2007 Mercury Milan Premier V6 ac compressor clutch won't engage. Fuses and relays are ok. Pressure switch checks out ok. What could cause the problem?

you may need to top up the coolant,r112,r140or what ever the car is useing. if the car can'nt be topped up then you have a leak that needs to be fixed,usually the drier. you may need to top up the coolant,r112,r140or what ever the car is useing. if the car can'nt be topped up then you have a leak that needs to be fixed,usually the drier.

Your A/C temperature sensor switch is bad (Evap Temp Sensor Motorcraft Part #- YH-1662). This sensor sends the signal to turn on cold air. If this part is faulty, your car will sense it is -40 degrees and WILL NOT kick out cold air. To confirm this, bypass the relay with the compressor clutch. Do you get cold air? However, this is ONLY SAFE TO TEST. DO NOT DRIVE WITH THIS JUMPED!! The part is a lousy $25.00 but the dealer will charge upwards of $1200 due to the fact the part is literally in the middle of the dashboard, which means you need to have the dash removed. However, if you have 6+ hours to spare (I assume you want to save the $), then check out this video. Its for a Ford Fusion, but as you know, the Fusion, and Milan are the same car. I changed my 2007 Milan A/C switch based off of this video, and now have ICE COLD AIR! The video gives you all the socket sizes, etc...that you will need in order to perform this task. The vid is only 23 or so minutes long. BUT DON"T BE FOOLED. THIS IS NOT A 23 minute job, but is worth the $ you'll save. Again, the part number is YH-1662 (Evap Temp Sensor Switch by Motorcraft). Here is the link to the video: Your A/C temperature sensor switch is bad (Evap Temp Sensor Motorcraft Part #- YH-1662). This sensor sends the signal to turn on cold air. If this part is faulty, your car will sense it is -40 degrees and WILL NOT kick out cold air. To confirm this, bypass the relay with the compressor clutch. Do you get cold air? However, this is ONLY SAFE TO TEST. DO NOT DRIVE WITH THIS JUMPED!! The part is a lousy $25.00 but the dealer will charge upwards of $1200 due to the fact the part is literally in the middle of the dashboard, which means you need to have the dash removed. However, if you have 6+ hours to spare (I assume you want to save the $), then check out this video. Its for a Ford Fusion, but as you know, the Fusion, and Milan are the same car. I changed my 2007 Milan A/C switch based off of this video, and now have ICE COLD AIR! The video gives you all the socket sizes, etc...that you will need in order to perform this task. The vid is only 23 or so minutes long. BUT DON"T BE FOOLED. THIS IS NOT A 23 minute job, but is worth the $ you'll save. Again, the part number is YH-1662 (Evap Temp Sensor Switch by Motorcraft). Here is the link to the video: