My car just hit 70,000 miles. I have service due in a few days. I am planning on holding the timing belt/water pump to the 80,000 miles service. My car has been running perfectly for quite some time now. A couple of days ago, I turned on my car in the morning (a usual day) and let it sit there for 10 mins while I was getting ready to leave for work. I do this everyday in wintertime, turn on the ignition and let the car and the engine heat up before I start driving.
So when I came back in to the car after 10 mins, I realized that the inside was heated enough. Its a regular routine for me so I know exactly what me car feels like after 10 mins. I drove off to work, everything seemed fine. Same thing happened in the evening. No heating during idle, but the car got warm enough while driving. I can easily conclude that the heat is definately not working when the car is sitting idle. I could set the temprature to HI and still nothing. If I rev the engine up to 3-4k while the car is in neutral, I can feel the heating coming from the blowers, but when I let go, it slowly becomes cool again.
Can someone please tell me what could be going on? I run the car stock pretty much and when weird things happen out of no where, it just really ticks me off. Any help is much appreciated. Thank you.