Just replaced the heater core in my 2000 Durango 5.9. The advice from this forum was great. A LOT of work, but went pretty smooth thanks to all the pictures. When I disconnected the AC lines and removed the condenser there was a neon colored leak detector in the system. Now for the question, I did install a new condenser but was wondering if that leak detector will gum up the AC system without the oil and Freon in there too? I am not sure how effective it is having the system recharged this time of year or if it would be OK to wait till spring and warmer temps to recharge it. Any thoughts or input would be appreciated.