Changed the coolant already and the cap on the resvoir still runs hot...could it be the ECT sensor..or the fan relay...one more thing...when the gauge is past the half way mark...once I start moving the gauge goes back to the half way mark ...so I think that it is the fan relay
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code p 0442 refers to EVAP system so that is unlikely
check the fan operation and if you have a viscous fan hub ( fan clutch ) replace it
if you have electric fans , check coolant temperature sensor for operation , fuses , relay and fans
overheating is from low coolant levels , head gaskets/cracked heads, blocked radiator cores , fins flaking off core tubes, incorrect timing, blocked exhaust( cat converter)problem thermostat, over loading /over speeding, overdrive not engaging
if you over heating is predominately at lights , slow moving traffic or high engine rpms with low speed --check the fan operation and if it is viscous fan hub driven --replace the hub or if electric fans have that circuit checked out
sound like thermostat sticking close.replace thermostat and radiator pressure cap.if already done.you could have faulty water pump.if engine overheating at long slow traffic line or setting at a stand still.the engine cooling fans should be running, check and see if cooling fans running if not,check cooling fans fuses and relays.if all is good,hot wire make sure coolings fans okay.if all is good,code scan vechicle for faulty engine coolant temperature sensor and ecm problems.you need a code scanner where you can check live data check see if coolant temperature sensor reading correctly if engine coolant temperature is 190 degrees the coolant sensor. the scanner suppose to show 190 degrees in temperature if not it reads 80 or 90 degrees the engine coolant temperature sensor is faulty need replacing.if all is good check engine oil if look like milk shake blow head gasket will cause over heating.to be on the safe side i would replace thermostat and radiator pressure cap first.to make sure engine coolant circulating through radiator and engine block.
FIRST OF ALL I WOULD REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP THEN CHECK SEE IF COOLING FAN RUNNING.WHILE CAR OVERHEATING. IF NOT CHECK COOLING FAN FUSE AND RELAY.IF ALL IS GOOD THE ENGINE COOLANT TEMPERATURE SENSOR COULD BE FAULTY.HOT WIRE SEE COOLANT FAN WORKS IF NOT, COOLING FAN MOTOR BAD NEED REPLACING.IF COOLING FAN MOTOR WORKING PROBLEM COULD BE IN FAN MOTOR WIRING OR PCM FAILED.
IF COOLANT FAN FUSE AND RELAY OKAY.HOT WIRE COOLANT FAN TO SEE IF FAN MOTOR OKAY.IF FAN MOTOR OKAY.THE ENGINE COOLANT TEMPERATURE SENSOR MORE LIKELY BAD.THE ENGINE COOLANT SENSOR WHEN ENGINE COOLANT GETS HOT IT CAUSES ENGINE COOLANT TEMPERATURE RESISTANCE TO DECREASE CAUSE COMPLETE CIRCUIT IN WHICH POWER FROM PCM TO ECT SENSOR WILL SENT POWER TO COOLANT FAN RELAY THEN CAUSE COOLANT FAN TO TURN ON. HAVE ECT SENSOR OR ENGINE COOLANT TEMPERATURE SENSOR CHECK USING CODE SCANNER TO MAKE SURE ITS WORKING BEFORE SPENDING EXCESS MONEY.
CHECK FOR LOW COOLANT LEVEL AND REPLACE THERMOSTAT AND THE RADIATOR PRESSURE CAP.IF CAR OVERHEATING AND COOLING FAN NOT WORKING.CHECK COOLANT FAN FUSE AND RELAY.IF BOTH OKAY,HOT WIRE COOLANT FAN,IF FAN WORKS, PROBLEM COULD BE FAULTY COOLANT TEMPERATURE SENSOR,OR FAULTY PCM, IF COOLING FAN DONT WORK WHEN YOU HOT WIRE FAN.THE COOLING FAN ASSEMBLY NEED REPLACING.
CHECK ENGINE COOLANT LEVEL.IF OKAY.CHECK BOTH RADIATOR HOSES BOTH SHOULD BE HOT. IF THERMOSTAT TOP HOSE NOT HOT YOU HAVE A FAULTY THERMOSTAT AND RADIATOR PRESSURE CAP IF RADIATOR HOSES HOT AND THERMOSTAT OKAY.IF ENGINE OVERHEATING WHILE CAR SITTING IN A LONG TRAFFIC LINE COOLANT FANS NOT RUNNING.THE COOLANT TEMPERATURE SENSOR IS BAD OR YOU HAVE FAULTY FUSE OR RELAY.THE FAN MOTOR DEFECTIVE, WIRES AT MOTOR HAS A SHORT OR PCM FAILURE DEAD DRIVE CIRCUIT TO FAN.