Question about 2000 Chevrolet Malibu

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When I put on a/c temp.needle fluctuates. When a/c is not on the needle stays dead center on the gauge. Loosing anti freeze, but on consistently.

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I had this same problem.if you are losing antifreeze you might want to check your oil to see if its in there.i just changed the lower intake gasket because it was leaking into the oil.

Posted on Jul 04, 2009

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Took the car to a chevy dealer to check causes.

Posted on Jun 25, 2009

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Temp gauge says hot. anti-freeze is full.no leaking head gasket and motor stays cold after running


Bad step motor in the instrument cluster that controls the temp gauge . The best way to check it would be with a professional type scan tool that can view sensor data parameters . You first need to know how that gauge gets the info to set the correct temp . There is a coolant temp sensor located in a coolant passage on the engine . This sensor is a input to the PCM - engine computer . The PCM needs this info fuel managment , the PCM also sends this info. to the instrument cluster over the Class 2 data network ! There is a microprocessor inside the I/C that deciphers these message bits an uses the step motor to control the gauge needle ! Aren't computers great ?
How to repair GM Instrument Cluster Speedometer Gauge Stepper
This guy says 03 to 06 , i have seen gauge's on earlier models go out too . You could by a used cluster on eBay or at a automotive salvage yard or junk yard , what ever you know them by . $20 buck's at salvage yard , more on eBay .

Apr 26, 2017 | Cars & Trucks

3 Answers

Why does temperature gauge only reach a little past half?


Larry, If the cooling system was not bled properly, the temperature could fluctuate up to 3/4 then normally back down to 1/8 on temp gage.
If your gage is just staying a little over half when running, that is actually normal and acceptable.

Mar 23, 2016 | 2000 Buick Century

1 Answer

2005 chevy equinox. The needle on the temp gauge is normally steady but from time to time swings back and forth from hot to cold and then normal, it also shows a code of p1245. What could be wrong??


The code P1245 is for the Intake Plenum Switchover Valve.

This probably has nothing to do with the gauge fluctuations. The gauge problem is probably one of three possibilities:

  1. Low coolant level in the system. When coolant levels get low, air moves thru the system and when it reaches the temp sensor, will cause fluctuations.
  2. Defective coolant sensor. These can fail over time as do all sensors.
  3. Defective gauge in the dashboard.

Nov 12, 2015 | Cars & Trucks

1 Answer

Temp guage needle fluctuates a lot and other times it's fime. Sometimes I smell a little anti-freeze


if you smell antifreeze inside the car . you heater core could have a hole or is leaking....check the floorboard on passenger side for wetness....that is a sure sign

Aug 12, 2015 | Cars & Trucks

1 Answer

2004 pacifica won't stay running. temp gauges are erratic. No code on PCM


The PCM on a 2004 Ford Mustang is a combined control unit, consisting of the engine control unit (also known as an ECU) and the transmission control unit.------------------------------------------------------------------------------------------
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Mar 07, 2013 | Chrysler Pacifica Cars & Trucks

2 Answers

No heat , antifreez leak not visable...


A car this new should have a warranty right? the only other place for anti-freeze to go is through a blown headgasket into your oil. Pull out your oil dipstick and make sure it is not milky in color. If not check behind the engine and see if any coolant lines going into the firewall are leaking. When inside the car do you smell steaming coolant(anti-freeze) or hear gurgling? The temp gauge that stays on is the overheat indicator?

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xxsodasipperxx@yahoo.com

Dec 14, 2009 | 1998 Chevrolet Malibu

2 Answers

Temperature gauge fluctuates and the heater blows cold air


Definitely check your fluid level in your radiator. Top it off all the way. I've seen that happen multiple times on cars that were low on anti-freeze. If that doesn't work try replacing your thermostat. It's cheap and the easiest place to start if topping off the fluid doesn't get you fixed up.

Oct 16, 2009 | 1997 Chevrolet Camaro

1 Answer

Why does my temp gauge fluctuate when i drive in town but stays level on the highway


When on the highway the wind blown through the grille naturally cools the rad coolant. While stuck in traffic the radiator fan will intermittantly cut in to prevent over heating, thus the fluctuations in the temp. gauge.

Aug 03, 2009 | 2001 Dodge Stratus

1 Answer

Temperature needle jumps.


check the connector at the temp gauge sending unit, it may be corroded, engine movement causes the connection to make and break and this gives the fluctuation in the needle of the gauge..

Apr 28, 2009 | 1990 Nissan Stanza

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