I don't think that the 93 has a cooler at all, but Icould be mistaken. If it does, I think it is only on inside the radiator side tank.
My 94 has the cooler inside the radiator followed by its own little auxiliary cooler. The stock cooling on my car works pretty well now that it has been flushed several times.
I am, however, consider a new LPD cooler in place of the stock aux cooler and t-fittings...