My estima is overheating,not sure if it is the head gasket or just the radiator,the temp drops when A/C and fan is on full,but still uses alot of water.checked to see if the oil was milky but it looked sweet,could do with a hand THANX.
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Re: overheating van help needed thanx
Is the water being lost out of your overflow or from somewhere else? Your water pump may need to be replaced if the water is coming from your pump. If the water is being lost from your overflow, even when you first start the car and drive it cold, it most likely is compression gas blowing past your head gasket. If you lose no water for the first few minutes of driving until the engine gets warm, then it may be venting from over heating from another problem and not your head gasket.
Check for leaks.
It's odd that the temperature drops when the A/C is on. Your electric fans should be running when the A/C is on and when the water temperature rises. Check your fans when the engine is hot and the A/C is off. Also make sure the cooling system is full when you do this or a thermal switch may not sense the hot temperature. If your fans don't run, it could be a bad fan or switch. Turn on the A/C. Both fans should be running.
Check for debris/blockage of your radiator. If the "fins" are smashed or matted, the radiator won't funcion properly. You can try to "comb" them straight or replace it. Also check for evidence of sludge within your radiator.
Try replacing your thermostat. It is most likely no good anyway since it's been exposed to several overheatings and could possibly be the original culprit of your problem.
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You may have a blown head gasket. 1st check to see if your coolant level is good, if it isnt make sure you top it off, run it for 20 minutes watching the temp. and putting the heater control to full hot to be sure you bleed out all the air that may be in the system, after 20 min or when the temp rises too hight turn it off, let it cool, open and top off as needed, repeat after topping off, do this till it no longer takes any more coolant and is no longer overheating. If your still overheating and slowly losing coolant you more than likely have a blown head gasket, they have a sniffer test you can do at the radiator cap your local parts store carries them or your local mechanic can run the test.
OVERHEATING CAN BE CAUSE BY MANY THINGS LIKE FAULTY THERMOSTAT AND FAULTY RADIATOR PRESSURE CAP,TOO MUCH WATER IN COOLANT SYSTEM NEED 50 / 50 WATER AND ANTIFREEZE.LOOK FOR WATER PUMP WEEP HOLE LEAK, IF COOLANT LEAKING OUT WEEP HOLE WATER PUMP BAD NEED REPLACING.CHECK FOR LOW COOLANT LEVEL, YOUR RADIATOR OVERFLOW JUG SHOULD HAVE COOLANT AT THE FULL COLD MARK IF NOT KEEP ADDING COOLANT INTO COOLANT OVERFLOW JUG UNTIL COOLANT STOP DROPPING AND FULL COLD MARK, IF OVERFLOW COOLANT JUG WAS EMPTY RADIATOR IS LOW ON COOLANT.WHICH CAUSE AIR IN COOLANT SYSTEM KEEPING THE ENGINE COOLANT TEMPERATURE SENSOR FROM BEING SUBMERGE IN HOT COOLANT WHICH TURN ON THE COOLANT FANS.WHEN ENGINE COOLANT TEMPERATURE GET CERTAIN SET TEMPERATURE LIKE 190 DEGREES THE PCM AND COOLANT SENSOR WILL TURN ON COOLANT FANS, IF VECHICLE OVERHEATING COOLANT FANS NOT WORKING EITHER YOU HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR CHECK COOLANT FANS FUSE AND RELAYS. YOU CAN CODE SCAN CAR TO SEE IF YOU HAVE FAULTY PCM, FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR FAULTY COOLANT FAN RELAY.IF COOLANT FAN AND ENGINE COOLANT TEMPERATURE SENSOR OKAY,YOU HAVE CORRECT COOLANT LEVEL IN COOLANT SYSTEM, THERMOSTAT AND RADIATOR PRESSURE CAP BEEN REPLACED, YOU COULD HAVE BLOWN HEAD GASKET CHECK ENGINE OIL LOOKS LIKE MILK SHAKE HEAD GASKET BLOWED ALSO WHEN HEAD GASKET BLOWED YOU CAN DRIVE CAR SHORT DISTANCE START OVERHEATING AND YOU LOOSE ENGINE POWER SUSPECT BLOWED HEAD GASKET.
1st make sure the radiator is full/// check the cap make sure the seal is good no cracks
2nd make sure the fan comes on/// when the engine is up to temp the fan will come on
3rd make sure the thermostat is working/// watch to make sure the water is circulating
if the radiator is full and the fan doesn't come on you need a temp censor switch if full and fan comes on you might have a blown head gasket or cracked head
I think you missed checking a couple of things more.
1.- Water Pump
2.- Temp. Sensor
3.- Radiator Fan
5.- Spark Plugs
6.- Spark Plug Wires
7.- Vacumm Leaks
8.- Fuel system (Pump pressure, injectors, leaks)
9.- Electrical System
10.- Check for even compression on all cilinders.
Could be head,or head gasket blown.But change the thermostat and check to see if the cooling fan comes on after it warms up.Be sure not to have ac on.Watch the temp.be sure the fan starts and runs good,and then it goes off by itself.If the fan does not come on,then check for a blown cooling fan fuse,or a bad cooling fan relay.Be sure the cooling system is full,and has no air in the cooling system.Coolant sensor could be bad also(this is what tells the ecm to turn on the relay that controls the fan.When the radiator is full,and the engine is cool,or cold,start the engine with the radiator cap off,and look to see if coolant gushes out of the radiator while the car runs.If ti does,head,or head gasket is blown.
the radiator fan switch which drives the fan relay,needs to have hot coolant to operate properly,the temperature sending unit the same situation.you either have a thermostat that is stuck open,or alot of air circulating in the system.pressurize the system to 15 psi and see if it drops,if it does...you have a leak in it.my suggestion would be to fix the radiator properly.overheating that engine is going to result in needing a head gasket which is expensive.find a good used radiator.
Yes this has happened to me. The coolant temperature sensor tells the radiator fan when to turn on to cool the radiator. When this sensor is faulty your vehicle is overheating and it can cause a blown head gasket if not replaced. I hope this was helpful.
First when vehicle is cold like in the morning check and make sure that the vehicle has enough coolant/ antifreeze in radiator and reservoir. If coolant is need use a 50/50 mixture of water and antifreeze. You will need some time to do this let car run at idle until the temp guage is in the middle NOT+ normal operating temperature. At this point if the thermostat should be in the open position. Let vehicle run and check to make sure that radiator fan comes on. This should come on when guage is about midway/half way. If temperature rises above half going to h/hot and fan doesn't come on, you either have a BAD FAN BAD FAN SWITCH BAD FAN RELAY OR BLOWN FAN SWITCH FUSE. You will need to check all of the following I will help if its needed. If fan comes on and doesn't go off and vehicle continues to get hot even with fan running. Feel radiator hoses and see if the lower radiator hose is cool/cold. If it is you have thermostat that stuck closed. Replace thermostat and fix problem. If all the above is good and vehicle continues to over heat. THE BAD NEW IS THAT YOU MAY HAVE A BLOWN HEAD GASKET /CRACKED HEAD /BROKEN WATER JACKET. Basically you will need a HEAD JOB at least a head gasket. ONe tell tail sign of this is oil looking like milkshake/chocolate milk-a creamish while residue in oil or antifreeze. Contact if you need hel0p. Good Luck and thanks for using FIX YA