It is coming on with the ac and defrost. it comes on and shuts off every few seconds. Does this mean my compressor is no good Or can I just tighten something. this happened 1 day after I fix my heater core is that just a Coinsidence? Can it hurt my car if I drive like that Without using the ac? Here is a link to a video of the problem http://www.youtube.com/watch?feature...&v=1G5CIg2WJLI