ok so i just replaced my heater core cause i wasnt getting heat. now when i drive my car takes forever to heat up (engine) and once it does it drops back down. then heats back up ect the guy that fixed it said that there will be air pockets in the cooling system until i work them out, could this be it??also i only get really hot heat when i am idle and keep the rpms up. soon as i let go of gas the heat cools back down.
he may not have bled the air out of the cooling system, also it is possible that the coolant shut off valve sometimes located in the cooling line that runs to the heater core is partially stuck closed and is not opening uip all the way,, or the air vacuum line runnin to the heater coolant shut of valve is bad and leaking vacuum so the valve keeps shutting off coolant to the heater core,, Art,, on oter thing, make sure u have the correct thermostat in the engine, you do if the engine heats up to at least 190 degreees,
placed the vehicle in park and permit it run. turn the a/c on and make certain the radiator fan is working. each and every each and every now and then while your fan is going out, your engine will run cool on a similar time as the vehicle is moving, yet gets warm while basically idling. There are in basic terms a magnificent style of issues that could flow incorrect while it is composed of your engine staying cool. If there's no water, it must be your radiator,water-pump, freeze plugs, or hose leaking. in case you have water and it is overheating, it must be your fan is going out, or your thermostat. This covers ninety 9% of maximum coolant gadget issues human beings come upon.
Sounds like a bad thermostat but i bet its not it's gonna be the air pockets just open the radiator cap when cold start engine till warms up you should see water level drop when the thermostat opens this means the air came out and the now you can top it off real fast before replacing the cap. If this don't work try the same thing with the front end of the car lifted up more then the back then the air has no choice but to rise out. Some vehicles have an air pocket bleeder screw usually located at the thermostat housing.
