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Check to coolant level after it cools off and check to see if coolant-water mixture is correct. If those are ok. You could have to much air in the coolant system. Most radiator caps will automatically vent the air out of the coolant system. It could be as simple as a coolant cap that gone bad. Or you may have a air bleed valve on it and you need to bleed the air out manually. To bleed it you will have to crank engine and get it warm. Touch top radiator hose to see if its warm. If not then the thermostat has not opened yet. That could also be the problem. After it gets warm open the bleeder valve if equipped and bleed all the air out. Once the steam and hot air from the valve starts to be gone and pure coolant coming from the valve. You have successfully bleed the coolant system. Cool engine back off and check coolant level once more. Hope this helps.
Make sure the electric radiator fan is going on at appropriate temperatures to cool the coolant down in the radiator. Make sure it's connected up and so on and so forth. Sometimes, sediment builds up in the coolant passages, causing the overheating to occur. Consider having it flushed out and replaced the coolant with a 50/50 mixture of antifreeze to water. If pure antifreeze was used, instead of a 50/50 mixture, it can cause an overheat condition to occur as well.
Check your coolant level, more then likely low, check coolant level with engine off and cold. not enough coolant will not circula through out the cooling system at idle, till you give it gas then water pump turns faster and pushes water through out system,
Hello the bravada and the s10 blazer are bad about the heater cores air locking or either stopping up. Disconnect the heater hoses at the firewall and run a water hose to the inlet then try the outlet until the water is clear of debris then reconnect and refill with coolant remember 50/50 coolant water. Pure coolant will freeze and so will pure water. Thank you