What are the possible reasons that cause a car to over heat?

Question

change head gasket- didn't work
change sensors
Change radiator
change water pump
Does timing has anything to do with over heating?

Answer 1

timing can do it,but first check your thermostat,and flush out your cooling system.

Answer 2

Remove, inspect, clean and regap or replace spark plugs. Ensure that the ignition points are correctly set. Make sure the rotor cap is unburnt and the distributor cap is clean, uncracked and not carboned up between the electrodes.

The timing is easy to set on older cars, but on newer ones it might not be quite so easy to do. On older cars the spark plug fires when the points open. Remove the distributor cap and maybe loosen a few spark plugs to make the engine easier to turn by hand. Rotate till the timing marks match, the rotor cap should be pointing to the position of the no 1 spark plug cable.

Connect a 12 volt trouble light clip to the positive lead of the condenser and the other clip to a good ground. Turn on the ignition. When the points are closed the light should be either out or very dim because the points when closed short out the trouble light. As soon as they start to open the light will become brighter. Adjust the distributor using the vernier, or by rotating it until the light just brightens. Your timing is now set as well as with any strobe.

If the car has a vacuum advance, suck on the vacuum tube to be sure it works. Check that the centrifugal advance mechanism below the points is free. If it is a bit stiff lubricate with a minimum of oil.

If the timing is off it can cause overheating but if you have replaced the head gasket I'd imagine that the timing would have been re-set after replacing the head. So that's probably not it.

That leaves thermostat, accumulated muck in the engine, bad fan, and from there we get a bit more "exotic". You can check the thermostat by putting it in a pan of water on the stove. If it begins to open by about 70 centigrade, (that's around 150F) and is fully open before the water boils it is OK. If the radiator hoses are old and soft they may collapse under the flow of water through them and restrict flow through the system, or they may have ragged insides which are doing the same.

With the engine off and cold, try to move the fan blades back and forward. If this is easy the viscous clutch is worn out and must be replaced. If there is an electric fan make sure that it is running under all conditions. Some have two or three speeds and only one of the speeds may be working.

Get some cooling system cleaner fom the parts store and use it according to instructions. Make sure it's compatible with alloy engines or heads if you have an alloy engine or head.

Another cause is a blocked exhaust system. If the car has long been used for short trips the exhaust system can be choked by carbon or rust. You may have to replace a muffler or resonator.

Check that brakes are not dragging. Does the car overheat only when the air conditioning is on? Is the automatic transmission efficient, presuming it's automatic?

There is always the possibility that the temperature gauge is telling you lies. That's about all I can think of just now. Hope it's been of some use.

Answer 3

must be a lot of stuff. First, verify if there is any water interior the radiator. If no longer positioned some in it. Use 0.5 anti freeze and nil.5 water . that is that it in simple terms desires water. Afterwards run the engine and look under the automobile and spot if water is leaking onto the floor(brush aside any you will have spilled on the same time as refilling) If water retains spilling then Its a burst water hose possibly. If it would not leak onto the floor and nevertheless over heats its a foul thermostat (challenge-free restoration) or the water pump. If the engine cools initially yet then starts overheating lower back word if there is any steam coming off the engine. If there is it quite is leaking someplace. must be one among your radiator strains, a cracked radiator or a heater hose. do no longer run the engine on the same time as warm it is going to crack the top gasket or the top itself which equates to an extremely costly fix bill or a want for a clean automobile as yours would be ******. you may tell if this has occurred because of fact steam will blow out of your exhaust pipe on the same time as working the engine.

Answer 4

Thermostat may be sticking and not opening up allowing the water to circulate in the engine. You could also have problems with the fan motor if it is so equipped, or a loose belt if the fan is belt driven. My best guess is Thermostat. You do not say when the overheat occurs. If you could describe what happens and when with an edit to your question, it may be easier to make a better guess as to what is goinf on with your car.

Answer 5

most likely you need to have your radiator rodded out. it has the lines clogged and the water isnt circulating enough to cool the water. also the clutch fan could be wore out. is it a electric fan or manual ifso take and spin the blades on the fan if its really free then its your clutvh fan. looking at around 60 bucks for one. radiator rodding is around the same good luck.

Answer 6

you changed the head gasket, but it could be the head itself that is causing the problem, also if the catalytic converter is stopped up, it could cause the overheating

Answer 7

have you changed the thermostat. it controls flow of coolant if it is clogged or not opening properly it will do it. I sure hope that isn't it after all that it only costs about 10 bucks.

Answer 8

Thermostat problems or leaking radiator itself or
hoses.ceck the top and bottom hoses. Good luck!

Answer 9

You never mentioned whether or not you checked your coolant level. I'm not trying to be Captain Obvious but that's usually where the problem is, the most obvious things.

Answer 10

You didn't change the thermostat in the radiator, nor in the head.
Timing can have something to do with it.