I have a 2001 626 Mazda v6 and just change the themostat and its running hot what shall I do?

You must remove the transmission pan and replace the filter inside attached to the valve body. Refill to just under the full line, run engine until transmission fluid is hot and then top off the transmission fluid, DO NOT OVERFILL!!

change the themostat
and clear code with computer

The cooling fan motor is bad,replace,it's by the fan,remove electrical connector,then remove part.

G'day
Check your coolant levels (when the vehicle is cold) also your oil level and make sure the fins in your radiator are not blocked with dust or debris.

Vehicle:
1999 Mercury Cougar Engine: V6 2.5 Liter V6 2.5 Liter FI Regular Thermostat: 180 Degree; Alternate Temperature

check the coolant, make sure it is full, and it is not over aged. if it is, check the themostat.

The thermostat is located on the front left of the motor facing the radiator(Almost directly below the radiator cap). The lower radiator hose is attached to the thermostat housing.

actually, i would recommend o do both. change the thermostat and flush the entire coolant system. this is best.

BAD HEAD GASKET.....

try removing themostat and see if temp improves make sure themostat is fitted the wright way not upside down