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Temperature gauge pegged hot at all times on or off even when cold

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You have a short in the wire or wires coming from temp sensor check for melted or broken bare wires

Posted on Apr 16, 2015

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Dec 01, 2015 | 2002 Acura RL 3.5

1 Answer

Temp gauge on 1986 s-10 blazer 4x4 2.8 stays pegged on hot. on or off doesn't matter. i have replaced sender and sensor. any ideas?


If you replaced everything back to the guage itself, then it has to be the guage itself. I would try getting a replacement instrument cluster at a salvage yard.

Aug 30, 2014 | 1986 Chevrolet S-10 Blazer

2 Answers

Turnsover but won't start on hot days


This is a tough one something like this should be handled with a diagnostic tool. Seeing that your temperature gauge is pined when the engine is cold, your temperature sender could be sending false readings back to the computer, although your engine is equipped with the separate temperature sender for the engine control module. I once repaired a problem with the ignition coil, it would fail when hot, and start working again when it cooled down. This solution is really shot in the dark, I would pick up a diagnostic reader, they're not that expensive. GOOD LUCK

Jul 02, 2014 | 1994 Chevrolet C1500

1 Answer

I had a water leak on my 1996 GMC K1500 and ran hot. Fixed problem truck running good, but the temperature gauge is pegged high even with a new sensor. How do I fix the gauge?


Pull off the negative battery cable and unplug the sensor. See if the gauge needle returns to normal. Try tapping on the cluster to unstick the needle. No luck? Replace the temperature gauge.

Oct 23, 2012 | Cars & Trucks

2 Answers

Temp gauge is very erratic from cold to peg hot. engine not hot


Sounds like the temp sending unit is faulty.....

Nov 10, 2010 | 2000 Ford Explorer

1 Answer

Temperature gauge


Find the temperture sensor on the engine and see if it is connected, if it is then test to see if its working properly if not then its probably defective and you have to replace it.

Apr 28, 2010 | 1998 Audi A4

1 Answer

Temp. gauge reads high some times. but the motor really isnt hot


It sounds like the coolant temperature sensor is beginning to fail. It is highly unlikely that the in-dash gauge is a problem. The coolant temp sensor inputs to the computer affecting everything from radiator fan speed, engine fuel/air calibration and a variety of other parameters.

Be absolutely certain to "burp" every bubble of atmosphere from the coolant system too. Air bubbles have the amazing ability to prevent coolant flow and will cause all sorts of problems, especially if the bubble wants to hang around the temperature sensor location.

Normal operating temperature is going to be around 210 F.

Most Autozone, Advance locations will read engine problem codes at no charge, so drop by one of those locations and let them read the problem code.

My guess will be the coolant temperature sensor. Then have the problem code reset, remove all air from the coolant and let us know how this worked.

Mar 11, 2010 | 2004 Chevrolet Impala

1 Answer

1995 GMC suburban temp guage pegs high, but heater


Sounds like there may be an air pocket in the system.
Try 'burping' the system. If this still doesn't fix the problem, check the temperature of the heater core hoses (in and out) The inlet should be fairly cool, the other should be piping hot. If they're both cold; the heater core has an internal blockage.

Next, replace the thermostat with a winter (180-195 F) derivative.
Bleed the system accordingly, and keep me posted!

Nov 30, 2009 | 1990 GMC C2500

1 Answer

Intermittant 1991 Corolla heater failure


remove heater core hose-jus 1, and blow air into it from an air compressor...WHATOUT for coolant,...ck'/flush/replace coolant--most the time this will work...try to buy only dealer or NAPA stats..kev-mn.

Dec 10, 2008 | 1997 Toyota Camry

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