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Re: Engine light is on.
When the check engine light comes on the dash, the computer stores a trouble code(DTC). The computer would need to be scanned to get the code. This code will indicate what system is having a problem. Many of the large parts store chains will do this for free.
A coolant leak can be from any nunmber of sources. A pressure test would need to be done.
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It is never recommended to drive a car that is leaking coolant. However, if the leak is small, and you keep close tabs on the coolant levels to avoid running low on coolant, you can drive for short periods of time until repairs can be implemented. Obviously, larger leaks may make this impossible. Also, remember to keep the proper ration of anti-freeze to water in the coolant when you top off. Even if it is not winter, the engine parts need the anti-freeze to prevent corrosion and to lubricate the water pump. Going with straight water, or an overly diluted mixture will cause more problems for you down the road.
Could be time for a new van. The oil light is warning the driver engine oil pressure has dropped below 10 psi, not necessarily that the engine is low on oil. Common causes for low oil pressure is a faulty oil pump or screen, or worn engine parts. The fact you are also adding coolant and you don't see any external leaks sounds like the engine is reaching the end of its life.
If it's from the front of the engine, the water pump may have failed. Check for water coming out from the bottom of the pump. Was the overheating caused by low coolant level? If not the pump, check your engine freeze plugs and hoses.
If there are no coolant leaks then check your engine oil to be sure it is not over full or foamy because if there is coolant getting into the oil it will cause irreversible damage to the engine. If the engine has ever over heated the head gasket/s could also be leaking and will need replaced.
The check engine light may be from a low coolant condition. the green fluid inside the car is probably from the heater core that is leaking. so you should check the coolant level and you will have to verify the leak.
The coolant sensor liight come on when the Anti-freeze get low. Just top off the ant-freeze and the light will go out. It is norrmal for anti-freeze level to go down but slow. Toping off once or twice a year is ok but anymore then that you really should check for leaks. Low anti-freeze will cause over heating. Over heating can wreak an engine.
A car this new should have a warranty right? the only other place for anti-freeze to go is through a blown headgasket into your oil. Pull out your oil dipstick and make sure it is not milky in color. If not check behind the engine and see if any coolant lines going into the firewall are leaking. When inside the car do you smell steaming coolant(anti-freeze) or hear gurgling? The temp gauge that stays on is the overheat indicator?
Firsdt check the radiator cap thats it tight , then check for any anti freeze visible on the engine, then check under the car for any leaks. Is the smell of anti freeze inside the car ? , check the heater core you may have a leak there. the newer heater cores are aluminum and certain anti freezes, are extra acidic , which causes the anti freeze to eat at the heater core causing leaks, it maybe be a pin hole leak in the heater core ,causing the smell.
U need to use 50/50 mixture of long life/extendedlife coolant availible from any automotive parts store for around $8 per gallon. but you must have a leak, check for coolant leaking when the car is running, don't overheat this engine or u will blow the cylinder head gasket, a $1000.00 repair.