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Car heats good just temperature gauge gives faulty readings

If I let car heat up for 5 minutes temperature reads 100 and in 10 minutes of heating up it reads 195 and so on. What's wrong? It gets hot but don't overheat.

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My 1996 honda accord doesnt heat up like it suppose to..unless its juss parked without any movement.. I drive it 2 miles away and it still doesnt heat up im concerned !! Any help ????

Thermostat stuck open?
Faulty temp sensor or gauge?
If heat comes out of the heater, engine thermostat is ok. That will isolate it to probably the temp sensor in the temp indication system (sensor & gauge).
The cooling system should be full. Temp sensors cannot read the engine temperature of steam or empty cooling galleries.

Dec 30, 2014 | Cars & Trucks

2 Answers


the temperature sender unit may be faulty , have the OBD codes read to confirm

Jul 08, 2014 | 2000 Volvo S40

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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.

Mar 09, 2014 | Acura CL Cars & Trucks

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Takes a long time for heat to start working

You need a new thermostat by the sounds of it, or the heater core is plugged.

Feb 08, 2014 | 2010 Dodge Journey

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2005 Buick rendezvous heater blowing cold and temperature gauge not working properly?

Faulty coolant temperature sensor and a faulty heater control valve.

Jan 14, 2012 | 2005 Buick Rendezvous

1 Answer

2000 Pontiac Grand AM little heat being produced.

1st thing to do is change the thermostat. It is either missing, or stuck open (you provide good info). This is why the car is not running at operating temp and why you have little heat. The no blower for settings 1-4 probably means a bad switch.

Dec 17, 2009 | Pontiac Grand Am Cars & Trucks

3 Answers

Temperature gauge not reading properly. reading to high but engine is not overheating .Already replace senceing unit.

How do you know the engine is not over heating,it may not give any visual symptoms.If for sure it is not overheating,then replace the gauge itself.

Oct 17, 2009 | Chevrolet 2500 Cars & Trucks

2 Answers

Car over heating. tempature gauge fluxuates

Your overheating problems can have several possible causes.
1) Airlock in heating system - solution - bleed air from cooling system. Method is dependent on make/model of vehicle
2) Radiator blocked - solution - drain and flush radiator
3) Failed waterpump - solution - fit new waterpump
4) Engine thermostat stuck in closed position - solution - fit new thermostat
5) Electric cooling fan (if fitted) failing to operate - solution - check fan, fan operating switch, all wiring and connectors
6) Not enough coolant in system - solution - check and top up to required level. Also check all hoses for sign of leakage.
7) Faulty temperature gauge giving incorrect reading

Jun 21, 2009 | 2001 Jaguar XJ8

1 Answer


First thing to check are the engine's thermostat. It should open around 190 degrees. Does your instrument panel have a coolant temperature gauge or just an idiot light? If the gauge is in the middle third of it's sweep, the thermostat is OK. If the gauge reads low, have the thermostat replaced.
The second item to check in in the HVAC box below the dashboard. If the Fresh air/Recirculate door will not shut, cold outside air is continually mixed, which will degrade heating.

Dec 23, 2008 | Mitsubishi Outlander Cars & Trucks

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