What it cause of overheating engine? my car is EL lancer model 96

You have a few options but there are some that will convert Regular ATF if you add the "FRICTION MODIFIER". The IMPORT Fluid will say it on the Bottle, If your Transmission is a CVT Transmission (you have the smaller engine), then you need to get to the dealer. But normally the Import will say the Proper Fluid on the Bottle.

running too lean on fuel will cause over heating of engine

Did you also change the thermostat while you were doing the rad? The thermostat is the most common cause of engine overheating, it should be changed every couple years whether it is acting up or not.

donde va el relay que mencionas amigo? me paso el mismo problema

Hello 281421 and thank you for asking your question, on Fixya.

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How to diagnose your overheating Chevrolet El Camino engine

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Thanks for the vote, and good luck!

2 years is not new...it might be the problem...
look and see if the head gasket is leaking oil...if so the you need to get that repaired...the oil might mix with the coolant and overheat the car...
good luck!

It should be either the thermostat or the water pump.The water pump will sometimes allow you to go about 25-30 miles before it overheats.The thermostat would likely be the cause if once the temperature guage starts going up,it kind of just keeps going and overheats.You need to avoid driving and overheating as much as possible due to very bad engine damage.Hopefully you have a second car.You can call a couple shops,they normally will give you a free opinion,just describe it with as much information as you can to get an accurate one.Also you can get free estimates unless you plan to self-repair.Good luck! Greg

• Replace the relay of the radiator fan that's one reason why your car is overheating.
  

I’m happy to assist further over the phone at https://www.6ya.com/expert/ramy_d9e7ebea3891f482

air pockets in the cooling system can cause this problem. idle engine with radiator cap removed for 10 -15 min. Do not let engine overheat and make sure coolant lvl is topped off. this should bleed all air from system.

all engine overheating is du to malfunctioning cooling parts or coponents in the engine or attached to engine or car ... first ck for leak , coolant or water leak , then ck if the thermostat open on time to let the waterpass trhu ck the cooling fans if they working propely and kick on time , ck for an cloged radiator that neded to be fluch up nicolas