QuestionMy cousin have an hyundai elantra 2002 gls.fwd. at.he just replaced the radiator, the hoses get very hot andengine very hot also,is it possible the water pump resticting coolant flow,alsowhen ac.on battery eventually dies.this is in the carribbean.
AnswerFirst, I'm going to suggest you check the belt that drives the water pump and alternator. It may be loose and slipping. This can cause both the overheating issue and the battery issue.
If the belt tension is okay, then you'll want to audit the cooling system and check the alternator.
To audit the cooling system, first check the coolant level and check for leaks. Low coolant caused by leaks can cause overheating. Next, make sure the radiator is near full, remove the radiator cap, and start the engine. As the engine warms, you should see the coolant begin to flow in the radiator. If it begins to boil before it flows, you probably have a stuck closed thermostat. A short while after the coolant flows, the fans should begin to operate to manage the coolant temperature. If the coolant begins to boil after flowing but prior to the fans operating, you most likely have an issue somewhere in the fan circuits.
Since you report the battery dies under significant load, you'll need a load tester to test the alternator. Presuming you don't have this, if the battery is known to be in good condition, the problem is in all probability in the alternator. While not a common failure on Hyundais, one way alternators fail is that they cannot provide proper current to run all the vehicle's electrical devices.
