Re: 94 merc black max150 new impeller and still no water
Did you check the intakes for obstructions from the previous impeller? If the old one was shredded it is possible that bits worked up into the cooling system. More details on your motor would be helpful. On my V-6, the thermostats are in the top of the heads on both banks. ALso you may have a problem with your poppet valve.