Light comes on randomly when all is ok. coolant level is fine, engine not overheating. If light is on, I can tap plastic recovery bottle with rubber mallet and light goes off. Is the sensor replaceable and is it in the bottle or how can it be replaced?
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Since you replaced the pump, the coolant reservoir probably got empty during the process and sometimes the level sensor inside it tends to get stuck. Look at the reservoir and on the bottom of it there should be some wires coming out of it, that's where the level sensor is. Lightly tap it with a pair of pliers and it should come up therefor removing the low coolant light. Now for the overheating, turn on the car and let it come up to temp, open the hood and make sure your fans come on when they're suppose to. If the temp is going higher and the fans don't come on then you need to check the fan relays or the coolant sensor. Turn on the ac, the condenser fan should start up, see if that helps it cool down. If the radiator fan does not come on, unplug it and plug it straight to the battery to see if it turns on, if not, you need a new fan, if it works then like i said, relays, fuses, sensor. Oh, i almost forgot, replace the THERMOSTAT as well.
SOUND LIKE ENGINE OVERHEATING,CHECK COOLANT LEVEL MAKE SURE YOUR RADIATOR FULL OF ANTIFREEZE.IF YOUR COOLANT OVERFLOW JUG IS EMPTY COOLANT LEVEL IS LOW.NEED ADD MORE COOLANT TO OVERFLOW UNTIL COOLANT STAY AT FULL COLD MARK. DONT OVER FILL COOLANT OVER FLOW JUG.IF COOLANT OKAY ENGINE OVERHEATING REPLACE THERMOSTAT.MAKE SURE ENGINE COOLING FAN IS WORKING IF YOU COME TO A STOP CAR SITS FOR A LITTLE WHILE START OVERHEATING THE COOLING FAN NOT TURNING ON , BECAUSE COOLANT FAN FUSE BLOWED OR YOU HAVE BAD RELAY,THE ENGINE COOLANT TEMPERATURE SENSOR FAULTY.IF YOU HAVE THE CLUTCH TYPE COOLING FAN, MAKE SURE WHEN TURNING CLUTCH FAN WITH HAND COOLING FAN SHOULD HAVE RESISTANCE WHEN HOT.IF CLUTCH FAN FEEL WOBBLY AND LOOSE REPLACE IT.TAKE VECHICLE TO AUTO ZONE OR ADVANCE AUTO PARTS OR ANY AUTO PARTS STORES THEY WILL CODE SCAN CAR FREE AND GIVE YOU THE CHECK ENGINE LIGHT TROUBLE CODE TO SEE WHAT CAUSING CHECK ENGINE LIGHT TO TURN ON.
CAR OVERHEATING FIRST CHECK FOR LOW COOLANT IN THE RADIATOR COOLANT OVERFLOW JUG.IF COOLANT LEVEL IN OVERFLOW JUG LOW REFILL ADD COOLANT BACK TO THE FULL COLD MARK.PUT RADAITOR CAP ON COOLANT OVERFLOW JUG START ENGINE LET IT IDLE UNTIL IT OPERATING TEMPERATURE.MAKE SURE TOP RADIATOR HOSE GETTING HOT WHILE ENGINE WARM UP.IF TOP RADIATOR HOSE DONT GET HOT WHILE ENGINE IDLING YOUR THERMOSTAT COULD BE STUCK CLOSE CAUSING CAR TO OVERHEAT.IF TOP HOSE IS GETTING HOT.CHECK FOR COOLANT LEAKS CHECK TOP RADIATOR HOSE AND BOTTOM RADIATOR HOSE FOR LEAKS.CHECK FOR LEAKS AT THE RADIATOR CORES AND PLASTIC SIDE CONTAINERS.IF ALL IS GOOD ENGINE OVERHEATING WHILE IN A LONG TRAFFIC LINE, COOLANT FANS NOT COMING ON.COULD HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR BLOWN COOLING FAN FUSE OR RELAY.COULD HAVE PCM FAULT.MAKE COOLING FAN ELECTRICAL CONNECTORS AND WIRING NOT DAMAGE OR BROKEN.
sound like you have faulty low coolant level sensor in the coolant expansion tank.make sure coolant expansion tank has coolant should be on full hot mark when engine hot been driven.cold engine coolant level in expansion tank should be on full cold mark.
NO heat because there is no coolant flowing throught the heaster core. Car is overheat since there is no coolant circulating in engine water jacket.
Check the coolant, if it is low, then check the oil level. If oil level is high then the head gasket is blown so coolant gets into the engine therefore there is not enough coolant to cool the engine.
If the oil level is OK and coolant level is OK then Need to check 3 following things:
-Bad thermostat is not open causing coolant stagnant then engine overhet.
-Bad water pump is not pumping coolant so there is no coolant circulating to disipate the heat.
-Bad radiator blocks the coolant flow from top to bottom radiator.
If your coolant low light is on it usually means you need to add coolant to the plastic reservoir, but if the coolant level is ok in the reservoir but the light still stays on then the coolant level sensor in the reservoir is not functioning properly. The check service engine light can mean anything from serious engine problems to a simple oxygen sensor reading that the computer didn't like. You can stop by your local auto parts store and they will read the codes and tell you exactly why it is on and what the computer has detected.
I wonder why the overheating caused you to change the engine instead of checking with the cooling system. Some time back my 323i overheated and coolant expansion tank burst open, but that probably due to ignoring the coolant level low light for a couple of days. I replaced the coolant expansion tank, thermostat and few hoses connected with the tank and it worked fine for me.
Try to check you coolant level - may be you should have replaced your water pump and not the engine.