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Temperature gauge is constantly fluctuating. - 2000 Nissan Frontier

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  • 3 Answers

Sounds like the 'sender' is faulty

Posted on Jun 30, 2009


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: Temperature gauge fluctuates and the heater blows cold air

Sounds like the thermostat needs to be replaced. If you do the work yourself be sure the temp threshold is correct and the flow direction is correct when installed. Good luck to you

Posted on Oct 16, 2009

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SOURCE: temperature gauge fluctuating surges

That sounds like the classic symptoms of a cracked ECTS (temperature sensor). It is located on the head near the upper radiator hose and battery. You will see two wires (likely a yellow and a black) going to a small sensor hiding in a little cubby hole. If you pull off the connector (there are two points that if you squeeze it lets the connector come off) you will probably see that the connector is corroded because the plastic body of the original ECTS cracked and let a small amount of coolant into the connector. The ECTS is only about a $10-15 part, be sure to get the updated one with a brass body. Then the hard part is you will likely need to get a new connector, one of the best places for that is a junk yard, the temp sensor for the transmission and the air temperature sensor near the air filter use the same connector. When putting this in be sure to solder the connections and cover that with heat shrink tubing. There are video's from Richpin06A on youtube that will show you how if you have any doubts. The saturnfans forum is a great place for info too,

Posted on Nov 14, 2009

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SOURCE: temperature gauge is fluctuating while driving.

I'm thinking the coolnat level is low, and this might be caused by a bad head gasket - At least $800 to fix - sorry.

Posted on Dec 04, 2009

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SOURCE: Temperature gauge fluctuates

First of all you have a bad heater core that needs to be replaced. Second you may have a bad temperature sensor. Make sure the radiator if full of water

Posted on Jan 19, 2010

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Temperature gauge keeps fluctuating whats the cause

Fiats have a reputation for electrical/electronic problems as they age and even when they are not very old they can manage strange things that even sometimes defeat the dealers, though the same can be said of many modern vehicles. I used to look after a Ducato motorhome and fortunately didn't need to get involved with much electrical work - the only faults were caused by the coachbuilders rushing around and being careless and not by Fiat.

I am not sure if the temp gauge is driven by the engine management or is a traditional circuit but either way the temperature gauge is in effect a voltmeter of sorts. Assuming the gauge is ok, the reading will only fluctuate if the voltage in the circuit fluctuates and that could mean the supply voltage is fluctuating or the resistance of the ground path is fluctuating.

With the traditional circuit the gauge is supplied by an electronically stabilised voltage and the ground path resistance is varied by the engine coolant temperature sensor and fluctuations could be anything from a faulty instrument voltage regulator, through faulty wiring or connections to the temperature actually fluctuating.

If the gauge is driven by the engine management the same approximately applies but checking the circuit becomes much more complex due to the need for circuit diagrams and specialised test equipment, though these would not be needed just to check the security of the gauge in the printed circuit of the instrument panel.

Mar 18, 2017 | Fiat Cars & Trucks

3 Answers

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

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

1 Answer

The temperature gauge on my 2003 GMC Envoy points 3 marks more than hlaf,is this normal? if not ,what could be the porblem?

if the gauge runs at this point under normal driving conditions consider it to be normal for that gauge,temperature gauges vary from vehicle to vehicle, if it fluctuates too much you may have a problem but if it is constant there is no need to worry.....hope this helps.....cheers.

Jun 21, 2011 | 2003 GMC Envoy

1 Answer

Temperature gauge fluctuates

First of all you have a bad heater core that needs to be replaced. Second you may have a bad temperature sensor. Make sure the radiator if full of water

Jan 19, 2010 | 1995 Ford Taurus

1 Answer

The temperature gauge does not seem to reach full operating temperature. The thermostat has been replaced but the temperature gauge drops if I am on the level or going downhill. The appointed agent says...

it will drop when going down hill and no load on engine ,this is normal ,think the shunt resistor in the gauge could be playing up where by its allowing the gauge to fluctuate a bit too quick, but the old adage applies here if it works leave well alone .Whats the outside temperature ?? this will have a big effect as well ,even more so if its below zero outside ,these cars a massive rad in them .Best advice is polish it and treat leather seats with cream and a nice vac out and it will run perfectly and never go wrong ,just like my sovereign

Jan 02, 2010 | 2008 Jaguar X Type

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

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

3 Answers


did u bleed the motor and lett the air out of it if not it wont fill up even thow you think it is full it is not if you did not bleed the air out

Mar 22, 2009 | 1997 Honda Civic

1 Answer

1999 Pontiac Montana Overheating

sounds like you could have faulty gauges to meby check them out.... and yes its posible that its pluged

Dec 06, 2008 | 1999 Pontiac Montana

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