Having problems with your 1996 GMC Sonoma ?

My 96 gmc sanoma v6 engine is low on anti freeze.Every time i put antifreeze into the fill tank it drinks it up to where it gets down to a half gallon.There is no external leak anwhere,dry at bottom end and there is no drip on the ground.Could the head gaskets be leaking?.The truck runs fine but is thirsty foy coolant.Any help will be appeciated.

Posted / edited by AnonymousUser on : 20-05-2019

Answers :

If you pull out your oil dip stick and it has a milky light brown color then you have a bad head gasket.Also if you over fill the expansion tank it will flow out of the overfill hose.There should be a mark on the side of the expansion tank for the coolant level.Also it could be that you have a bad intake gasket.In order to check that I recommend that you take it to your local repair shop for that diagnosis
Does your oil look normal? If it has a milky look that means coolant is getting into it somewhere. Do you notice more than normal steam or white smoke coming from the exhaust? Those are signs of a head gasket leak or an intake manifold leak. Do you notice the smell of coolant when you open the hood? They are notorious for have intake manifold leaks. There is also a heater hose fitting on the intake manifold that is notorious for leaking. I would test the cooling system with a pressure tester. You may be able to rent one. They are simple to use. Just remove your radiator cap and install the tester and them pump it up to the PSI listed on your rad cap. Let it sit and look for leaks. Pay special attention to the intake manifold, water pump, all hoses and radiator. Are you noticing anything inside the cab like the windows always fogging up or puddles on the floor. That could be a sign of a bad heater core. Pump it up and let it sit for a while and watch to see if the pressure drops or you see a leak. You may have to start it after a while as sometimes water pumps will leak when running and not when off.
Repair Help & Product Troubleshooting for 1996 GMC Sonoma

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