the engine temperature sensor is "upstream" and it takes a little longer for the thermostat to react. The old thermostat may have had a lower set point or was just weak.

Perfectly normal, nothing to worry about.

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1 Answer

Cluster problem,transmation temp gage ,engine temp gage not working but in info message center flashing other problem like battery voltage flashing but working gage no high beem indecater only sometimes...


This sounds like a few problems, the first thing i would is to have the computer scanned for any storeed codes, have the engine computer and body computer checked then scan the cluster for any problems, these trcks had a few problems with the cluster and the throtlebody just to name a few things, start with the scanning then maybe replace the cluster, on most of these newwer trucks the replacement cluster must be program to truck inorder for the truck to run correctly and cluster to operate correctly. hope this is helpful also check with your dealer for any recalls on this cluster problem you may be able to get free repairs.

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Check water temps, ,and water thermostat,and sending unit! A cold engine will cause poor performance.

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THERMOSTAT REPLACE IF NOT SEE IF HOSES ARE CLOGGED SHOT OF AIR COULD HELP OR DISSCONNECT BATTERY CABLE 10-15 MIN CONNECT BACK TRY HEATER

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