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Old 18 Dec 2010, 05:01 am
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Default GSR Temp Gauge goes all the way to Hot Instantly!!?

heres what happend...i just swapped a integra gsr motor into my rs and i finished the swapp and then poured in all the tranny and motor oil filled it up, then i poured in all the antifreeze then closed everything and turned the car on let it warm up for like 20 min since i had not started the engine for like a month, then i drove it carefully to a gas station like 2 miles away since it didnt have gas, it was all good the only problem was that the car was idleing from like 2k to 2.5k repeatedly, then i drove it back home and i noticed the temp gauge slowly going to the H so when i got home it was like 3/4 to the Hot/overheating area so i turned it off

then the next day i decided to check the car and i turned it on and it went straight to H instanly so i turned it off and from there now i dont even have to turn the car on i just open the switch and it will go all the way to the H..what can be the problem ??
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Old 18 Dec 2010, 05:16 am
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Temp gauge sensor is bad or there is a short circuit.
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Old 18 Dec 2010, 05:31 am
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Posts: 181

temp censor is going direct to earth if this happens ! check for a faulty wire touching earth !
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Old 18 Dec 2010, 05:46 am
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Posts: 1,338

The coolant temperature gauge is controlled by the

CPU built-in the gauge assembly. The CPU

receives coolant temperature information from the

ECM/PCM via the multiplex control unit. The

ECM/PCM receives coolant temperature

information from the ECT sensor.

The ECT is a thermistor which means that the resistance in the sensor decreases as engine temperature increases. This returns a greater relative voltage to the gauge cluster and the higher the voltage signal the higher the temperture that is displayed on the gauge.

the first question is now that time has passed, does the gauge still read Hot?

on some cars, the gauge will remain at the last position it was in when the car was shut off. If you didn't start the car when you checked it afterwards then start the engine and see what the gauge reading is.

if the reading is cold to normal when started then the problem you have is that the car is overheating. From your description the most likely cause would be a radiator fan that isn't working.

if the gauge reads hot immediately upon starting the car then the temp sensor would likely be the problem as it would be returning too high a voltage. this could happen if the sensor were good and you had air trapped in the cooling system, so bleed the cooling system before you replace the sensor.

the way you bleed the coolant system is to remove the coolant overflow jug and hang it from the underside of the hood. leave the rubber hose between the overflow jug and the radiator connected.

fill the jug halfway with a mixture of coolant and water.

start and run the engine until the thermostat opens. the level of coolant in the jug should drop. run the engine for 5 minutes then shut it off, reinstall the coolant jug and correct the level in the reservoir.

Sounds to me like you are dealing with an overheating problem rather than a gauge problem.

particularly if the gauge worked before your engine swap.

hope that helps
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