Take off the fan clutch, see the wound spring on the front of it? Unhook the spring from the retaining clip, spin it 180 degrees COUNTERCLOCKWISE and lock it back to the other clip on the opposite side. This will make it "always on". You fan clutch should roar now and pull a lot of air. If it doesn't, replace it.

Don't put a 160 thermostat in it. It will accomplish nothing.

If this doesn't help, ditch the closed cooling system and get a new radiator for an open system. What kind of radiator do you have? If stock specification - junk it. Get an all aluminum radiator on ebay. You want 2 row with 1" tubes. I paid 169 for mine - shipped. Make sure you get all the brown out of the cooling system before you throw your new radiator in.


Peace

Mafundzalo