I drive a 2005 Hyundai Elantra. I have had this same issue before. Here is my best description of what is happening. As I am driving if I am going below about 35 mph or am stopped in traffic the temperature gauge on my car starts rising until it is in the red zone. At the same time it kicks off my air conditioning or my heat, which ever I am running. Once I start moving again and get to above 35 mph my ac or heat will come back on and when it does immediately my temperature gauge will drop back down to below the half way point. Not only is this a pain because I can’t stay cool or warm inside my car but I am really starting to worry about my engine overheating.
This same thing happened last spring. At the time I needed an oil change and when I picked my car up the gentlemen that did the oil change told me my antifreeze was low so he had refilled it. I’m not sure if he did anything else like flushed it out. However I quickly noticed afterwards my air conditioning no longer gave me problems and my temperature gauge stopped rising as well.
Therefore this time when this started the first thing I did was add antifreeze to my car. I was able to see when I did that that it wasn’t up to the fill line so I am guessing it was low. However when getting in my car today I noticed it didn’t seem to fix the problem, the ac is still kicking off and my temperature gauge is still rising. What should be the next thing I look into? I am far from a mechanic so if needed I will get it checked out however if there is something I can do first to perhaps fix or identify the problem on my own I would like to give it a try since money is a bit tight at the moment. Any ideas on what the problem could be or what I should do?