Hi! I'm too new for this forum so, I have a problem for my car. You see, my A/C will getting cold while I'm driving, so when I stop at the red light or something, my A/C will getting warm instead of cold. So, I want to fix my car or I will be not happy with hot weather Any suggestion?

Here is the list that I already did.
1) Replace my fuse.

 

Welcome to the forum..
What year is your vehicle? engine size?
did you replace the fuse because it was bad? which fuse?
Some items to check are that the cooling fan for the engine is coming on when the AC is on.
Have the AC charged checked at a reputable shop
The thermostat for the engine needs to be operating correctly, if the engine over heats it will also cause the AC to stop working correctly..

 

What year is your vehicle? Chevy Cobalt LT 2007
engine size? 2.2L 4-Cyl
did you replace the fuse because it was bad? which fuse? yep and it is A/C clutch's fuse
Have the AC charged checked at a reputable shop - well, my father did check my car's refrigerant level and it's normal.
The thermostat for the engine needs to be operating correctly, if the engine over heats it will also cause the AC to stop working correctly..how I can check that?

 

Is the clutch engaged at idle?

 

I don't know because I am deaf so I can't hear. (

 

You can look at it, if the pully is freewheeling then it isn't engaged, if the end is turning, then it is.

 

right now, my father using my car so I can give you a story so you probably can figure it out.

After stop at the red light, I can feel a lot vibrate for a minute or two and then, I feel nothing but little vibrate also my AC become warm instead of cold.

 

If the fuse was blown once and now you feel a lot of vibration, I suspect there may be an issue with the compressor, I would advise you take it to a professional AC service for check out and inspection...

 

low on refridgerant my chev does the same

 

refridgerant is low. go get it recharged go to a dealer