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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over heating will probably be the cause of most problems as it sends the ECM crazy with so many sensors inputting information
If you have a viscous fan hub then replace it as it is the prime cause of overheating .have a compression test done to check head gasket and cracks
If you have electric fans make sure that they are working
ckeck coolant level at the radiator cap
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.
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.
The engine temp drops because the fan turns on regardless of heat or a/c. During summer of course with warmer weather it will be at a steady temp unless you the gets overheated by radiator or blown head gasket
YOUR WATER PUMP COULD BE BAD.CHECK TO SEE IF WEEP HOLE LEAKING IS SO REPLACE IT IF NOT.MAKE SURE COOLANT FAN IS WORKING.HAVE RADIATOR SHOP PRESSURIZE COOLANT SYSTEM.TO CHECK FOR LEAKING HEAD GASKET.ALSO HAVE RADIATOR SHOP FLUSH RADIATOR.IF ITS CLOGGED UP.IT WILL CAUSE OVERHEATING PROBLEMS.ALSO MAKE SURE YOUR ENGINE COOLANT MIXTURE 50% WATER 50% ANTIFREEZE.TOO MUCH WATER IN RADIATOR WILL CAUSE OVERHEATING.
You could have several issues here. A blockage in the radiator, bad coolant temp sensor, (not turning the cooling fan on) a bad cooling fan motor. sounds as if maybe one of these may be your primary issue, and the cause of the overheating that originally caused your head gasket problem. Hope this helps
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