Question about Chevrolet Malibu
Your heater core has no idea if coo or hot water is passing through it. Either it flows or it doesn't. Run the engine till it is at normal operating temp with the cap removed and the front end jacked up on the corner where the fill is. After it reaches operating temp, turn it off, wait about three minutes and start it again. Turn the heater on high. Add coolant till it's full and let it run. It may overflow a little a few times but should not overheat.Make sure that you are adding a 50/50 mix as straight antifreeze will boil at a lower temp than does water. If you have any bleed ports on the engine you can open them if necessary. If the radiator is flowing properly everything should return to normal.
A partially obstructed radiator can appear to flow normally as the coolant goes around the restricted passageways. turning the heat on will never cause an engine to overheat even if it was totally plugged. Be sure there are no external obstructions as well (bugs or leaves packed into the A/C condenser or between the condenser and the radiator. It is sometimes possible for a head gasket to allow compression gasses to enter the cooling system. it will first fill the heater core, then push water out of the cylinder head passages. You can have a hydrocarbon test done at any shop to find out if this is happening. Your original problem was an overheat. Even if it was due to another problem, it can cause a gasket to fail or a cylinder head to warp or crack.
Try what I said and if that fails have the test done.
Posted on Feb 04, 2010
Clog in the heating manifold.
Posted on Feb 04, 2010
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Posted on Jan 02, 2017
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