Question about 2004 Mercury Mountaineer
The A/C system has a pressure switch will keep the A/C from running if the freon is low. It prevents damage to the A/C compressor from low freon.
My bet is you'll need to recharge the freon in the A/C system.
Posted on Apr 15, 2009
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Posted on Jan 02, 2017
SOURCE: Air Conditioning - blows warm
If the fuses are all ok and you can hear the aircon clutch clicking when you attempt to switch it on, then I think it may be time for a re-gas! You could do it yourself with a can of gas from an autofactors, but you wouldn't get the pressure right, and, there would still be old gas in there.
If you took it to a garage, however, they would **** out all the old gas, and then hold the vacuum in there for a while to check for any leaks. Then they would refill to the exact pressure with fresh new gas.
Posted on Jun 09, 2008
sounds like one of the mixing doors on the drivers side is stuck on the heater side. or the vacuum hose on the mixing door is off of not creating enough vacuum because of a crack in it or possibly coming off
Posted on May 27, 2009
There is a pressure sensor welded into the pipe work for the aircon with two wires coming out of it.
Unplug this and bridge the wires together when the car is running with the air con on.
If it is a faulty pressure switch you will hear the clutch on the compressor cut in and out when you touch the wires together..If this works buy a new switch..but you will have to have the car regassed.
Posted on Jun 10, 2009
SOURCE: air conditioning
This is most often caused by a defective air temperature blend door motor, this is whhat controls the temp of the air coming out the dash register vents, the actuator is deep in the dash, u must remove the entire dash assembly to replace the part.
Posted on Aug 03, 2009
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