Hi there,
There will be no connection between the heater core problem and the A/C, you will have a leak in the A/C system, often they are quite small and are hard to find, so what you do is get a small charge of refrigerant with a leak detector dye added, the dye will stain with a very bright colour where it is leaking, this will usually only take a day or so to work, try this.
Mark (mhpautos)
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Thursday, December 4th, 2008 AT 3:23 AM