Why would a 1999 toyota tacoma truck be running hot if the water in the radiator is fine and so is the oil.?

Thermostat is the first point of call. May also involve blocked radiator, coolant pipes collapsed internally, electric fan not coming on as it should, water pump . . .





Definitely go for the 'stat first though, it's most often the cause of that sort of problem.Why would a 1999 toyota tacoma truck be running hot if the water in the radiator is fine and so is the oil.?
feel both the top and the bottom radiator hoses the both should be hot if the lower hose is cool or only warm your thermostat is bad. if they are both hot turn on the a/c this will activate your radiator fan if it doesn't run hot now it's your radiator fan thermo-switchWhy would a 1999 toyota tacoma truck be running hot if the water in the radiator is fine and so is the oil.?
1. thermostat


2. wrong ratio of water to coolant


3. water pump


4. bad head gasket


5. bad radiator cap


6. blockage in the radiator

sunshine