Undertermined coolant leak location

You may be having what was a common problem in Malibu engines. The intake manifolds can develop coolant leaks (usually externally), normally between 70k-100k miles. Sometimes the leak goes internal and into the engine oil. Run the engine and check the dipstick. If the oil seems overly full and/or is a foamy chocolate-milk-like consistency, then you have issues that must be repaired immediately to avoid serious engine damage.

Check closely at front thermostat area. numerous hose connections there and it is probably leaking there and running down the lifter valley out the back. Check heater hose connections at firewall also.
Good luck

1. External Leaks
You need to get the vehicle to a mechanic to check all flexible coolant hoses, hose connections, around the exterior of the water pump and the entire radiator. To do properly the vehicle also needs to be on a hoist. If there is an external leak you should find coolant dripping from the front of the car while the engine is idling and the cooling system is fully pressurized. However it depends how bad the leak is and it's location.

2. Internal Leak

If coolant is leaking into the engine this is a serious problem and needs to be identified by a competent mechanic. For example, if you have a blown head gasket coolant will blow into the engine and contaminate the engine oil. If you check the oil in the engine's sump it should be completely free from coolant contamination.
You should also check the coolant in the radiator for any signs of oil contamination. If there is coolant in the oil then there will also likely be engine oil which has blown into the engines coolant passages and then mixed with the coolant.
IF you can find traces of coolant in your engine oil (or oil in the coolant) the likely problem will be a blown head gasket and the head on the engine will need to be removed and inspected .

Blown head gaskets are usually a result of an owner allowing the engine to overheat as a result of low coolant level, failed water pump or faulty thermostat. Overheating can also cause major damage to the head on the engine.

check the upper rad hose to engine there is a plastic housing with a seal replace it

really this could be one of several issues, does the vehicle run Hot, are you having to fill the reservoir with water or coolant, there is a hose that runs from the cap (overflow hose) to the reservoir, in addition to the upper and lower hoses, finally the water pump. the water pump is equipped with weep holes, which allow fluid to weep out when the pump is bad. finally the thermostat, hopefully one of these can solve your issue, good luck!

the fluid has to be going somewhere. run the car so that the coolant gets flowing look very carefully all over under the hood. i dont know but if you ever get an antifreeze smell while in the car it may be your heater core.

Coolant level is low

Hello smeet3992: The transmission uses 5w-30 for tempretures up to 95 degreese in tempreture. Uses 15w-40 for all tempretures greater then 50 degreese. If you are in an area that has extreme fluctuation in tempretures I would use the 15w-4o engine oil. I also senrt a picture of where to check the oil at. Make sure you pull the right plug. The reverse idler pin has the same size bolt head.
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it could be leaking somewere else , get your cooling system pressure tested at a shop

Mi camioneta isuzu trooper 1995, tiene ese problema en el tablero me marca CHEKC TRANS y se pone como huevona, ya no corre mucho. Que significara eso?

Gracias por la respuesta!!