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Temperature gauge faulty on toyota tazz 1300 . I have replaced the temperature sender unit, the thermastate and the fan relay but still no joy !

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Pls check the fuse

Posted on Jul 19, 2009


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2002 dodge diesel Temperature gauge not working,have changed Coolant temperature sensor, still not working

possibly change the wrong unit
gauges work from a sender unit not a sensor
it is located next to the thermostat housing normally and has only 1 wire connection
they work by having power through the gauge to the sender through variable resistance that is affected by heat to ground
test disconnect the wire from the sender
turn on the ignition key , ground out the wire and the gauge should go straight to full hot
sensors on the other hand have more wires and relay the coolant temp to the ECM so that air/fuel ratios can be adjusted , and fans switched on as required

Oct 12, 2016 | Dodge Cars & Trucks

1 Answer

Im having probs Vauxhall astra 1.6 11 plate cooling fan on all the time

the fan power is controlled at the last point by a relay
that relay gets the signal from the ECM which relies on the coolant temperature sensor to report on coolant temperature and the need to cool it down
If there is a problem in that relay ( points burnt together then the fan will run continuously as the power is direct from the battery
first fix is too replace that relay with a known good one and if it still runs then you will have to trace back each component and fuse until you find the faulty unit
It could possibly be a faulty coolant SENSOR ( don't confuse with a coolant sender which works the gauge)

Aug 11, 2015 | Vauxhall Cars & Trucks

1 Answer

How to get the temperature accurate. My toyota tazz 130 2006 model problem is that when I switch the key in on position, the temperature gauge rise to maximum point eventhough it is cold.

you might have two temperature sensors one turn the fan on the other is called the temperature gauge sending unit if not check your gauge

Jan 21, 2015 | Toyota Cars & Trucks

1 Answer

Cooling fan wont turn on

you are expecting the wrong temperature unit to control the fan. The temperature sender unit controls the temperature gauge and the temperature sensor unit controls the fan operation. It allows current to go to the ECM and when a pre set temperature is reached the ECM activates a relay and the fan starts . Two completely different units to do two different jobs so if it is doing what you say then there is a possibility that the wires are crossed or shorted.

Jun 20, 2014 | 1993 Dodge Spirit

2 Answers

Radiator fans will not cut on and cool the engine

check fuses and relay for the fan . Replace the coolant temperature sensor ( not the temperature gauge sender unit)

Mar 23, 2014 | 1992 Acura Legend

1 Answer

Cooling fan will not turn off

This sounds like the temperature sender unit in the engine is faulty, and sending a hot signal all the time.

Dec 15, 2013 | Toyota Camry Cars & Trucks

2 Answers


I would check the fan first, run a hot wire to one side of the plug, if you unplug the fan you must ground one side. if fan works, then next check the fan relay. only other thing it could be is the temperature censer on the engine block, should be close to the upper radiator hose

(Thermostat) side, this works on a ground bases. Hope this helps you!!!

May 17, 2011 | 1994 Toyota Camry

1 Answer

My temperature guage is not working. But the radiator fan working fine. It is because of a faulty temperature swithc. Vehicle Tyota Corsa 1996 model.

The fan switch and the temperature gauge are not related in any way. Look for the temperature sender unit which should be located on the cylinder head near the thermostat (it looks a bit like a small spark plug). Start off by replacing that as it is the most likely item to fail.

May 10, 2011 | 1994 Toyota Tercel

1 Answer

My truck is over heating, i have changed the thremostat and the radiator. I dont know if i burbed it corectly. Im at a stand still. it has good flow so the water pump is good.

Firstly check that the engine is actually over heating, you may have a faulty water temperature sender unit.
Also check your gauge is ok, disconnect the water temp sender wire and the gauge should either go to hard hot or cold. If neither happens your gauge is faulty.
Let me know how you get on.
Also check your fans are coming on to cool the radiator, if the engine is getting to over half way on the temperature gauge and the fans are not coming on then you have a faulty coolant fan sensor.
Replace this and you should be ok after that.

Mar 01, 2011 | Chevrolet 1500 Cars & Trucks

2 Answers

My 94 Tracer temperature gauge reads between 3/4 and 7/8 in the normal range before the radiator fan turns on. I have already replaced the fan temperature switch and the relay. Could my temperature...

Yes, it is possible the temp. sender is faulty, but I would do a cross check of the actual coolant temperature vs gauge reading using a cooking thermometer in the top of the radiator.
Take care not to get scalded - check it at about 180 to 200 deg.

Aug 02, 2009 | 1994 Mercury Tracer

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