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The engine idle fluctuates the temp gauge always reads hot even on a cold start radiator is always hot

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Is it actually hot the radiator Imean. If so check thermostat ,coolant level,of both ok than faulty guage.

Posted on Oct 02, 2009


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Why does my temperature gauge keep going up and down

An accurate temperature gauge will always fluctuate because the temperature in the engine fluctuates.

Usually the only time this is really noticeable is when the engine has been working hard and suddenly has to wait at a junction or similar and the gauge can rise considerably.

You didn't mention by how much the gauge fluctuates?
As long as it remains approximately in the normal zone it is acceptable but if it climbs into the hot zone or falls into the cold zone it is not acceptable and the cause should be investigated as soon as possible.

May 02, 2016 | 2008 Peugeot 308 1.6

1 Answer

My 2004 buick rendezvous has no heat and the temp gauge fluctuates

Temp gauge fluctuates? From around 200 degrees and up, then back down? This is an air pocket. First check the reservoir for leaks, then check the hose from the reservoir to the radiator for leaks and if it is kinked. No kinks in this hose is important. When I purge these systems, I drive it till hot, then turn sharp circles both ways. In a parking lot. This seems to help purge the heater core. Then refill as necessary. I do this with any car that has the 3.4 or 3.1 engine.

Jan 29, 2015 | Buick Cars & Trucks

1 Answer

Engine coolant Temperature gauge fluctuates

Watch the temp gauge when the electric radiator fans come on. The temp sensor that controls when the fan comes on may be faulty.

Oct 11, 2012 | 2000 Pontiac Bonneville

2 Answers

1990 dodge dakota 2.5 over heats temp gauge erratic

For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----

temp gauge goes erratic?


Temperature gauge keeps fluctuating up and down close to red?


Car runs hot?
-----------All types of car overheating problems and troubleshooting?
Car freeze overnight and started overheating while driving? Overheats and heater blowing cold?


Car overheats and Air blows hot at idle?
----------Car engine Overheats and transmission starts slipping?

Temperature gauge does not move and no heat when heater is ON?


This details will help.Thanks.

Feb 07, 2012 | 1990 Dodge Dakota

1 Answer

I have a 2006 chevy colorado 5 cylinder and im having a problem with my engine temp. Last year i changed my t-stat. and ever sincve they replaced it, the engine temp keeps fluctuating. So recently i had...

The temperature you see on the dash board gauge is not necessarily the actual temperature of the coolant. The engine has a 'coolant sensor' which sends information to the electronic control unit (ECU /PCM) and there is a separate 'sender' which governs the gauge reading you see on the dash board. The sender usually has just one wire connected to the top of it. The sender is basically a heat dependent resistor and the temperature gauge simply reads this resistance. Sometimes corrosion in the electrical connector can inhibit the correct readings, so first disconnect the sender and inspect/clean the pin with a little wire wool. Now check the coolant. First put the interior heater on maximum heat. Run the engine up to working temperature and then squeeze all rubber hoses to help shift any trapped air. Top up the coolant if the level drops when air pockets have been shifted. The following sequence should occur when the engine is warming up. 1) When cold the engine has higher then normal revs. This is due to the coolant sensor (not sender) telling the ECU that the engine is cold and that the injectors should add more fuel to compensate for the cold condition of the engine. 2) Within about a minute the idle revs begin to drop as the coolant sensor detects the engine warming up 3) After about 5 minutes the thermostat should open. You can detect yourself this by feeling the top rubber radiator hose getting hot. 4) If you have an electric cooling fan on the radiator this should switch on about now. If you have a fan driven by a viscous clutch this will engage a little later. 5) after about 2 more minutes the face of the radiator should be becoming hot and the bottom rubber radiator return hose should become warm, then hot.
If you have an electric fan and it fails to come on then check the electric relay and fuse for it. Viscous clutch fans should always show some resistance when turned over by hand when the engine is off, if it spins freely then the clutch coupling is faulty and it will need to be replaced. A sign of faulty fan related over-heating is a car than runs at normal temperature when cruising on the freeway but overheats when standing at the lights; fan engagement is to compensate for the lack of air flow across the radiator core when the vehicle is stationary.
I hope the above helps

Jun 18, 2011 | 2006 Chevrolet Colorado

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

Fluctuating engine temp a/c sends out cold air intermittently

Here's the thing. The ECU will shut down AC if the engine temperature is too hot. If the coolant temperature sensor is malfunctioning (lying to the ECU) telling it that the temperature is hotter than it actually is, the computer will turn the AC OFF.

Sep 11, 2009 | Hyundai Motor 2003 Elantra

1 Answer

2004 Chevy Tahoe. Heater working only at higher speeds.

you have air trapped in the cooling system. A good indication is that one or both of your heater hoses going into the heater core are cold when they should be hot.
Park facing uphill, raise front of vehicle so radiator cap is higher than top of engine. (You want bubble to get to radiator and out the cap.)
Leave cap on but loose, so bubble can purge.
Turn heater on.
Fill radiator and reservoir with 50/50 mix of antifreeze.
Start engine and run at about 1500 roms until the engine warms up and thermostat opens.
You will know themostat opens when top radiator hose is hot indicating coolant is flowing.
Shut off engine.
Fill radiator and reservoir. Install cap.

please Rate as fixya if this works. good luck

Mar 04, 2009 | 1997 Chevrolet Tahoe

1 Answer

Intermitant temperature

Check to make sure your thermostat works right by monitoring the warming up of your engine. With a completely cold engine, start and run the engine for a few minutes, then put your hand on the top radiator hose to monitor if and when it gets warm as the thermostat opens more and more and note the gauge reading( if it works) the top radiator hose should be unbearably hot within 5-8 minutes. If the therm. opens right it should close right aswell, staying open a little while eventhough the radiator may have cooled may be what you are experiencing causing the rapid cooling and is nothing to worry about. The Hose should not get warm very soon after starting the engine. Regarding you gauge, lets take one step at a time, verify proper op. or the therm.

Jan 20, 2009 | 1986 Toyota 4Runner

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