3URFE overheating issues

[88sogreatv8]

I know this is a forum for the uz family, but im stumped atm on an over heating issue. I have a 2017 tundra 5.7L , bought new maintained well having an issue with it overheating. At first it was very intermittent and random. I initatialy thought it was a sensor issue so , i swapped the temp sensor with a oem sensor from toyota.

The issue was still there, so i swapped the radiator cap , also OEM. Issue was still there. So i changed the thermostat. This one i used a murry from O'reilly. Now the issue seems worse. The temp will start to climb all the way as high normally as 250 degrees , then just as quick at climbed it falls back to normal. I dont trust the aftermarket thermostat , so i ordered a OEM one to test the waters , so we will see.

However, my opinion is it will not fix it even with a stock thermostat. Has anyone had this issue? Im going to check the clutch fan to see if it is going out. It did seem loud this winter, but maybe im just paranoid. I also checked to see if the water pump is leaking. It looks dry. I havnt found any common TSB's on overheating, or recalls .

If anyone has and information , or has experienced anything like this the help would be much appreciated

 

[P Bateman]

First, check to see if the front of the radiator is blocked. It won't cost you anything.
Second, is the coolant in good condition, no corrosion, and is the system bled (of air) properly?

If it's all good, have the cooling system pressure tested first to be 100% sure there are no leaks.
External leaks? Fix them.
Internal leaks? (i.e. head gasket) having a Tee Kay test done will confirm this.

Pending this, could be a water pump, internally blocked radiator...
But don't throw parts at it unless you have evidence to support.

PB

 

[ivan129]

I know this is a forum for the uz family, but im stumped atm on an over heating issue. I have a 2017 tundra 5.7L , bought new maintained well having an issue with it overheating. At first it was very intermittent and random. I initatialy thought it was a sensor issue so , i swapped the temp sensor with a oem sensor from toyota.

The issue was still there, so i swapped the radiator cap , also OEM. Issue was still there. So i changed the thermostat. This one i used a murry from O'reilly. Now the issue seems worse. The temp will start to climb all the way as high normally as 250 degrees , then just as quick at climbed it falls back to normal. I dont trust the aftermarket thermostat , so i ordered a OEM one to test the waters , so we will see.

However, my opinion is it will not fix it even with a stock thermostat. Has anyone had this issue? Im going to check the clutch fan to see if it is going out. It did seem loud this winter, but maybe im just paranoid. I also checked to see if the water pump is leaking. It looks dry. I havnt found any common TSB's on overheating, or recalls .

If anyone has and information , or has experienced anything like this the help would be much appreciated

There many things you can check. You should be able to pick a coolant leak pretty easily. Most coolants are colored. Reds / pink color is usually for aluminium engines while green coolants are often used in cast iron engines. The coolant will usually leave a stain where it leaking and certainly a wet spot under the car.
Have you checked the coolant level? Do you have the correct radiator cap pressure fitted?
Have you tested the thermostat opens ok, test out of the car in boiling water?
Have you tried a forward and backward coolant flush to see if your coolant flows ok? Include any heater hoses in your flush.
Have you pressure tested the cooling system?
Have you done any modifications to the vehicle that could affect the coolant system, like fitting a trans cooler in front of the vehicle’s radiator.
Are there any signs that the engine is off / out of tune that could contribute to over-heating?
Have you tested the cooling fan is operational and not obstructed?
Have you googled? Checked with other Tundra ower’s for a similar problem.
Have you tried communicating with the dealer to see if their service department might have some clues?