1994 camaro, i have no heat and about 5 min into the drive the car starts to over heat. when i check i still have radiator fluid filled, replaced radiator about a year and half ago, haven't replaced the thermostat. would that be my best bet?
You may have an Air lock in the radiator. all you gotta do is run the car without the rad cap on and put coolant in while its running, also try massaging the hose (not intended to be dirty) to get the remaining air out.
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you have air in the system ,if you have not done a radiator clean ,the put radiator flush in the radiator then go for a short run.about 5 miles then go back and drain the radiator.now remove both radiator hoses.fill with water it will pour out as you do so..if clear refit you hoses.fill will a 50/50 mix of antifreeze. now put your heating on full open your window .with your expansion bottle cap off ,run your engine on tick over till the water starts to head up.then refit the cap.this is done to bleed the air out both in your heater core .and the radiator.
It could be the radiator fan motor if all sensors and relays have been changed.......unplug the coolant temperature sensor the fan should come on and stay on unless the motor is bad or it is not getting electrical current.
I think the engine is running too hot. First I would change the thermostat, and if the problem is still there, check the water pump for circulation, and make sure the rad is good. Also make sure there is no blockage in the hoses, and that the fan is working good. Want to be careful, overheating will cost you head gaskets, and possibly more.