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Re: Coolant/Heater problems.
Can have a lower intake leak, and not have a chocolate condition in the oil, if it leaks externally, usually at the end of the lower intake under the throttle body......it will "pool" there in in the top of the engine....
Right now, it sounds like you have an air pocket, which is preventing flow through the heater core and causing the engine to overheat.....
The air pocket could be caused by a leaking intake gasket or a head gasket....
Can easily check if the heater core is blocked, by blowing thought the inlet(be careful of the antifreeze), with the outlet disconnected(the hose that was hot is the inlet, the hose that was not is the outlet).....
Do not use something like stop leak.....
The engine will not run rough if the coolant is not getting into the cylinders....for example, you could have a head gasket leak, that is real small, but there none the less.....parking the vehicle overnite, pressure might force a little coolant into a cylinder....when you start the vehicle, you might have a slight misfire in that cylinder at first, and then it clears up.....if it is a real bad leak, then yes it would be constant....
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