1993 Mazda b2200

Engine Cooling problem
1993 Mazda b2200 4 cyl Two Wheel Drive Manual 79834 miles

I changed my thermostat, changed the fluid and it still runs extremely hot. A friend of mine said that there was probably air in the cooling system and I should look for a " burp" valve. I have been unable to locate the valve. Any idea where the burp valve is? Any other suggestions? Thanks a lot
July 21, 2008.

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