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Alternator light on and coolant temp hot! - Cars & Trucks

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Check your belts.

year, make, model, and engine size?

Posted on Feb 16, 2012

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The coolant light flashes on but the temp gauge does'nt go past the middle when the car is running


YOUR TEMP GAGE WILL NOT REGISTER CORRECTLY WHEN THE COOLANT FALLS BELOW A CERTAIN LEVEL. WHEN IT IS SMOKING IT IS EXTREMELY HOT. IF YOU HAVE A COOLANT LEAK THAT BAD IT SHOULD BE NOTICEABLE EVEN WHEN IT IS NOT HOT. YOU NEED TO FIND THE SOURCE OF THE COOLANT LEAK. WATER PUMP, COOLANT HOSE, FREEZE PLUG, HEAD GASKET, RADIATOR CAP LEAK, OR RADIATOR, OR HEATER CORE. CHECK THE ABOVE AND YOU WILL FIND THE SOURCE OF THE LEAK.

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Temp gauge says hot(goes all the way to left by gas gauge)little bit of coolant under car once in a while but then coolant will be low-There is no white smoke.Doesn't heat or cool well.heater core has...


the coolant could be just overflow,, as far as the temp,, replace the thermostat as a first thing, when your car gets that hot, it causes readings to be sent to the computer that sends mixed signals to other parts of the car, The first thing you should do is pull the diagnostic codes. This will tell you if the thermostat is dead.check the temp sending unit, it is located under the upper radiator hose, 19mm wrench will take it off, it costs about 20 bucks but you also need to replace the thermostat. all in all its about 25 bucks total and all your gauges work fine....

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97 saturn sl2 temp light flashing and low coolant light flashing what could be the problem ? coolant is full and the heat works.


If the temp gauge is reading normal, the lights are flashing, and the coolant level is full, the level sensor in the coolant bottle is the problem. I'm a service consultant for a Saturn dealer and I've run across this many times.

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1995 Saturn 4door singlehead cam


The coolant temp sensor probably cracked and reading wrong. On drivers side of head. The lower one, with 2 wires going to it.

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