99 Chevy Silverado is overheating after maintance on radiator
99 Chevy Silverado Truck is overheating after simply changing coolant. As maintance we drained and refilled the radiator. Next morning truck overheated. We have now changed the thermostat with a new one, still overheats. Went without a thermostat and it still overheats. The water in the resievor is boiling hot. Also no heat is coming out of the heater vents. Any ideas what could be wrong?
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I would run radiator cleaner thru truck several times till water is clear and fill with correct ratio of antifreeze/water. Check oil if milky you have a cracked head or head gasket . clutch fan may not be engaging radiator old or incorrect for truck Semper Fi!
If the Check Engine light is coming on the computer is storing a code to let you know what the problem is. Have your computer scanned and you will probably find out what the problem is. The temperature gauge cannot work properly if the cooling system is leaking. The sending unit has to be in the coolant to work. If the coolant is low, the sending unit will not be in the coolant. If the coolant is leaking from around the radiator there has to be a radiator, radiator cap, or radiator hose leak.
Flushing the radiator, replacing the radiator cap, adding new coolant, replacing the sensors and a new thermostat solved the problem. Probably didn't need to do all of these things - but since we just purchased the truck, and given the fact that is probably hadn't been done in a while, we chose to do all of these things (which really didn't cost a whole lot), it's running like a charm now.
After replacing the thermostat, you must bleed the air from the cooling system.
To bleed air from the 2.2L and 2.5L engines, remove the plug or sensor
on the top of the thermostat housing. Fill the radiator with coolant
until the coolant comes out the hole. Since the plug is made out of
steel and the thermostat housing is aluminum, it is a good idea to
apply an anti-seizing compound or Teflon® tape on the plug threads
prior to installation. Install the plug and continue to fill the
radiator. This will vent all trapped air from the engine.
Any trapped air in the heating system will have to be displaced by coolant. Once the cooling system is filled, with the radiator cap off, turn of the heater at it's highest setting. Start the engine and allow it to reach operating temp. You should see a drop in the coolant level as the air in the heating system is displaced by coolant. Add coolant to the proper level and replace the radiator cap.
Keep a close eye on the coolant level for at least the next couple of weeks. The cooling system is a "closed" system. Any significant decrease in coolant level indicates a problem.