Question about 1994 Honda Accord

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Temp gauge reads hot when cold

The temp gauge eads hot soon as you turn on the car replace temp sensor
with honda unit still reads hot could it bethe ash unit.if you unplug the wire
to the sensor the gauge goes to cold

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That wire you are unplugging is pinched and being shorted to ground ! You need to trace that wire until you find it . Also if anyone has done any repairs recently you may want to start looking in that area .

Posted on Jun 17, 2009

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1 Answer

Temp gauge not working


Year/make/model?? Possible temperature sending unit failure. If a single wire sensor, unplug and the guage should read cold. Directly ground the wire to the sensor and the gauge should read hot, indicating the gauge and wiring to it are operational. If this procedure is ok, suspect a temperature sending unit failure

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The temperature gauge goes up when car starts to HOT like its out of calibration. the engine is not overheating


check that the wire to the temp sender unit has not fallen off and is shorting out on the head/block. The power comes from the ignition switch through the gauge down to the sender unit and because the sender is a temperature controlled resistance unit the voltage is very low and so the gauge reads cold . as the temperature heats up , the resistance is decreased and so the voltage is increased though the gauge and the needle reads higher.. Hench if the gauge goes directly to hot on start up the wire is shorting out or the sender unit is faulty.

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2.2L Chevy Cavalier- temp gauge always redline, fan kicks on as soon as car starts but the car is not overheating. Temp sensor? Temp sending unit? Something else? Help!


check the that wire to the temp sender unit is not shorting out as it will read hot if it is remove the wire and if the gauge goes back to cold then replace the sender unit.

Jan 05, 2014 | Cars & Trucks

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I replaced my water pump in my 1999 gmc yukon my check gauge light stayed on and temp gauge stayed over to hot side. can i reset it?


Not exactly.
The check gauge warning light is on because the temp gauge is reading hot.
Does the temp gauge read hot as soon as you turn the key switch on, or not until the engine as run for a few minutes ?
If it reads hot without the engine being started, there may be a short in the wiring or the sensor may have failed.

Apr 19, 2013 | 1999 GMC Yukon

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My temp gauge in my 2000 galant reads hot as soon as the car is cut on. The car itself is not running hot, what could the problem be?


Check that the wire to the temp sender unit is not shorting out before the sensor As water temp rise so the resistance in the sender unit decreases and the current increases so a short would indicate hot water. REmove the wire and see it any thing happens and if it stays cool then, Replace the sender unit

Mar 07, 2013 | Cars & Trucks

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Temp gauge on 1994 mercedes c220 stopped working could it be fuse or what


Well, "Or What" would be the correct answer based on the choices given. Please read this article about fuses: Where's The Fuse?

You most likely have a problem with the Coolant Temperature Sensor. There are a couple of temp sensors. The one with the single green wire is the one for the gauge. If you disconnect the wire from the sensor, the gauge should read COLD. If you take a paper clip or small screwdriver and ground the green wire, the gauge should read HOT. If this works, then replace the sending unit. If the gauge stays COLD even when the wire is grounded, Then you need to check for an open circuit in the green wire between the sending unit (Sensor) and the insrument cluster. If the gauge reads HOT even with the sending unit unplugged, then check the green wire for a short to ground between the instrument cluster and the sending unit. If there is no problem with the wire - Not open or grounded, then the gauge itself is bad.

Apr 19, 2011 | Mercedes-Benz C-Class Cars & Trucks

1 Answer

1990 honda accord temp gauge above hot limit.


Hi there,

Firstly - DO NOT run engine, when guage reads hot, as this will cause costly damage to head gasket & alloy engine head.

The fact that guage takes 1min to read HOT, would confirm the guage IS working properly.

So, other components which are likely to cause hot readings (in this order) are:

- lack of coolant (or leakage somewhere): is there sufficient green coolant at the correct level? Top up mixture to correct level. Repair any leaks.

- collapsed radiator hose: when engine is cold, start engine, then quickly watch both upper & lower radiator hoses to see if either begins to flex inwards (collapse). Replace if either hose is collapsed.

- bad/incorrect thermostat rating : when replacing thermostats, you must ensure it is of the SAME temp rating (they all differ).

- Incorrect Temp sensor rating: the ratings of this sensor must be within manufacturer's spec's.

- bad waterpump: the engine relies on the waterpump to distribute the coolant throughout the entire system. If waterpump is faulty, coolant will not flow quick enough, causing overheating.

If you still believe all of the above components are OK, then have your cooling system "pressure tested". This test should be done, before looking further at other electrical components.

Cheers,

"if this has helped you in any way, please rate this solution"

Jan 27, 2010 | 1990 Honda Accord

2 Answers

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Switch ig. on, ground the sender unit wire for about 3 seconds see if the temp. gauge moves, if so change sender unit, if not then it is a faulty gauge reader.

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1 Answer

Temp gauge cold and then heat turns not so hot


make sure the antifreeze is full. if so, replace thermostat and refill

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