It's great to have auto air conditioning, and of course if you are used to having it, you are not going to be too pleased if it stops working. There are many small parts in your air conditioning system that have to be in good shape in order for it to work. One of these parts is your A/C speed sensor. Many people discount this part when considering routine maintenance and checking of the air conditioner, but if your system is having problems, you may need a replacement A/C speed sensor to restore things. The A/C speed sensor monitors the engine speed and the compressor speed, and continuously checks them against each other to keep the compressor from locking down. The speed sensor relay will disengage to protect your engine in the event of overheating, and also disengages to provide extra power in some diesel engines. A replacement A/C speed sensor is necessary if yours is not working, if you want to enjoy your auto air again. Be sure to check your A/C speed sensor along with your major air conditioning components, and pick up a replacement A/C speed sensor right away if yours is not disengaging or monitoring properly. You should certainly get superb technical assistance when they buy dependable car parts. For our valued customers, we run an always-online technical support call center to answer your queries. Everybody hates to pay for shipping, that's why we always offer FREE shipping for each order $50 or more. If you spot a lower price elsewhere, let us know - we will beat any legitimate auto part price.