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Re: 2005 Chevy Impala. Engine fan only kicks on when...
Believe it or not,230 is about where GM puts it. Claim the engine pollutes less at hot temps.
Fans should run with the AC on tho,mine runs cooler with the AC on .
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ALL tHAT IS NORMAL AND 200F STAT THE FAN KICKS IN AT 225F AND BOILS AT 265f THE DASH GAUGE IS ONLY TOY, BUT ONCE USED TO IT ,IT HAS MERIT.
ONLY a SCAN TOOL USING PID SCANS TO THE ECT TELLS THE TRUTH. OR LACKING AN IR THERMO GUN, TOOL.
MUST BE YOUR FIRST CAR AND CLUSTER WITH CHEAP GAUGES. NOTHING NEW THERE,
top cause of overheating, is THE THERMOSTAT NEVER LASTED 22 YEARS EVER. I'D NEVER RISK ANY GOOD ENGINE WITH SOME OLD STAT.
mark ask your dad if that gauge looks odd. even on hills the fans come on, 100% normal HOT DAYS, YES FOR SURE AT STOP SIGNALS , CAR STOPPED, SO FAN GOES ON. A/C ON yES UP HILLS YES. PULLING LOADS (TRAILER) OR TRUNK FULL OF BRICKS, YES. THE GAUGE MUST NOT MAX OUT AND PEG, OR CAUSE: ENGINE POWER TO DROP OR HEAR PING. OR CAUSE STEAM UNDER THE HOOD NOR COOLANT TO THE GROUND ASK DAD AGAIN,
Would turn the key on no need to start it and unplug the ect engine coolant temp sensor. If fans come on then suspect a faulty etc which may not turn on the engine light. Which engine is in the vehicle so I can help locate the ect which is usually by the thermostat housing.
If you have done this already,then bleed the cooling system,this is all you lack,just get the air out of the system,two bleed ports,one on the thermostat housing,and one on the engine near the water pump,just bleed them out as the car warms up,the thermostat bleeder last,if this was at all helpful,please rate,thank you.
YOUR ACTION IS REQUIRED:
If the engine is not really overheating and not low of coolant.
IF IT IS DO NOT CONTINUE TO RUN THIS VEHICLE.
RECOMENDATIONS: Sight unseen.
Replace the temperature sensor.
The Failed temperature sensor has a zero reading for the Control board, without this reading the car starts running in limp home mode or Default and assumes the engine is running hot, first thing to go is your comfort... The AC.
In addition starts the engine cooling fan to running full time.
The radiator and A/C condenser fans are triggered by high coolant temperature or when the A/C is turned on. Check to see if you have a relay sticking closed. The (ECT) engine coolant temp. sensor could also be defective telling the computer that he engine is too hot all the time. If you can locate the relay it's much like the others and you can swap it with a good one for a simple function check.
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