- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
I suggest having the cooling system checked for trapped air not allowing proper coolant circulation; have it checked for a possible head gasket failure, this can sometimes be noted by observing a "perculating" in the radiator when the engine is running with the cap off. Steam coming from the tailpipe on a previously warmed engine or the apperance of "milky " looking oil on the dipstick.
When you top off the radiator you fill it to the neck where the cap goes. When the engine heats up the antifreeze eventually will distribute and the excess will go into the overflow bottle.
After the car cools, it will draw the antifreeze from the overflow tank into the radiator. Then check the level line on the overflow bottle(tank) for the normal amount of antifreeze per marks on the bottle.
You should have your radiator cap checked for its pressure rating. Use the type of cap which allows for an overflow system. The older caps would not let the antifreeze flow both ways.
sounds like you may have air in the system. i know you said you don't but i'd double check that. Also when idleing there is no load on the engine, so the system doesn't have to work very hard to keep up and the keep the engine cool. Check the operation of your water pump. A faulty water pump can sometimes keep up at low rpms but not under load. However the heat not working, still leans towards air in the system.
P0301 represents cylinder number 1. The most likely cause is the coil boot that attaches on the bottom of the coil. Typically they crack from heat. The other concern could be the coil itself. If you find the boot cracked then replace all of them, they are available at most parts stores and it is good insurance. If you have more questions feel free to leave me a message in my profile, thanks.