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I would not use stop leak. It would be possible that it would plug you radiator or even your heater core. It is also possible that it would introduce a corrosive chemical that could lead to leaks that would only be repaired by replacement. However, if your leak is minor, and you said it was cold out, it is possible that you have a hose clamp that has started to leak as the ambient temp has dropped. I understand not wanting to repair in the cold, I live in Minnesota. Keep a jug of 50/50 coolant with you in case the fluid gets too low, a warped head and blown head gasket would really stink if you overheat, besides leaving you stranded. Good luck.
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