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Toyota Service
Toyota Service, Toyota Expert
Category: Toyota
Satisfied Customers: 4944
Experience:  30+ Yrs of auto experience, Award Winning Svc. Manager; Just Answer Customer's Choice Award Winner
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1999 Toyota tundra 4 cylinder runs hot ..changed radiator,

Customer Question

1999 Toyota tundra 4 cylinder runs hot ..changed radiator, water pump, thermostat, heat sending unit and fan clutch where do I need to look next?
Submitted: 2 years ago.
Category: Toyota
Expert:  Toyota Service replied 2 years ago.

Hello,. Welcome to Just Answer. you are saying a 1999 Tundra 4 cylinder?

Customer: replied 2 years ago.
Expert:  Toyota Service replied 2 years ago.

Is this an American truck? Toyota did not produce a 4 cylinder Tundra

Customer: replied 2 years ago.
Sorry! I meant Tacoma! This is the wife ha
Expert:  Toyota Service replied 2 years ago.

Ah. Ok. No worries then. How long did it run hot before any of the parts were replaced?

Customer: replied 2 years ago.
When my husband first noticed it running hot he flushed the radiator and changed thermostat. Radiator was clean. Then he changed the heat sending unit and fan clutch still running almost to red
Expert:  Toyota Service replied 2 years ago.

IS he using genuine Toyota red coolant mixed 50% coolant and 50% water?

Customer: replied 2 years ago.
he is
Customer: replied 2 years ago.
Radiator and water pump is only 1 year old
Expert:  Toyota Service replied 2 years ago.

Assuming he does not have an air pocket in the system, which would prevent the coolant to circulate, he may have a seepage at the head gasket. Is he there? We need to check something. If the engine has ran in the last few moments, he needs to feel the inside face of the radiator (with the engine OFF, of course.) Is the radiator COLDER at the bottom of the radiator than the much hotter top half?

Customer: replied 2 years ago.
sending him to check it..
Expert:  Toyota Service replied 2 years ago.

ok

Customer: replied 2 years ago.
not much difference he said
Expert:  Toyota Service replied 2 years ago.

He might want to take this truck to a shop where they can do a test to see if the cylinder head gasket is leaking compression into the cooling system. If thsi is so, this leakage will slow the flow of the coolant down and cause the engine to overheat.

Expert:  Toyota Service replied 2 years ago.

Overheat conditions can and will cause a head gasket issue