So I had to replace my L36 a few months back. Had a shop swap it out. Runs great. After about a month the company I bought the engine from sent me 2 cooling system conditioner pills. Now my coolant looks dirty and despite my 180* tstat, she reaches 201* .The other day my dic said coolant level low./popped the Hood and overflow tank is at full hot. Get home and let her cool down, open the radiator and its a little low. Any ideas?