Walmart in Canada does not sell 134a coolant. In this forum, someone mentioned about coolant he bought from Walmart that had coolant, oil and stopleak in the same can. Where can I buy a small can in Toronto to top off the coolant in my 850 GLE. My compressor is short-cycling going on and off every 6 seconds on park position. I would like to try and see if its a slow leak and how long a can would last for one month since winter is almost here anyways.