Question about 2008 Mercury Milan
First the cooling fan quit working then the AC compressor would not turn on. I checked all fuses, they are good.
The cooling fan is controlled by sensors in the cooling system so providing that you can move the fan blades easily and you have current getting to them I would be having a code reading to check for failing sensors. As to the a/c problem the compressor operation is controlled by 3 switches 1 switch is the heater fan must be on as well as the ac switch --2 is a switch that turns the compressor off if the head pressure is excessive and 3 is a low pressure switch that turns the compressor off if the pressure is too low (no gas). have a ac mechanic check out the system for leaks
Posted on Jul 14, 2013
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Posted on Jan 02, 2017
SOURCE: i have two cooling fans
it could be the sensor on the radiator , it shall give el power to the fan. It are a temperature switch so open and closed after the temprature on the engine. you shall find it on the radiator. takke of the plug and try to put a conection over they two wires in the plugg. If the fan start it are the sensor , you can check if the are 12 v in the plug.
Hoppe you understand what i mean
Posted on Dec 04, 2008
SOURCE: a/c not operating
Mine had the same problem and fixed it by changing the dash A/C unit, the whole part that's above the radio, mine has the electronic one and was not sending signal to engine fan and A/C compressor.
Posted on Jul 23, 2009
If the fuse is ok, and you are getting no power to the compressor, then it's possible that the a/c switch in the dash is bad or loose, or it's possible that there is a problem elsewhere in the circuit.
As a test, try wiring the compressor directly to the battery to see if it comes on. If this checks out ok, then pull the switch from the dash and test it. If the switch is ok, you will need a circuit diagram to track down the problem in the circuit.
PS. Just in case you didn't know this, if the refrigerant pressure in the system is too low, the compressor will not come on. Sometimes this is mistaken as a sign that the compressor or circuit are bad. Make sure that your system has a sufficient load of refrigerant. You can get an inexpensive R-134 pressure gauge included in a recharge kit from most discount stores or auto parts stores.
Posted on Mar 22, 2010
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