No heat thermost replaced, radiator cap replaced, car does not overheat, been told heater core is fine cant locate "bleeder valve"

You may have air in the system.... Possibly a clogged heater core... Bad radiator cap. There's videos on YouTube on how to bleed system

If your engine is overheating, Try this procedure:

• Dirt and debris can get lodged in the radiator air flow paths. This can block the radiator and cause your engine to overheat and damage the engine.

• The thermostat can be stuck close. If you feel the upper hose very hot and the lower hose cooler than normal, it may be a stuck thermostat.

• Make sure the radiator and the overflow bottle are filled to the proper levels.

• Bleed air from the coolant system:This is best done by running the engine with the radiator cap off until you see when the air bubbles stop coming up.

• Check the radiator fans: The easiest way is to turn on the cars air conditioner and turn up the A/C fans. Both radiator fans should come on when the A/C starts

• Make a pressure test by using a pressure testing tool (available at most auto parts stores). Use the pressure shown on your radiator cap. Most cars are 16 PSI or less, so don't exceed that pressure. Replace the radiator cap if it doesn't hold the pressure.

I would recommend that you bleed all air out of the cooling system. The bleeder valve is located on top of the engine. Once engine starts to overheat or when you can hear bubbling back into the overflow bottle, turn car off and open bleeder valve. If you see bubbling you have air in your system. Bleed the system a couple of times and see if this helps.A heat sensor sending unit which controls activation of the electric fan could also have failed.But if the heat sensor is properly working then check the radiator cap is it properly fitted or got loose.If its loose it will release the pressure and car will overheat.But if the radiator cap is properly closed.Then its time to check the HEAD GASKET.As you have replaced the head gasket still get it checked is it overheating very quickly or is the head gasket placed properly also check the coolant level in the car. Thanks. you can rate this solution and show your appreciation.

Test your heater control valve located in heater hose

It is a small valve, looks like a wing nut located on the lower back side of your radiator. DO NOT OPEN WHILE HOT!!!!

One or more of:

1. Your coolant is low
2. Your thermostat doesn't close and needs to be replaced
3. The valve from the cooling system to the heater core is stuck
4. Your heater core is clogged

Did you replace the thermostat? If not replace it. Is the cooling fan running? If not check the fuse & thermal relay. If it has a bleeder valve it will be located on the highest part of the cooling system. It may not have one. With the engine cold remove the radiator cap. Make sure the radiator is full. Set the heater control to Hot. Start the engine and watch for escaping air bubbles. Keep the radiator full until you see no more air escaping. If it continues to overheat repeat the process.

The overheat sounds like an air pocket in the cooling system there are two bleeder screws located on top of thermostate hosing and 1 on the metal pipe just above the water pump I believe they are 7mm. with the radiator cap off and the car running slowly open 1 bleeder at a time just crack it loose until you get a steady stream of coolant make sure to keep the level in the radiator up. be carefull coolant may be hot! when you take the oil cap off you are creating a big vacuum leak thru the PCV (positive crankcase ventalation) system this is normal for this car to surge or die.

follow the hose from the radiator to the housing and inside the part the hose conects to will be the thermostate just be sure you pay attention to how it went in, if you live somewhere warm you dont even need it in there, it just helps heat the car before opening and flowing to the heater core to give the interior heat. usually its the upper radiator hose that you follow, good luck if you need a more specific guide i can look it up in mitchelondemand5 for you, thanks and pass the blue please ; )
Erik
ez automotive/U.S. Army

look for bleeder screw on thermostat housing or front middle of intake manifold area.open bleeder while vehicle running bleed air out.