Replaced thermostat; gaskets where replaced; radiator flushed 2x;s; yet it continues to show on the gauge overheating. Heater does not give off heat either. There are no leaks. Hoses have also been replaced. Any thoughts?
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Re: 96 Blazer Overheating
Yes the issue is most likely an air block, jack the front of the truck up as far as you can, fill the recovery bottle and run the engine for about 10 min, then shut down and run cold water over the radiator, this should purge the air, recheck the recovery tank and refill as ness.
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Are the cooling fans working ? What are you going by to say it's overheating ? Temp .gauge . hear coolant surging in the engine , Did you replace the radiator cap. Have had a lot of customers come in saying the vehicle is overheating , it wasn't ! just bad temp gauge .
Is it ACTUALLY overheating? Check for heat at the top and bottom radiator hoses, and at both heater core hoses. If one is cold then your radiator or your heater core may be plugged and in need of a individual flush.
Check the thermostat. The temperature sender is to the right of the thermostat and if the thermostat doesn't open the hot coolant from the block won't be flowing to the sender/gauge showing it is overheating. The thermostat is at the end of the top radiator hose where it enters the engine. Check the wires to the sender to make sure they are connected. Flush the coolant and heater core at the firewall connections as it may become clogged.
I would go with slowcalafl. It is either air, or a cracked head bad head gasket. Remove the radiator cap when cool. Start up the car and watch for bubble emerging from the coolant. If it continues to bubble, you have a bad head or head gasket. If not, look for improper timing as another possibility.
I had the same problem with my 96 buick century and it was the intake gasket. The 1990's buicks all have the same problem where the gasket fails after about 100,000 miles. The radiator fluid then starts leaking in with the oil. Check your oil and make sure it is not high. If it is high, then the intake gasket is your problem. They make a special replacement gasket now that does not have the same issue. However, I doubt I'm going to keep mine another 100,000 miles so I just put in the stock gasket. Hope this helps.