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Message: <blockquote data-quote="RickS250" data-source="post: 41016" data-attributes="member: 4978"><p>SORRY right up front! Do yourself a favor and DO NOT blast air into a heater core! The coolant system is no more then 16 PSI and even if you have both ends open you could get more then that in the core! I have a Radiator shop and I would take both hoses off the motor and flush with a garden hose both ways, it would be better if you could use hot water! Run the water into a bucket just to see what you get out it might shock you what comes out. You don't want to flush it back into the motor either or your just fighting yourself later. Maybe its time to flush the complete coolant system. But like someone said check your coolant level first and make sure that it's full then see if there is good air flow also. I'm GUESSING that the heater core is going to be alum fins with copper tube and if I'm right and its by your feet the alum fins might be getting bad and falling out or just plugs tight. Like I said before SORRY but I have seem heater cores radiators and oil coolers that people have tried to clean/flush that were junk after they were done.</p></blockquote><p></p>