I have changed the thermostat and the water pump. I checked to see if the radiator is plugged. It isn't . I've also took out the frost plug to see if corrosion was causing the antifreeze not to circulate. There was no clog. It is almost like the truck gets airlocked and the antifreeze doesn't circulate through the engine. Any suggestions would be greatly appreciated.
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Re: 2000 chev silverado 1500 overheating
Have your antifreeze mix tested to make sure it is strong (a cheap tester can be bought at any parts store) if it is ok than run the truck with the radiator cap off and see if the antifreeze cairculates when the it gets hot (this says the thermostat is opening ok). If that is ok than you might have the system pressure tested to find a leak or maybe the radiator cap is bad. Good luck
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Check for any signs of water leaking to the ground and if you do locate a leak follow the path. There could be a leak from the drain plugs, water jacket freeze plugs, water pump seals, the coolent temp switch, damaged gaskets, or a small crack somewhere in the coolent system. Check all hoses to see if they leaking or loose at clamps and connections. And if you cannot find a leak anywhere. check the radiater core or header tank, if the leak is in the radiater you should remove and replace, or have professionally repaired. Still can't find any leak. Ckeck your oil for water or foam. And if you do see that it is here, it's most likely a head gasket leak.
Blow out the radiator core from the engine side with compressed air to get rid of bugs and other debris. Check the fan clutch if mechanical drive. If electric fan, make sure fan(s) come on when hot. You may have combustion products entering the cooling system. Check with auto parts supplier for test kit for same or check with a well equipped shop for a similar test. Make sure that both radiator hoses are not obstructed internally. Hope some of this helps!
On a 5.3L engine follow the lower radiator hose to the water pump... there is an elbow with 2 bolts... the thermostat should be located under that.... just below your serpentine belt tensioner... this confuses people because normally and engine has the thermostat on the top radiator hose
Based on your description "hard line from thermastat area has a heat wraparound it goes towards firewall", that would appear to be part of the heater system for the inside of the vehicle and would not affect the overheating of the engine.
Most engine overheating could be caused by:
insufficient coolant in the radiator or reservoir;
defective (stuck) thermostat;
too soft radiator hoses (upper/lower);
water pump, belt, tensioner;
radiator fan motor, clutch (if has got one), relay.
Additionally, in a large number of vehicles, the radiator fan motor would only work theA/C or heater is ON.
Corrective action would require determining which is the culprit, pls try:
remove the thermostat completely out and test drive, see if the overheating comes back, if yes, then it is not the thermostat, if no then the thermostat most likely is stuck closed and would need replacement;
on start from a cold engine, remove the radiator cap and pls check if the water flows when the engine is revved. If yes, water pump is working, if not, water pump is defective;
in a closed loop cooling system such as in your car, there is a possibility that the radiator hoses might have thinned down or gotten softer. This could be checked by revving the engine while looking over the hoses, there should be apparent sagging or reduction in diameter when the engine is revved. If any, then they are too soft and would need replacement;
clogged radiators could be flushed/cleaned by removing the drain plug at the bottom.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
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