Today the truck was idiling in the driveway while i was dis connecting the boat and it overheated ? I checked all the belts and the pulleys are all turning oil is good water is good.....truck has 75000 miles could it be just a thermostat?
2004 sierra 2500 overheating
- Thread starter scott h
- Start date
Molson02536
New member
Start with the simple and replace the Thermostat and also the coolant. You have the Dex-Cool in there and they have a life span of 5 years or 100,000 miles.
Best to do is to use Preston Radiator Flush to clean out the cooling system and then replace the coolant with a 50/50 mix of water and Dex-Cool. This sill ensure another 5 years of service, I my self service mine no longer then 3 years and i use the Fail Safe Thermostat which will lock open when there is any overheating issues.
Good luck and keep us posted.
Molson02536
New member
The fail safe thermostat is about $4.00 to $5.00 more then the conventional one's which is worth the cost. If there is any issues, you can still keep driving the Sierra till your replace it.
Good luck and keep us posted.
Well disregaurd that last question. I figured it out but im oretty sure the water pump is bad heater hoses are both the same temp,engine is still warming quickly after stat replaced and radiator flushed and not hot air from the heater what so ever.Wrench time.
Molson02536
New member
Sorry for the bad news, when you replace the water pump. Use water first in the system to find any leaks first, that way if there is any leaks. It's just water that you are draining to address any water leak issues.
Once you are sure that there are no leaks, then drain the water and replace it with Radiator coolant. Keep up the great work and keep us posted.